(112, '', 'J', 'PRIETO, C;CASTANER, R;DEANDRES, A;MARTINEZ, JL;', 'PRIETO, C; CASTANER, R; DEANDRES, A; MARTINEZ, JL', '', '', '', '', 'STRUCTURAL FEATURES OF METALLIC SUPERLATTICES AND MULTILAYERS STUDIED BY X-RAY-ABSORPTION SPECTROSCOPY', 'PHYSICA B', '', '', 'English', 'Article; Procee', '8th International Conference on X-Ray Absorption Fine Structure (XAFS VIII)', 'AUG 28-SEP', 'BERLIN, GERMANY', 'BESSY, FRITZ HABER INST, HAHN MEITNER INST BERLIN', 'FREIE UNIV BERLIN', '', 'X-ray absorption spectroscopy has been used to determine crystallographic characteristics of several heterostructures: the distortion of the FCC structure of Co layers in Co/Cu, the structure of sputtered Co/Cu multilayers and the atomic volume of Fe layers in Fe/Ru superlattices. This letter remarks the relation between structure and magnetic and elastic properties.', '', 'PRIETO, C (reprint author), CSIC, INST CIENCIA MAT, CIENCIAS C-4, CANTOBLANCO, E-28049 MADRID, SPAIN.', '', '', '', 'BAUDELET F, 1993, PHYS REV B, V47, P2344, DOI 10.1103/PhysRevB.47.2344; CASTANER R, 1984, J PHYS-CONDENS MAT, V6, P4881; CEBOLLADA A, 1989, PHYS REV B', '12', 0, 0, 'ELSEVIER SCIENCE BV', 'AMSTERDAM', 'PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS', '0921-4526', '', 'PHYSICA B', 'Physica B', 'MAR', '1995', '208', '1-4', '', '', '', '617', '618', '', '10.1016/0921-4526(94)00880-5', '', '2', '', 'Physi', 'Physi', 'QP961', 'WOS:A', 0, 0),
(113, '', 'J', 'MARTINEZ, JL;PRIETO, C;RODRIGUEZCARVAJAL, J;DEANDRES, A;VALLETREGI, M;GONZALEZCALBET, JM;', 'MARTINEZ, JL; PRIETO, C; RODRIGUEZCARVAJAL, J; DEANDRES, A; VALLETREGI, M; GONZALEZCALBET, JM', '', '', '', '', 'STRUCTURAL AND MAGNETIC-PROPERTIES OF SR2RUO4-TYPE OXIDES', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', 'English', 'Article; Procee', 'International Conference on Magnetism - ICM 94 (13th IUPAP Triennial Conference on Magnetism)', 'AUG 22-26,', 'WARSAW, POLAND', 'INT UNION PURE & APPL PHYS', '', '', 'We have studied the structure and magnetic properties of the Sr2-xCaxRuO4 oxides, as well as those of the main perovskite precursors, i.e. Sr2RuO3 and CaRuO3. The Sr2RuO4 compound presents a tetragonal structure (a approximate to 3.9 Angstrom, c approximate to 12.7 Angstrom, space group 14/mmm) isomorphous to the prototype K2NiF4. SrRuO3 shows a ferromagnetic transition at T-C approximate to 170 K. The magnetic susceptibility of CaRuO3 seems to indicate an antiferromagnetic behavior, with a clear deviation from the Curie-Weiss law below similar to 70 K. However, neutron diffraction data at 1.5 K preclude the existence of long range antiferromagnetic ordering in CaRuO3. The magnetic behaviour of Sr2RuO4 indicates a very weak dependence on temperature of the magnetic susceptibility, close to a Pauli paramagnet.', 'CENS,CEA,LAB LEON BRILLOUIN,CNRS,F-91191 GIF SUR YVETTE,FRANCE; UNIV COMPLUTENSE MADRID,FAC FARM,DEPT QUIM INORGAN & BIOINORGAN,E-28040 MADRID,SPAIN; ', 'MARTINEZ, JL (reprint author), CSIC,INST CIENCIA MAT,FAC CIENCIAS C4,E-28049 MADRID,SPAIN.', '', '', '', 'BENSCH W, 1990, SOLID STATE IONICS, V43, P171, DOI 10.1016/0167-2738(90)90481-6; CALLAGHA.A, 1966, INORG CHEM, V5, P1572, DOI 10.1021/ic50043a023; CAT', '6', 16, 17, 'ELSEVIER SCIENCE BV', 'AMSTERDAM', 'PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS', '0304-8853', '', 'J MAGN MAG', 'J. Magn. M', 'FEB', '1995', '140', '', '', '1', '', '179', '180', '', '10.1016/0304-8853(94)01245-8', '', '2', '', 'Mater', 'Mater', 'QL736', 'WOS:A', 0, 0),
(114, '', 'J', 'MARTINEZ, JL;FERNANDEZDIAZ, MT;CHEN, Q;PRIETO, C;DEANDRES, A;SAEZPUCHE, R;ROMERO, J;', 'MARTINEZ, JL; FERNANDEZDIAZ, MT; CHEN, Q; PRIETO, C; DEANDRES, A; SAEZPUCHE, R; ROMERO, J', '', '', '', '', 'BULK MAGNETIC CHARACTERIZATION OF RCACRO(4) (R=Y, PR, SM) OXIDES', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', 'English', 'Article; Procee', 'International Conference on Magnetism - ICM 94 (13th IUPAP Triennial Conference on Magnetism)', 'AUG 22-26,', 'WARSAW, POLAND', 'INT UNION PURE & APPL PHYS', '', '', 'The system RCaCrO(4) (R = Y, Sm, Pr) presents an orthorhombic structure (space group Bmab) at room temperature (RT), similar to that observed in La(2)MO(4) (M = Cu, Ni, Co). The magnetic susceptibility for RCaCrO(4) shows a weak temperature dependence down to 250 K, probably due to the antiferromagnetic ordering of the Cr sublattice above RT. Below RT there is a strong upturn anomaly at 210, 190 and 130 K for Pr, Sm and Y, respectively. This anomaly is associated with the appearance of a weak ferromagnetic component, and could be related to a low temperature structural phase transition, similar to that observed in the related compounds R(2)NiO(4) or La1.88Ba0.12CuO4. In the case of YCaCrO4 this ferromagnetic component produces a hysteresis curve at 4.5 K with a coercive field of 0.7 T. For PrCaCrO4 the coercive field is very small (< 0.05 T). SmCaCrO4 shows a more complicated behavior with a low temperature magnetic transition (T(N2)approximate to 40 K), which could be associated with either the antiferromagnetic ordering of the Sm sublattice or a spin reorientation in the Cr sublattice.', 'UNIV COMPLUTENSE MADRID,FAC CIENCIAS QUIM,DEPT QUIM INORGAN,E-28040 MADRID,SPAIN', 'MARTINEZ, JL (reprint author), CSIC,FAC CIENCIAS C4,INST CIENCIA MAT MADRID,PLAZA MURILLO 2,E-28049 MADRID,SPAIN.', '', '', '', 'BERJOAN R, 1982, J SOLID STATE CHEM, V42, P75, DOI 10.1016/0022-4596(82)90417-0; CHAUMONT C, 1980, Z ANORG ALLG CHEM, V470, P18, DOI 10.1002/zaac.1980', '6', 2, 2, 'ELSEVIER SCIENCE BV', 'AMSTERDAM', 'PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS', '0304-8853', '', 'J MAGN MAG', 'J. Magn. M', 'FEB', '1995', '140', '', '', '2', '', '1179', '1180', '', '10.1016/0304-8853(94)01290-3', '', '2', '', 'Mater', 'Mater', 'QM074', 'WOS:A', 0, 0),
(115, '', 'J', 'PRIETO, C;DEANDRES, A;MARTINEZ, JL;', 'PRIETO, C; DEANDRES, A; MARTINEZ, JL', '', '', '', '', 'ELASTIC AND STRUCTURAL-PROPERTIES OF HEXAGONAL FE/RU SUPERLATTICES', 'PHYSICA STATUS SOLIDI A-APPLIED RESEARCH', '', '', 'English', 'Article', '', '', '', '', '', '', 'Brillouin scattering (BS) and X-ray absorption spectroscopy (XAS) measurements are performed on hexagonal Fe-x/Ru-y superlattices, where the iron layers adopt a hexagonal structure for thicknesses smaller than 1.4 nm. The aim of these experiments is to study the elastic properties of such a kind of superlattices and their relationship with the structure and atomic environment of the iron atoms. A clear discontinuity of 20% is observed in the surface sound velocity for Fe-12/Ru-6, this value is similar to that found in other superlattice systems. The analysis of the XAS measurements shows that there are no appreciable changes in the structure, therefore, the anomaly in the elastic constants cannot be explained as a modification in the microstructure of the layers.', '', 'PRIETO, C (reprint author), CSIC,FAC CIENCIAS C4,INST CIENCIAS MAT,E-28049 MADRID,SPAIN.', '', '', '', 'BAUDELET F, 1993, PHYS REV B, V47, P2344, DOI 10.1103/PhysRevB.47.2344; CASTANER R, 1994, J PHYS-CONDENS MAT, V6, P4981, DOI 10.1088/0953-8984/6/27/00', '18', 3, 3, 'AKADEMIE VERLAG GMBH', 'BERLIN', 'MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY', '0031-8965', '', 'PHYS STATU', 'Phys. Stat', 'DEC', '1994', '146', '2', '', '', '', '613', '620', '', '10.1002/pssa.2211460206', '', '8', '', 'Mater', 'Mater', 'QA813', 'WOS:A', 0, 0),
(116, '', 'J', 'TABOADA, S;DEANDRES, A;SANTIUSTE, JEM;PRIETO, C;MARTINEZ, JL;CRIADO, A;', 'TABOADA, S; DEANDRES, A; SANTIUSTE, JEM; PRIETO, C; MARTINEZ, JL; CRIADO, A', '', '', '', '', 'OPTICAL PHONONS, CRYSTAL-FIELD TRANSITIONS, AND EUROPIUM LUMINESCENCE-EXCITATION PROCESSES IN EU2BACOO5 - EXPERIMENT AND THEORY', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'The europium compound Eu2BaCoO5 has been studied by means of Raman and x-ray absorption spectroscopies. The eigenfunctions and frequencies of the optical normal modes have been calculated from an adequate potential showing good accordance with the observed phonons. In addition to Raman allowed normal modes, several infrared and luminescence bands are observed between 10 K and 300 K. The temperature dependence of these processes has allowed us to determine the complex interrelation between these two kinds of elementary excitations. A broad luminescence band (at 2.3 eV) is tentatively attributed to electronic transitions between Co2+ 3d crystal field levels in the gap of the material. The mixing of these quasiatomic levels with apical oxygen orbitals, along the very short Co-O(2) bonds in the chains, can be the reason for the simultaneous enhancement of the intensities of the luminescence band and of the apical oxygen infrared modes through a resonant electron-phonon coupling. From the dependence of the phonon frequencies and the analysis of the extended x-ray-absorption fine structure spectra with the temperature it can be concluded that on decreasing the temperature the a-xis becomes shorter, while the other two axes remain nearly unchanged. The emission spectrum in the visible range has been observed and interpreted in the frame of the crystal-field theory. We have studied the dependence of the intensity of the electronic transitions between 4f levels of the europium ions with the temperature and the energy of the exciting light. From the behavior of the Eu3+ luminescence peaks it has been possible to determine the processes of excitation and emission, which are shown to involve lattice phonons. The crystal-field parameters of the Eu3+ ions have been calculated from the energies of the lower terms of the ion.', 'UNIV CARLOS 3,ESCUELA POLITECN SUPER,E-28913 MADRID,SPAIN; UNIV SEVILLA,DEPT FIS MAT CONDENSADA,INST CIENCIA MAT SEVILLA,E-41080 SEVILLE,SPAIN', 'TABOADA, S (reprint author), CSIC,FAC CIENCIAS,INST CIENCIA MAT MADRID,C-4,E-28049 MADRID,SPAIN.', '', '', '', 'ALONSO JA, 1990, SOLID STATE COMMUN, V76, P467, DOI 10.1016/0038-1098(90)90651-Q; ARIZMENDI L, 1985, PHYS REV B, V31, P7187; Born M., 1954, DYNAMICAL ', '34', 18, 19, 'AMERICAN PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '0163-1829', '', 'PHYS REV B', 'Phys. Rev.', 'OCT 1', '1994', '50', '13', '', '', '', '9157', '9168', '', '10.1103/PhysRevB.50.9157', '', '12', '', 'Physi', 'Physi', 'PL412', 'WOS:A', 0, 0),
(117, '', 'J', 'CASTANER, R;PRIETO, C;DEANDRES, A;MARTINEZ, JL;SAEZPUCHE, R;', 'CASTANER, R; PRIETO, C; DEANDRES, A; MARTINEZ, JL; SAEZPUCHE, R', '', '', '', '', 'X-RAY-ABSORPTION SPECTROSCOPY AND MAGNETIZATION STUDY OF THE Y2-XCAXBANIO5 OXIDES', 'JOURNAL OF ALLOYS AND COMPOUNDS', '', '', 'English', 'Article', '', '', '', '', '', '', 'X-Ray absorption near-edge structure and extended X-ray absorption fine structure spectroscopies have been used to study the electronic and structural properties of Ca-doped Y2BaNiO5. The increase in the Ni formal oxidation state associated with the Ca content has been probed. This effect gives rise to a shortening of the Ni-O distances along the main axes of the NiO6 octahedra. The magnetic behaviour has been measured in both pure and Ca-doped samples. The system shows how the one-dimensional antiferromagnetic correlations are lost for Ca-doping values as low as 10%.', 'UNIV COMPLUTENSE MADRID,FAC CIENCIAS QUIM,DEPT QUIM INORGAN,E-28040 MADRID,SPAIN', 'CASTANER, R (reprint author), CSIC,FAC CIENCIAS CIV,INST CIENCIA MAT MADRID,CANTOBLANCO,E-28049 MADRID,SPAIN.', '', '', '', 'ALONSO JA, IN PRESS J SOLID STA; BONIN D, 1992, 8TH P EPS SCH CHEM P; GARCIAMATRES E, 1993, J SOLID STATE CHEM, V103, P322, DOI 10.1006/jssc.1993.1107', '13', 3, 3, 'ELSEVIER SCIENCE SA LAUSANNE', 'LAUSANNE 1', 'PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND', '0925-8388', '', 'J ALLOY CO', 'J. Alloy. ', 'AUG', '1994', '210', '1-2', '', '', '', '31', '35', '', '10.1016/0925-8388(94)90111-2', '', '5', '', 'Chemi', 'Chemi', 'PA713', 'WOS:A', 0, 0),
(118, '', 'J', 'CASTANER, R;PRIETO, C;DEANDRES, A;MARTINEZ, JL;MARTINEZALBERTOS, JL;OCAL, C;MIRANDA, R;', 'CASTANER, R; PRIETO, C; DEANDRES, A; MARTINEZ, JL; MARTINEZALBERTOS, JL; OCAL, C; MIRANDA, R', '', '', '', '', 'THE STRUCTURAL CHARACTERIZATION OF CO-CU(100) SUPERLATTICES BY X-RAY-ABSORPTION SPECTROSCOPY', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', 'English', 'Article', '', '', '', '', '', '', 'Extended x-ray absorption fine structure has been used to determine a crystallographic distortion in the Co layers in Co-Cu single-crystal superlattices grown on Cu(100). The FCC structure of the superlattice imposed by the Cu substrate is distorted along the growing direction for the Co layers, which am compressed perpendicularly to the interfaces. They adopt the in-plane lattice constant of the Cu substrate, keeping constant the atomic volume of Co (11.30 angstrom3/atom), close to the value for HCP-Co.', 'UNIV AUTONOMA MADRID,DEPT FIS MAT CONDENSADA CIII,E-28049 MADRID,SPAIN', 'CASTANER, R (reprint author), UNIV AUTONOMA MADRID,FAC CIENCIAS CIV,CONSEJO SUPER INVEST CIENTIFICAS,INST CIENCIA MAT,E-28049 MADRID,SPAIN.', '', '', '', 'BAIBICH MN, 1988, PHYS REV LETT, V61, P2472, DOI 10.1103/PhysRevLett.61.2472; BOHER P, 1992, J APPL PHYS, V71, P1798, DOI 10.1063/1.351185; BONIN D, 1', '29', 11, 11, 'IOP PUBLISHING LTD', 'BRISTOL', 'TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX', '0953-8984', '', 'J PHYS-CON', 'J. Phys.-C', 'JUL 4', '1994', '6', '27', '', '', '', '4981', '4990', '', '10.1088/0953-8984/6/27/007', '', '10', '', 'Physi', 'Physi', 'NV904', 'WOS:A', 0, 0),
(119, '', 'J', 'CRIADO, A;BERMEJO, FJ;DEANDRES, A;MARTINEZ, JL;', 'CRIADO, A; BERMEJO, FJ; DEANDRES, A; MARTINEZ, JL', '', '', '', '', 'MICROSCOPIC DYNAMICS OF ORTHO-TERPHENYL IN ITS POLYCRYSTALLINE AND GLASSY FORMS', 'MOLECULAR PHYSICS', '', '', 'English', 'Article', '', '', '', '', '', '', 'The microscopic dynamics of polycrystalline ortho-terphenyl are investigated by means of the concurrent use of harmonic lattice dynamics calculations and Raman spectroscopy. In order to reproduce the spectra and thermodynamics of the crystal up to about 70 K, the motions of several internal modes are considered in detail. An empirical force field, able to account for the observed crystal structure, thermodynamics and Raman spectra up to such temperature, is then developed. Estimates of the anharmonic effects are derived from the temperature dependence of vibrational frequencies of those modes of collective or hybrid character (below 6 THz). The Raman spectra of the glass are finally discussed by comparison with the polycrystalline case. The implications of the present findings regarding studies on the glass transition of complex materials are discussed.', 'CSIC,INST ESTRUCTURA MAT,E-28006 MADRID,SPAIN; UNIV AUTONOMA MADRID,CSIC,INST CIENCIA MAT,E-28049 MADRID,SPAIN; UNIV SEVILLA,DEPT FIS MAT CONDENSADA,E', 'CRIADO, A (reprint author), UNIV SEVILLA,CONSEJO SUPER INVEST CIENT,INST CIENCIA MAT,POB 1065,E-41080 SEVILLE,SPAIN.', '', '', '', 'ANDREWS JN, 1955, PROC R SOC LON SER-A, V228, P435, DOI 10.1098/rspa.1955.0059; BARTSCH E, 1993, CHEM PHYS, V169, P373, DOI 10.1016/0301-0104(93)85108', '45', 18, 18, 'TAYLOR & FRANCIS LTD', 'LONDON', 'ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE', '0026-8976', '', 'MOL PHYS', 'Mol. Phys.', 'JUL', '1994', '82', '4', '', '', '', '787', '814', '', '10.1080/00268979400100564', '', '28', '', 'Physi', 'Physi', 'NZ038', 'WOS:A', 0, 0),
(120, '', 'J', 'DEANDRES, A;TABOADA, S;MARTINEZ, JL;SALINAS, A;HERNANDEZ, J;SAEZPUCHE, R;', 'DEANDRES, A; TABOADA, S; MARTINEZ, JL; SALINAS, A; HERNANDEZ, J; SAEZPUCHE, R', '', '', '', '', 'OPTICAL PHONONS IN R2BAMO5 OXIDES WITH M = CO, NI, CU, AND R = A RARE-EARTH', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'Compounds with the formula R2BaMO5 where R=rare earth and M =Co, Ni, or Cu, have been studied with Raman spectroscopy. The lattice dynamics of the three different crystallographic phases adopted by these systems (space groups Immm, Pnma, and P4/mbm) is discussed in relation to the transition-metal-oxygen coordination, and to the binding M-O and R-O distances. An almost complete identification of the normal modes has been performed for the compounds with the P4/mbm structure and an estimation of the parameters of the M-O and R-O stretching force constants has been obtained for the Immm and P4/mbm structures.', 'UNIV COMPLUTENSE MADRID,FAC CIENCIAS QUIM,DEPT QUIM INORGAN,E-28040 MADRID,SPAIN', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID,FAC CIENCIAS,CSIC,INST CIENCIA MAT MADRID,C-4,E-28049 MADRID,SPAIN.', '', '', '', 'ABRASHEV MV, 1992, PHYS REV B, V45, P8046, DOI 10.1103/PhysRevB.45.8046; ALONSO JA, 1990, SOLID STATE COMMUN, V76, P467, DOI 10.1016/0038-1098(90)9065', '18', 23, 23, 'AMERICAN PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '0163-1829', '', 'PHYS REV B', 'Phys. Rev.', 'JUN 1', '1993', '47', '22', '', '', '', '14898', '14904', '', '10.1103/PhysRevB.47.14898', '', '7', '', 'Physi', 'Physi', 'LF531', 'WOS:A', 0, 0),
(121, '', 'S', 'DEANDRES, A;TABOADA, S;MARTINEZ, JL;SALINAS, A;SAEZPUCHE, R;', 'DEANDRES, A; TABOADA, S; MARTINEZ, JL; SALINAS, A; SAEZPUCHE, R', '', '', '', 'Meissner, M; Pohl, RO', 'PHONON AND LUMINESCENCE PROCESSES STUDIED BY RAMAN-SPECTROSCOPY IN HIGH-T(C) RELATED OXIDES', 'PHONON SCATTERING IN CONDENSED MATTER VII: PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE', 'SPRINGER SERIES IN SOLID-STATE SCIENCES', '', 'English', 'Proceedings Pap', '7th International Conference on Phonon Scattering in Condensed Matter', 'AUG 03-07,', 'ITHACA, NY', 'INT UNION PURE & APPL PHYS, NATL SCI FDN, USA RES OFF, USN OFF NAVAL RES, CORNELL UNIV, VICE PRESIDE', 'CORNELL UNIV', '', NULL, 'UNIV AUTONOMA MADRID,DEPT FIS MAT,CSIC,INST CIENCIA MAT MADRID,E-28049 MADRID,SPAIN', '', '', '', '', '', '', 0, 0, 'SPRINGER-VERLAG BERLIN', 'BERLIN 33', 'HEIDELBERGER PLATZ 3, W-1000 BERLIN 33, GERMANY', '0171-1873', '3-540-56395-4', 'SPRINGER S', '', '', '1993', '112', '', '', '', '', '196', '197', '', '', '', '2', '', 'Physi', 'Physi', 'BB68D', 'WOS:A', 0, 0),
(122, '', 'J', 'DESANTIS, M;DEANDRES, A;RAOUX, D;MAURER, M;RAVET, MF;PIECUCH, M;', 'DESANTIS, M; DEANDRES, A; RAOUX, D; MAURER, M; RAVET, MF; PIECUCH, M', '', '', '', '', 'ANOMALOUS X-RAY-DIFFRACTION OF AN HEXAGONAL FE/RU SUPERLATTICE', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'Molecular-beam-epitaxy-grown hexagonal Fe/Ru superlattices have been investigated by anomalous x-ray diffraction near the iron absorption K edge to inquire selectively into the structure of both the iron and the ruthenium sublattices. The data have been analyzed by comparing simulated and experimental spectra in k space at various wavelengths and by means of a difference Fourier-transform method that allows us to trace the iron density profile along the growth direction of the superlattice and then directly probe the Fe/Ru interface. From both methods we extract the interplanar spacing for Fe and Ru. We get c(Fe) approximately 4.11 angstrom and C(Ru) approximately 4.33 angstrom. The value a approximately 2.69 angstrom is the same for both sublattices. We can thus calculate the atomic volume of hexagonal Fe in the superlattice V(Fe) approximately 12.87 angstrom3 which is expanded by 14% with respect to hcp Fe. This may explain the onset of ferromagnetism in this metastable hexagonal Fe phase.', 'LAB UTILISAT RAYONNEMENT ELECTROMAGNET,BATIMENT 209D,F-91405 ORSAY,FRANCE; CNRS,MIXTE LAB,F-54709 PONT A MOUSSON,FRANCE', '', '', '', '', 'BAUDELET F, IN PRESS PHYS REV B; CHATILLON C, 1990, MATER SCI FORUM, V60, P229; CHATILLON C, 1990, MATER SCI FORUM, V59, P229; FALCO CM, 1987, J PHYS-', '10', 20, 20, 'AMERICAN PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '0163-1829', '', 'PHYS REV B', 'Phys. Rev.', 'DEC 15', '1992', '46', '23', '', '', '', '15465', '15471', '', '10.1103/PhysRevB.46.15465', '', '7', '', 'Physi', 'Physi', 'KG306', 'WOS:A', 0, 0),
(123, '', 'J', 'SALINASSANCHEZ, A;SAEZPUCHE, R;FERNANDEZ, F;DEANDRES, A;LAVAT, AE;BARAN, EJ;', 'SALINASSANCHEZ, A; SAEZPUCHE, R; FERNANDEZ, F; DEANDRES, A; LAVAT, AE; BARAN, EJ', '', '', '', '', 'CRYSTALLOGRAPHIC DATA, VIBRATIONAL-SPECTRA, AND MAGNETIC-PROPERTIES OF THE 2 POLYMORPHIC FORMS OF TM2BANIO5', 'JOURNAL OF SOLID STATE CHEMISTRY', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'UNIV AUTONOMA MADRID,CSIC,INST CIENCIA MAT,DEPT FIS APLICADA CIV,E-28049 MADRID,SPAIN; NATL UNIV LA PLATA,DEPT QUIM,RA-1900 LA PLATA,ARGENTINA; UNIV N', 'SAEZPUCHE, R (reprint author), UNIV COMPLUTENSE MADRID,FAC QUIM,DEPT QUIM INORGAN,E-28040 MADRID,SPAIN.', '', '', '', 'ALONSO JA, 1990, SOLID STATE COMMUN, V76, P467, DOI 10.1016/0038-1098(90)90651-Q; AMADOR J, 1990, PHYS REV B, V42, P7918, DOI 10.1103/PhysRevB.42.7918', '14', 20, 20, 'ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS', 'SAN DIEGO', '525 B ST, STE 1900, SAN DIEGO, CA 92101-4495', '0022-4596', '', 'J SOLID ST', 'J. Solid S', 'JUL', '1992', '99', '1', '', '', '', '63', '71', '', '10.1016/0022-4596(92)90289-8', '', '9', '', 'Chemi', 'Chemi', 'JA179', 'WOS:A', 0, 0),
(124, '', 'J', 'DEANDRES, A;MARTINEZ, JL;ODIER, P;', 'DEANDRES, A; MARTINEZ, JL; ODIER, P', '', '', '', '', 'DYNAMIC STUDY OF THE STRUCTURAL AND MAGNETIC PHASES IN PR2NIO4 SINGLE-CRYSTALS BY RAMAN-SPECTROSCOPY', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'Polarized Raman spectra of stoichiometric Pr2NiO4 single crystals have been obtained for temperatures between 74 and 300 K in a spectral range of 6000 cm-1. The lattice dynamics of the orthorhombic-to-tetragonal low-temperature phase transition has been characterized. The intensity associated with the in-plane Ni-O(1) modes is much lower than the corresponding modes related to motions along the c axis. Five A(g) modes have been identified with the corresponding atomic vibrations. The frequencies and widths of some particular modes show a discontinuous behavior at the transition temperature (T(c) congruent-to 117 K). Below this temperature, additional modes appear with very low intensities. Polarized two-magnon scattering is observed as wide bands whose intensity increases with decreasing temperature as does the magnetization. The characteristics of the observed two-magnon spectra do not correspond to classical two-spin scattering; their selection rules indicate that the Ni interlayer coupling plays an important role in the process.', 'CTR PHYS HAUTES TEMP, CNRS, F-45071 ORLEANS 2, FRANCE', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID, CSIC, INST CIENCIA MAT MADRID, DEPT FIS APL CIV, E-28049 MADRID, SPAIN.', '', '', '', 'BASSAT JM, 1987, PHYS REV B, V35, P7126, DOI 10.1103/PhysRevB.35.7126; BATES FE, 1989, SOLID STATE COMMUN, V72, P187, DOI 10.1016/0038-1098(89)90520-6', '28', 8, 8, 'AMER PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '1098-0121', '', 'PHYS REV B', 'Phys. Rev.', 'JUN 1', '1992', '45', '22', '', '', '', '12821', '12829', '', '10.1103/PhysRevB.45.12821', '', '9', '', 'Physi', 'Physi', 'HZ242', 'WOS:A', 0, 0),
(125, '', 'J', 'DEANDRES, A;MARTINEZ, JL;SAEZPUCHE, R;SALINASSANCHEZ, A;', 'DEANDRES, A; MARTINEZ, JL; SAEZPUCHE, R; SALINASSANCHEZ, A', '', '', '', '', 'VIBRATIONAL STUDY OF R2BANIO5(R = Y, HO, ER OR TM), NIO6 ONE-DIMENSIONAL CHAINS, AND TM2BANIO5, NIO5 PYRAMIDS', 'SOLID STATE COMMUNICATIONS', '', '', 'English', 'Article', '', '', '', '', '', '', 'Raman scattering experiments have been performed in R2BaNiO5 (R = Y, Ho, Er, or Tm) polycrystalline samples. All the compounds crystallize in the Immm space group. The Tm system is dymorphic and has also been obtained in the Pnma phase. Out of the 9 Raman active modes expected in the Immm phase, two modes associated with R ion motions and the two oxygen O(1) stretching modes have been identified. Three other weaker modes are also assigned to O(1) vibrations while the highest energy peak (740 cm-1) is the odd stretching mode of the short Ni-O(2) bond only allowed in infrared spectroscopy. An evaluation of the principal stretching force constants has been done and the non diagonal terms of the F matrix are found to be quite important. The low symmetry phase of the Tm compound shows a high number of Raman modes, however smaller than the 52 expected. Some correspondance in the energy zones of the modes has been found by comparison between both structural phases of the Tm2BaNiO5 dymorphic compound.', 'UNIV COMPLUTENSE MADRID,FAC CIENCIAS QUIM,DEPT QUIM INORGAN,E-28040 MADRID,SPAIN', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID,DEPT FIS APLICADA C-IV,CSIC,INST CIENCIA MAT,E-28049 MADRID,SPAIN.', '', '', '', 'ALONSO JA, 1990, SOLID STATE COMMUN, V76, P467, DOI 10.1016/0038-1098(90)90651-Q; AMADOR J, 1990, PHYS REV B, V42, P7918, DOI 10.1103/PhysRevB.42.7918', '14', 7, 7, 'PERGAMON-ELSEVIER SCIENCE LTD', 'OXFORD', 'THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB', '0038-1098', '', 'SOLID STAT', 'Solid Stat', 'JUN', '1992', '82', '12', '', '', '', '931', '937', '', '10.1016/0038-1098(92)90723-M', '', '7', '', 'Physi', 'Physi', 'JD236', 'WOS:A', 0, 0),
(126, '', 'J', 'PRIETO, C;DEANDRES, A;MEDARDE, M;MARTINEZ, JL;FERNANDEZDIAZ, MT;RODRIGUEZCARVAJAL, J;SAEZPUCHE, R;FERNANDEZ, F;', 'PRIETO, C; DEANDRES, A; MEDARDE, M; MARTINEZ, JL; FERNANDEZDIAZ, MT; RODRIGUEZCARVAJAL, J; SAEZPUCHE, R; FERNANDEZ, F', '', '', '', '', 'EXAFS AND RAMAN-STUDY OF STOICHIOMETRIC AND OXIDIZED ND2NIO4+DELTA', 'SOLID STATE COMMUNICATIONS', '', '', 'English', 'Article', '', '', '', '', '', '', 'The Ni and the Nd environments in the stoichiometric and oxidized Nd2NiO4+delta samples have been investigated using EXAFS spectroscopy. In the stoichiometric compound, the Ni and Nd oxygen coordination numbers have been found to be in good agreement with the neutron diffraction crystallographic data. For the oxidized sample, a rearrangement compatible with an increment of the number of oxygen atoms around the Nd ions is found. This Increment is consistent with the location of the excess oxygen atoms between the consecutive neodymium (rare earth) layers. While the Raman spectra of the stoichiometric sample is in accordance with the group theory predictions for a Cmca symmetry, oxidized sample spectra are clearly dominated by the perturbations introduced in the crystal by the oxygen defects.', 'INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE; UNIV COMPLUTENSE MADRID,DEPT QUIM INORGAN,E-28040 MADRID,SPAIN; UNIV AUTONOMA,FAC CIENCIAS C-', 'PRIETO, C (reprint author), UNIV PARIS 11,UTILIZAT RAYONNEMENT ELECTROMAGNET LAB,BAT 209 D,F-91405 ORSAY,FRANCE.', '', '', '', 'ALSO J, 1991, J PHYS-CONDENS MAT, V3, P3215; BUTTREY DJ, 1988, J SOLID STATE CHEM, V74, P233, DOI 10.1016/0022-4596(88)90350-7; DEANDRES A, 1991, J PH', '12', 3, 3, 'PERGAMON-ELSEVIER SCIENCE LTD', 'OXFORD', 'THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB', '0038-1098', '', 'SOLID STAT', 'Solid Stat', 'DEC', '1991', '80', '12', '', '', '', '975', '980', '', '10.1016/0038-1098(91)90401-G', '', '6', '', 'Physi', 'Physi', 'GY264', 'WOS:A', 0, 0),
(127, '', 'J', 'DEANDRES, A;FERNANDEZDIAZ, MT;MARTINEZ, JL;RODRIGUEZCARVAJAL, J;SAEZPUCHE, R;FERNANDEZ, F;', 'DEANDRES, A; FERNANDEZDIAZ, MT; MARTINEZ, JL; RODRIGUEZCARVAJAL, J; SAEZPUCHE, R; FERNANDEZ, F', '', '', '', '', 'RAMAN-SCATTERING OF ORTHORHOMBIC AND TETRAGONAL LN2NIO4+DELTA (LN = LA, PR, ND) OXIDES', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', 'English', 'Article', '', '', '', '', '', '', 'The vibrational properties of polycrystalline Ln2NiO4+sigma (Ln = La, Pr and Nd) have been investigated by means of Raman scattering in samples with several oxygen contents (delta = 0 and 0.15) at different temperatures (74 K < T < 250 K), and over a spectral range 50-5500 cm-1. The factor group analysis predicts 18 Raman-active modes for the room-temperature phase of stoichiometric samples (delta = 0, orthorhombic D2h18 (Bmab)). Nearly all the observed peaks have been identified with particular atomic displacements even if no selection rules can be applied in powder samples. Two large double-phonon peaks are observed and the dependence of the phonon frequencies on the Ln ion is studied. Two out of the four allowed modes for the oxidized compounds are identified together with some spurious peaks corresponding to defects in the lattice, probably due to randomly distributed interstitial oxygen atoms.', 'CSIC,INST CIENCIA MAT BARCELONA,E-08028 BARCELONA,SPAIN; UNIV COMPLUTENSE MADRID,FAC CIENCIAS QUIM,DEPT QUIM INORGAN,E-28040 MADRID,SPAIN', 'DEANDRES, A (reprint author), UNIV AUTONOM MADRID,CSIC,INST CIENCIA MAT MADRID,DEPT FIS APLICADA C-4,E-28049 MADRID,SPAIN.', '', '', '', 'AXE JD, 1989, PHYS REV LETT, V62, P2751, DOI 10.1103/PhysRevLett.62.2751; BATES FE, 1989, SOLID STATE COMMUN, V72, P187, DOI 10.1016/0038-1098(89)9052', '23', 10, 10, 'IOP PUBLISHING LTD', 'BRISTOL', 'TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX', '0953-8984', '', 'J PHYS-CON', 'J. Phys.-C', 'MAY 27', '1991', '3', '21', '', '', '', '3813', '3823', '', '', '', '11', '', 'Physi', 'Physi', 'FP277', 'WOS:A', 0, 0),
(128, '', 'J', 'MAURER, M;PIECUCH, M;RAVET, MF;OUSSET, JC;SANCHEZ, JP;AARON, C;DEKOSTER, J;RAOUX, D;DEANDRES, A;DESANTIS, M;FONTAINE, A;BAUDELET, F;ROUVIERE, JL;DIENY, B;', 'MAURER, M; PIECUCH, M; RAVET, MF; OUSSET, JC; SANCHEZ, JP; AARON, C; DEKOSTER, J; RAOUX, D; DEANDRES, A; DESANTIS, M; FONTAINE, A; BAUDELET, F; ROUVIERE, JL; DIENY, B', '', '', '', '', 'MAGNETISM AND STRUCTURE IN HEXAGONAL FE/RU SUPERLATTICES WITH SHORT PERIODICITY', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', 'English', 'Article; Procee', 'SYMP OF THE 1990 SPRING CONF OF THE EUROPEAN MATERIALS RESEARCH SOC : MAGNETIC THIN FILMS, MULTILAYE', 'MAY 29-JUN', 'STRASBOURG, FRANCE', 'EUROPEAN MAT RES SOC, CNRS, IBM, ALMADEN RES, IBM GERMANY, PHILIPS EINDHOVEN, DUPONT CO, SIEMENS GER', '', '', 'We present recent results on the structure and on the magnetic properties of Fe/Ru superlattices. Detailed knowledge of the local structure is obtained from X-ray diffraction, including in the anomalous mode, and by EXAFS, thus bringing evidence that Fe layers correspond to an expansion exceeding 10%. The magnetic state is mostly characterized by Mossbauer spectroscopy and also by magnetization measurements, thus demonstrating that the internal Fe layer carry a moment of about 2-mu-B, whereas the two interfacial layers bear no moment. Except for the extension of the non-magnetic interface, these results are in agreement with theoretical predictions of Kubler, which indicate an high-spin metastable state for such an expanded hcp Fe phase.', 'CNRS,LAB ST GOBAIN,CR PAM,F-54704 PONT A MOUSSON,FRANCE; CATHOLIC UNIV LEUVEN,INST KERN STRALINGSFYS,B-3030 HEVERLEE,BELGIUM; UNIV AUTONOM MADRID,DEPT', '', '', '', '', 'BAGAYOKO D, 1983, PHYS REV B, V28, P5419, DOI 10.1103/PhysRevB.28.5419; BAUDELET F, UNPUB; BLAHA P, 1988, PHYS REV B, V37, P2792, DOI 10.1103/PhysRevB', '34', 31, 31, 'ELSEVIER SCIENCE BV', 'AMSTERDAM', 'PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS', '0304-8853', '', 'J MAGN MAG', 'J. Magn. M', 'FEB', '1991', '93', '', '', '', '', '15', '24', '', '10.1016/0304-8853(91)90296-M', '', '10', '', 'Mater', 'Mater', 'FP221', 'WOS:A', 0, 0),
(129, '', 'J', 'DEANDRES, A;FERNANDEZDIAZ, MT;MARTINEZ, JL;RODRIGUEZCARVAJAL, J;SAEZPUCHE, R;FERNANDEZ, F;', 'DEANDRES, A; FERNANDEZDIAZ, MT; MARTINEZ, JL; RODRIGUEZCARVAJAL, J; SAEZPUCHE, R; FERNANDEZ, F', '', '', '', '', 'RAMAN-SCATTERING STUDY OF LA2NIO4+DELTA, PR2NIO4+DELTA AND ND2NIO4+DELTA', 'EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY', '', '', 'English', 'Article; Procee', '1ST INTERNATIONAL CONF ON F-ELEMENTS : NEW DEVELOPMENTS IN F-ELEMENTS', 'SEP 04-07,', 'LEUVEN, BELGIUM', '', '', '', 'We have studied the Raman spectra at different temperatures (74 K < T < 250 K), and oxygen contents (delta = 0 and 0.13) of Ln2NiO4+delta (Ln = La, Pr and Nd) powder samples. The factor group analysis predicts 18 Raman active modes for the stoichiometric samples (delta = 0, orthorhombic D2h18). Nearly all the observed peaks have been identified with concrete atomic displacements even if no selection rules can be applied in powder samples. An electronic transition at 2.06 eV has been observed in the Raman spectra of the La2NiO4 compound that can be associated to the luminiscence in the gap of the material.', 'CSIC,INST CIENCIA MAT BARCELONA,E-08028 BARCELONA,SPAIN; UNIV COMPLUTENSE MADRID,FAC CIENCIAS QUIM,DEPT QUIM,DEPT QUIM INORGAN,E-28040 MADRID,SPAIN', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID,CSIC,INST CIENCIA MAT MADRID,DIPARTIMENTO FIS APLICADA CIV,E-28049 MADRID,SPAIN.', '', '', '', 'BATES FE, 1989, SOLID STATE COMMUN, V72, P187, DOI 10.1016/0038-1098(89)90520-6; GERVAIS F, 1988, PHYS REV B, V37, P9364, DOI 10.1103/PhysRevB.37.9364', '5', 3, 3, 'GAUTHIER-VILLARS', 'PARIS', 'S P E S-JOURNAL DEPT, 120 BD ST GERMAIN, F-75006 PARIS, FRANCE', '0992-4361', '', 'EUR J SOL ', 'Eur. J. So', '', '1991', '28', '', '', '', 'S', '179', '182', '', '', '', '4', '', 'Chemi', 'Chemi', 'FD293', 'WOS:A', 0, 0),
(130, '', 'J', 'FERNANDEZDIAZ, T;DEANDRES, A;PRIETO, C;', 'FERNANDEZDIAZ, T; DEANDRES, A; PRIETO, C', '', '', '', '', 'GROWTH AND CHARACTERIZATION OF THALLIUM DIHYDROGEN PHOSPHATE SINGLE-CRYSTALS', 'FERROELECTRICS', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'UNIV AUTONOMA MADRID,CSIC,INST CIENCIA MAT MADRID,E-28049 MADRID,SPAIN', 'FERNANDEZDIAZ, T (reprint author), UNIV AUTONOMA MADRID,DEPT FIS APL,C-4,E-28049 MADRID,SPAIN.', '', '', '', 'AREND H, 1986, J CRYST GROWTH, V74, P321, DOI 10.1016/0022-0248(86)90120-X; BURFOOT JC, 1979, POLAR DIELLECTRIC TH; COURTENS E, 1984, PHYS REV LETT, V', '13', 8, 8, 'GORDON BREACH SCI PUBL LTD', 'READING', 'C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL', '0015-0193', '', 'FERROELECT', '', '', '1989', '92', '', '', '', '', '71', '75', '', '10.1080/00150198908211309', '', '5', '', 'Mater', 'Mater', 'AJ085', 'WOS:A', 0, 0),
(131, '', 'J', 'DEANDRES, A;PRIETO, C;', 'DEANDRES, A; PRIETO, C', '', '', '', '', 'RAMAN-SCATTERING IN TLH2PO4', 'PHASE TRANSITIONS', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'CSIC,DEPT FIS APLICADA C4,BARCELONA,SPAIN; UNIV AUTONOMA MADRID,E-28049 MADRID,SPAIN', 'DEANDRES, A (reprint author), CSIC,INST CIENCIA MAT,BARCELONA,SPAIN.', '', '', '', 'ARGUELLO CA, 1969, PHYS REV, V181, P1351, DOI 10.1103/PhysRev.181.1351; COURTENS E, 1985, JPN J APPL PHYS S, V24, P70; Herzberg G, 1945, INFRARED RAMA', '12', 9, 9, 'GORDON BREACH SCI PUBL LTD', 'READING', 'C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL', '0141-1594', '', 'PHASE TRAN', 'Phase Tran', '', '1989', '14', '1-4', '', 'B', '', '3', '9', '', '10.1080/01411598908208075', '', '7', '', 'Cryst', 'Cryst', 'T3825', 'WOS:A', 0, 0),
(132, '', 'J', 'DEANDRES, A;', 'DEANDRES, A', '', '', '', '', 'APPLICATIONS OF A POINT POLARIZABLE ION MODEL TO SUZUKI PHASE PRECIPITATES IN ALKALI-HALIDES', 'PHYSICA STATUS SOLIDI B-BASIC RESEARCH', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, '', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID,DEPT FIS APLICADA C-4,E-28049 MADRID,SPAIN.', '', '', '', 'AGULLOLOPEZ F, 1986, PROG MATER SCI, V30, P187, DOI 10.1016/0079-6425(86)90006-X; BANNON NM, 1985, PHILOS MAG A, V52, P61; BENEDEK G, 1984, J PHYS CHE', '14', 0, 0, 'AKADEMIE VERLAG GMBH', 'BERLIN', 'MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY', '0370-1972', '', 'PHYS STATU', 'Phys. Stat', 'NOV', '1988', '150', '1', '', '', '', '31', '37', '', '10.1002/pssb.2221500105', '', '7', '', 'Physi', 'Physi', 'R8805', 'WOS:A', 0, 0),
(133, '', 'J', 'DEANDRES, A;CALLEJA, JM;POLLINI, I;BENEDEK, G;', 'DEANDRES, A; CALLEJA, JM; POLLINI, I; BENEDEK, G', '', '', '', '', 'STUDY OF THE CRYSTALLINE PRECIPITATES IN NACL-COCL2 BY OPTICAL-ABSORPTION AND RAMAN-SPECTROSCOPY', 'JOURNAL OF MOLECULAR STRUCTURE', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'UNIV MILAN,CONSIGLIO NAZL RIC,DIPARTIMENTO FIS,I-20122 MILAN,ITALY; UNIV AUTONOMA MADRID,CSIC,INST FIS ESTAD SOLIDO,E-28049 MADRID,SPAIN', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID,CSIC,DEPT OPT & ESTRUCT MAT,E-28049 MADRID,SPAIN.', '', '', '', 'BENEDEK G, 1984, J PHYS CHEM SOLIDS, V45, P741, DOI 10.1016/0022-3697(84)90071-4; CALLEJA JM, 1980, J PHYS CHEM SOLIDS, V41, P1367, DOI 10.1016/0022-3', '10', 8, 8, 'ELSEVIER SCIENCE BV', 'AMSTERDAM', 'PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS', '0022-2860', '', 'J MOL STRU', 'J. Mol. St', 'MAR', '1986', '143', '', '', '', '', '71', '74', '', '10.1016/0022-2860(86)85207-3', '', '4', '', 'Chemi', 'Chemi', 'C1087', 'WOS:A', 0, 0),
(134, '', 'J', 'LOPEZ, FJ;MURRIETA, H;DEANDRES, A;RUBIO, J;SOLE, JG;', 'LOPEZ, FJ; MURRIETA, H; DEANDRES, A; RUBIO, J; SOLE, JG', '', '', '', '', 'ELECTRON-PARAMAGNETIC-RES SPECTRA OF MN-2+ IONS IN PRECIPITATED DIVALENT IMPURITY PHASES IN MONOCRYSTALLINE NACL', 'SOLID STATE COMMUNICATIONS', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'UNIV AUTONOMA MADRID,CSIC,INST FIS ESTADO SOLIDO,E-28049 MADRID,SPAIN', 'LOPEZ, FJ (reprint author), UNIV AUTONOMA MADRID,DEPT OPT & ESTRUCT MAT,E-28049 MADRID,SPAIN.', '', '', '', 'BELTRANLOPEZ V, 1980, J MAGN RESON, V39, P437, DOI 10.1016/0022-2364(80)90032-3; CALLEJA JM, 1980, J PHYS CHEM SOLIDS, V41, P1367, DOI 10.1016/0022-36', '27', 5, 5, 'PERGAMON-ELSEVIER SCIENCE LTD', 'OXFORD', 'THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB', '0038-1098', '', 'SOLID STAT', 'Solid Stat', 'MAR', '1986', '57', '10', '', '', '', '799', '803', '', '10.1016/0038-1098(86)90179-1', '', '5', '', 'Physi', 'Physi', 'A1635', 'WOS:A', 0, 0),
(135, '', 'J', 'DEANDRES, A;CALLEJA, JM;POLLINI, I;BENEDEK, G;', 'DEANDRES, A; CALLEJA, JM; POLLINI, I; BENEDEK, G', '', '', '', '', 'CRYSTAL-FIELD SPECTROSCOPY OF THE CRYSTALLINE PRECIPITATES IN NACL-CO2+', 'JOURNAL OF CHEMICAL PHYSICS', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'CNR,GRP NAZL STRUTTURA MAT,I-20133 MILAN,ITALY; UNIV MILAN,DEPARTIMENTO FIS,I-20133 MILAN,ITALY', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID,DEPT OPT & ESTRUCTURA MAT,E-28049 MADRID,SPAIN.', '', '', '', 'BALLHAUSEN CJ, 1958, J MOL SPECTROSC, V2, P342, DOI 10.1016/0022-2852(58)90086-9; BALLHAUSEN CJ, 1955, ACTA CHEM SCAND, V9, P397, DOI 10.3891/acta.che', '35', 9, 9, 'AMER INST PHYSICS', 'WOODBURY', 'CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999', '0021-9606', '', 'J CHEM PHY', 'J. Chem. P', '', '1985', '83', '10', '', '', '', '4967', '4971', '', '', '', '5', '', 'Physi', 'Physi', 'ATT21', 'WOS:A', 0, 0),
(136, '', 'J', 'ACEITUNO, P;CUSSO, F;DEANDRES, A;JAQUE, F;', 'ACEITUNO, P; CUSSO, F; DEANDRES, A; JAQUE, F', '', '', '', '', 'AGGREGATION PATHWAYS AND SUZUKI PHASE FORMATION IN DOPED ALKALI-HALIDES', 'SOLID STATE COMMUNICATIONS', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'UNIV AUTONOMA MADRID,CSIC,INST FIS ESTADO SOLIDO,MADRID 34,SPAIN', 'ACEITUNO, P (reprint author), UNIV AUTONOMA MADRID,CSIC,DEPT OPT & ESTRUCTURA MAT,MADRID 34,SPAIN.', '', '', '', 'ANDREEV GA, 1979, PHYS STATUS SOLIDI A, V52, pK115, DOI 10.1002/pssa.2210520247; BANNAGHAN AJ, 1982, 7TH P INT S REACT SO; BOHUN A, 1971, Z PHYS, V243', '22', 8, 8, 'PERGAMON-ELSEVIER SCIENCE LTD', 'OXFORD', 'THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB', '0038-1098', '', 'SOLID STAT', 'Solid Stat', '', '1984', '49', '3', '', '', '', '209', '212', '', '10.1016/0038-1098(84)90895-0', '', '4', '', 'Physi', 'Physi', 'RY232', 'WOS:A', 0, 0),
(137, '', 'J', 'DEANDRES, A;CALLEJA, JM;LOPEZ, FJ;JAQUE, F;RODRIGUEZ, F;MORENO, M;', 'DEANDRES, A; CALLEJA, JM; LOPEZ, FJ; JAQUE, F; RODRIGUEZ, F; MORENO, M', '', '', '', '', 'STUDIES OF THE SUZUKI PHASE IN MN-DOPED NACL', 'RADIATION EFFECTS AND DEFECTS IN SOLIDS', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'UNIV AUTONOMA MADRID,CSIC,INST FIS ESTADO SOLIDO,MADRID 34,SPAIN; UNIV SANTANDER,FAC CIENCIAS,DEPT FIS FUNDAMENTAL,SANTANDER,SPAIN', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID,CSIC,DEPT OPT & ESTRUCT MAT,MADRID 34,SPAIN.', '', '', '', 'BANNAGHAN AJ, 1972, 7TH P INT S REACT SO, P75; CALLEJA JM, 1980, J PHYS CHEM SOLIDS, V41, P1367, DOI 10.1016/0022-3697(80)90143-2; CHAPMAN JA, 1975, J', '10', 4, 4, 'GORDON BREACH SCI PUBL LTD', 'READING', 'C/O STBS LTD, PO BOX 90, READING, BERKS, ENGLAND RG1 8JL', '1042-0150', '', 'RADIAT EFF', 'Radiat. Ef', '', '1983', '75', '1-4', '', '', '', '241', '245', '', '10.1080/00337578308224707', '', '5', '', 'Nucle', 'Nucle', 'RL270', 'WOS:A', 0, 0),
(138, '', 'J', 'DEANDRES, A;CALLEJA, JM;', 'DEANDRES, A; CALLEJA, JM', '', '', '', '', 'TRENDS OF THE RAMAN ACTIVE PHONONS OF THE SUZUKI PHASE IN ALKALI-HALIDES', 'SOLID STATE COMMUNICATIONS', '', '', 'English', 'Article', '', '', '', '', '', '', NULL, 'UNIV AUTONOMA MADRID,CSIC,INST FIS ESTADO SOLIDO,MADRID 34,SPAIN', 'DEANDRES, A (reprint author), UNIV AUTONOMA MADRID,DEPT OPT & ESTRUCTURA MATERIA,MADRID 34,SPAIN.', '', '', '', 'ANDREEV GA, 1981, J PHYS CHEM SOLIDS, V42, P551, DOI 10.1016/0022-3697(81)90039-1; ANDREEV GA, 1979, PHYS STATUS SOLIDI A, V52, pK115, DOI 10.1002/pss', '31', 18, 18, 'PERGAMON-ELSEVIER SCIENCE LTD', 'OXFORD', 'THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB', '0038-1098', '', 'SOLID STAT', 'Solid Stat', '', '1983', '48', '11', '', '', '', '949', '953', '', '10.1016/0038-1098(83)90538-0', '', '5', '', 'Physi', 'Physi', 'RU575', 'WOS:A', 0, 0),
(381, '', 'J', 'Rubin, J;Jimenez-Villacorta, F;Bartolome, J;Prieto, C;', 'Rubin, J.; Jimenez-Villacorta, F.; Bartolome, J.; Prieto, C.', '', '', '', '', 'CEMS spectra of non-spherical nanoparticles in oxidized iron thin films', 'HYPERFINE INTERACTIONS', '', '', '', '', '', '', '', '', '', '', 'Room temperature CEMS spectra and field-cooled and zero field-cooled hysteresis loops have been measured on oxidized iron films of 100 nm thickness. The iron films were sputtered on a Si substrate, while the substrate temperature, T-s, was kept at 200 K and 300 K, and subsequently oxidized. The magnetization of the T-s = 200 K sample decreases ca. 40% with respect to the T-s = 300 K one, and a small exchange bias appears. The CEMS spectra show a preferential orientation of the magnetization of the films, which is more tilted toward a direction parallel to the film plane as T-s is decreased, which is attributed to a competition between shape anisotropies.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0304-3843', '', '', '', 'JUL', '2008', '185', '1-3', '', '', '', '33', '38', '', '10.1007/s10751-008-9805-7', '', '', '', '', '', '', 'WOS:0', 0, 0),
(382, '', 'J', 'Cespedes, E;Castro, GR;Jimenez-Villacorta, F;de Andres, A;Prieto, C;', 'Cespedes, E.; Castro, G. R.; Jimenez-Villacorta, F.; de Andres, A.; Prieto, C.', '', '', '', '', 'Mn local order in room temperature ferromagnetic Mn/ZnO multilayers', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'The local environment of Mn atoms in (ZnO(30) angstrom/Mn(t))(n) multilayers (ML) has been studied by means of x-ray absorption spectroscopy at the Mn K edge. A series of ML has been prepared by sputtering with approximately constant total amount of Mn (300 angstrom) while the Mn layer thickness (t) has been varied from 60 to 1 angstrom (modifying consequently the number of Mn-ZnO interfaces) in order to study the Mn-Zn-O system. Variation of the Mn layer thickness (t) has been directly associated with changes in the Mn oxidation states within the sample series. Absorption spectroscopy results for films with t <= 15 angstrom indicate mostly MnO(2) formation and no signal of Mn in the ZnO lattice is found. Conversely, films with t >= 30 angstrom present two different Mn environments, that have been related to the coexistence of rocksalt and wurtzite phases, formed by Zn(1-x)Mn(x)O mixed solid solutions. The magnetic behaviour of samples is correlated with structural properties. That correlation strongly points towards substitutional Mn in the wurtzite phase as the origin of the observed ferromagnetism above room temperature.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0953-8984', '', '', '', 'MAR 5', '2008', '20', '9', '', '', '', '', '', '095207', '10.1088/0953-8984/20/9/095207', '', '', '', '', '', '', 'WOS:0', 0, 0),
(380, '', 'J', 'Jimenez-Villacorta, F;Cespedes, E;Vila, M;Munoz-Martin, A;Castro, GR;Prieto, C;', 'Jimenez-Villacorta, F.; Cespedes, E.; Vila, M.; Munoz-Martin, A.; Castro, G. R.; Prieto, C.', '', '', '', '', 'Microstructural properties and local order around iron in granular metal-insulator Fe/Si3N4 systems prepared by magnetron sputtering', 'JOURNAL OF PHYSICS D-APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', '[Fe/Si(3)N4] multilayers have been prepared by magnetron sputtering with a layer thickness of 3 nm for silicon nitride and the iron layer ranging from 1 to 10 nm. A variety of techniques for determining the microstructure, such as x-ray reflectivity, transmission electron microscopy and Rutherford backscattering spectrometry techniques, have been performed to unveil the microstructure of such samples. Also, an analysis of the local environment around iron, by means of extended x-ray absorption fine structure and x-ray absorption near-edge structure spectroscopies performed at the Fe K-edge, confirms the presence of two phases forming the iron layers, the metallic Fe and the FeN phase. Special emphasis has been placed on the x-ray absorption analysis for multilayers with smaller Fe layer thicknesses, which present features of granular systems.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0022-3727', '', '', '', 'OCT 21', '2008', '41', '20', '', '', '', '', '', '205009', '10.1088/0022-3727/41/20/205009', '', '', '', '', '', '', 'WOS:0', 0, 0),
(378, '', 'J', 'Jimenez-Villacorta, F;Morillas, RM;Salas, E;Cespedes, E;Prieto, C;', 'Jimenez-Villacorta, Felix; Martinez Morillas, Rocio; Salas, Eduardo; Cespedes, Eva; Prieto, Carlos', '', '', '', '', 'Core-Shell Magnetic Behavior of Ultrathin Films Prepared by Sputtering at Very Low Temperatures', 'IEEE TRANSACTIONS ON MAGNETICS', '', '', '', '', 'International Magnetics Conference (Intermag)', 'MAY 04-08,', 'Madrid, SPAIN', '', '', '', 'We report a magnetic characterization of iron thin films of 6 nm prepared on Si (001) substrates by sputtering at different substrate temperatures. Magnetization loops and zero field cooling-field cooling measurements were performed to unveil the magnetic features of such systems. Magnetic parameters show that films prepared at very low temperature (T(S) = 200 K) present features of a core-shell granular systems, formed by ferromagnetic iron grains surrounded by an antiferromagnetic iron oxide phase.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0018-9464', '', '', '', 'NOV', '2008', '44', '11', '', '', '', '2792', '2795', '', '10.1109/TMAG.2008.2001784', '', '', '', '', '', '', 'WOS:0', 0, 0),
(379, '', 'J', 'Boada, R;Laguna-Marco, MA;Piquer, C;Jimenez-Villacorta, F;Chaboy, J;', 'Boada, R.; Laguna-Marco, M. A.; Piquer, C.; Jimenez-Villacorta, F.; Chaboy, J.', '', '', '', '', 'Effect of Aluminium Substitution in RT2 Compounds (R = rare-earth, T = transition metal) on the Magnetic Properties by Modification of the Electronic ', 'IEEE TRANSACTIONS ON MAGNETICS', '', '', '', '', 'IEEE International Magnetics Conference (INTERMAG)', 'MAY 04-08,', 'Madrid, SPAIN', '', '', '', 'We present an X-ray absorption spectroscopy (XAS) study performed at both the Fe K-edge and rare-earth L-1,L-3-edges; of the R1-xRx''(Fe1-yAly)(2) series (R = Ho, Er and R'' = Lu, Y). We show that substitution of the rare-earth (Ho, Er) by a non-magnetic one (Y, Lu) acts as a simple magnetic dilution effect. In contrast, the magnetic properties of these systems are drastically changed when Fe is substituted by the non-magnetic Al, independently of the rare-earth involved. The combined study of the different regions of the absorption spectra for the different atomic species in these materials allow us to disentangle the structural and electronic effects of the substitution. Our results reveal that the change of the magnetic properties upon Al substitution are triggered by the strong modification of the density of states (DOS) which also affects the R(5d)-Fe(3d) hybridization.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0018-9464', '', '', '', 'NOV', '2008', '44', '11', '', '2', '', '4214', '4217', '', '10.1109/TMAG.2008.2001315', '', '', '', '', '', '', 'WOS:0', 0, 0),
(377, '', 'J', 'Jimenez-Villacorta, F;Prieto, C;Castro, GR;', 'Jimenez-Villacorta, F.; Prieto, C.; Castro, G. R.', '', '', '', 'DiCicco, A; Filipponi, A', 'X-ray absorption spectroscopy study of granular Fe/Si(3)N(4) systems', '14TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS14), PROCEEDINGS', 'Journal of Physics Conference Series', '', '', '', '14th International Conference on X-Ray Absorption Fine Structure (XAFS14)', 'JUL 26-31,', 'Camerino, ITALY', '', '', '', '[Fe(tFe)/Si(3)N(4)(3 nm)] multilayers were prepared by sequential magnetron sputtering. The Fe layer thickness has been varied for every sample. Magnetic properties show a gradual evolution from a ferromagnetic state for samples with larger metal thickness to a granular behaviour for the samples with the smallest Fe layer thickness. Microstructural features such as average thickness and granularity, as well as the local order around Fe atoms, were studied by x-ray reflectometry and x-ray absorption spectroscopy, respectively. X-ray reflectometry suggests that the formation of discontinuous metal-insulator multilayers is produced at tFe <= 1.3 nm. Extended x-ray absorption fine structure (EXAFS) analysis shows a reduction, of the Fe-Fe coordination shell as the metal layer thickness decreases. Moreover, a new phase emerges, and it is visible at the samples with t(Fe) <= 1.3 nm. This coordination shell is attributed to the formation of Fe-N bonds likely placed at the interface regions. X-ray absorption near edge spectroscopy (XANES) at the Fe K-edge shows as well the evolution from the metallic spectrum to a combined contribution of 2 phases as the metal layer thickness decreases. XANES calculations performed within the real-space multiple-scattering formalism of two nanometric phases for metal bcc Fe and tetrahedral FeN in zinc-blende structure provide a successful explanation of the XANES spectral evolution. The appearance of a new phase linked to the interface regions obtained by X-ray absorption analysis suggests the granular morphology of samples with t(Fe) <= 1.3 nm.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1742-6588', '', '', '', '', '2009', '190', '', '', '', '', '', '', '012115', '10.1088/1742-6596/190/1/012115', '', '', '', '', '', '', 'WOS:0', 0, 0),
(375, '', 'J', 'Gonzalez, AG;Pokrovsky, OS;Shirokova, LS;Pokrovski, GS;Jimenez-villacorta, F;Gonzalez-da Vila, M;Santana-casiano, JM;Emnova, EE;', 'Gonzalez, A. G.; Pokrovsky, O. S.; Shirokova, L. S.; Pokrovski, G. S.; Jimenez-villacorta, F.; Gonzalez-da Vila, M.; Santana-casiano, J. M.; Emnova, E. E.', '', '', '', '', 'Speciation of Fe adsorbed on and incorporated into soil and aquatic bacteria: XAS structural study', 'GEOCHIMICA ET COSMOCHIMICA ACTA', '', '', '', '', '19th Annual VM Goldschmidt Conference', 'JUN 21, 20', 'Davos, SWITZERLAND', '', '', '', NULL, '', '', '', '', '', '', '', 0, 0, '', '', '', '0016-7037', '', '', '', 'JUN', '2009', '73', '13', '', '', '', 'A453', 'A453', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(376, '', 'J', 'Serrano, A;Pinel, EF;Quesada, A;Lorite, I;Plaza, M;Perez, L;Jimenez-Villacorta, F;de la Venta, J;Martin-Gonzalez, MS;Costa-Kramer, JL;Fernandez, JF;Llopis, J;Garcia, MA;', 'Serrano, A.; Pinel, E. Fernandez; Quesada, A.; Lorite, I.; Plaza, M.; Perez, L.; Jimenez-Villacorta, F.; de la Venta, J.; Martin-Gonzalez, M. S.; Costa-Kramer, J. L.; Fernandez, J. F.; Llopis, J.; Garcia, M. A.', '', '', '', '', 'Room-temperature ferromagnetism in the mixtures of the TiO2 and Co3O4 powders (Editor''s suggestion)', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'We report here the observation of ferromagnetism (FM) at 300 K in mixtures of TiO2 and Co3O4 powders despite the antiferromagnetic and diamagnetic characters of both oxides, respectively. The ferromagnetic behavior is found in the early stages of reaction and only for TiO2 in anatase structure; no FM is found for identical samples prepared with rutile-TiO2. Optical spectroscopy and x-ray absorption spectra confirm a surface reduction of octahedral Co+3 -> Co+2 in the mixtures which is in the origin of the observed magnetism.\r\n\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '1098-0121', '', '', '', 'APR', '2009', '79', '14', '', '', '', '', '', '144405', '10.1103/PhysRevB.79.144405', '', '', '', '', '', '', 'WOS:0', 0, 0),
(374, '', 'J', 'Faik, A;Igartua, JM;Cuello, GJ;Jimenez-Villacorta, F;Castro, GR;Lezama, L;', 'Faik, A.; Igartua, J. M.; Cuello, G. J.; Jimenez-Villacorta, F.; Castro, G. R.; Lezama, L.', '', '', '', '', 'Crystal structures and temperature-induced phase transitions of Sr2Mn2+W6+O6, and of its transformation to Sr2Mn3+W6+O6+delta', 'JOURNAL OF MOLECULAR STRUCTURE', '', '', '', '', '', '', '', '', '', '', 'We present a new effective method for synthesizing Sr2MWO6 double perovskite oxides: the co-precipitation route at 1220 K in nitrogen environment. Using conventional X-ray diffraction methods, we have confirmed the room-temperature space group of Sr2Mn2+WO6 to be P2(1)/n: Z = 2; a = 5.6764(1)angstrom; b = 5.6752(1)angstrom; c = 8.0144(1)angstrom; beta = 90.12(1)degrees and V = 258.18(1)angstrom. We show that the compound presents the following temperature induced phase-transition sequence: P2(1)/n -> l4/m -> Fm (3) over barm. After a thermal treatment, 24 h at 870 K in air, the Sr2Mn2+WO6 compound transforms irreversibly to Sr2Mn3+WO6+delta. This transformation has been confirmed by EPR and XANES measurements. Using conventional X-ray diffraction methods, we have shown the room-temperature space group of Sr2Mn3+WO6+delta to be l4/m: Z = 2; a = 5.6353(1) angstrom; c = 8.0149(1) angstrom and V = 254.53(1) angstrom(3). We show that the compound presents the following temperature induced phase-transition sequence: 14/m(-> l4/mmm) -> Fm (3) over barm. The tetragonal-to-tetragonal phase transition is suggested to be present, it is not observed as it is very weak: it is attributed to the presence of the Jahn-Teller active Mn3+ cation. (C) 2009 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0022-2860', '', '', '', 'SEP 17', '2009', '933', '1-3', '', '', '', '53', '62', '', '10.1016/j.molstruc.2009.06.008', '', '', '', '', '', '', 'WOS:0', 0, 0),
(372, '', 'J', 'Garcia, MA;Jimenez-Villacorta, F;Quesada, A;de la Venta, J;Carmona, N;Lorite, I;Llopis, J;Fernandez, JF;', 'Garcia, M. A.; Jimenez-Villacorta, F.; Quesada, A.; de la Venta, J.; Carmona, N.; Lorite, I.; Llopis, J.; Fernandez, J. F.', '', '', '', '', 'Surface magnetism in ZnO/Co3O4 mixtures', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'We recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co3O4 despite the diamagnetic and antiferromagnetic character of these oxides, respectively. Here, we present a detailed study on the electronic structure of this material in order to account for the unexpected ferromagnetism. Electrostatic interactions between both oxides lead to a dispersion of Co3O4 particles over the surface of ZnO larger ones. As a consequence, the reduction Co+3 -> Co2+ at the particle surface takes place as evidenced by x-ray absorption spectroscopy measurements and optical spectroscopy. This reduction allows explaining the observed ferromagnetic signal within the well established theories of magnetism in oxides.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'FEB 15', '2010', '107', '4', '', '', '', '', '', '043906', '10.1063/1.3294649', '', '', '', '', '', '', 'WOS:0', 0, 0),
(373, '', 'J', 'Retuerto, M;Jimenez-Villacorta, F;Martinez-Lope, MJ;Huttel, Y;Roman, E;Fernandez-Diaz, MT;Alonso, JA;', 'Retuerto, M.; Jimenez-Villacorta, F.; Martinez-Lope, M. J.; Huttel, Y.; Roman, E.; Fernandez-Diaz, M. T.; Alonso, J. A.', '', '', '', '', 'Study of the valence state and electronic structure in Sr2FeMO6 (M = W, Mo, Re and Sb) double perovskites', 'PHYSICAL CHEMISTRY CHEMICAL PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The knowledge of the oxidation state of the transition metal cations in Sr2FeMO6 (M = W, Mo, Re and Sb) double perovskites is of paramount importance to understand their appealing magnetoresistive or magnetic properties. We present a systematic investigation of the valences of Fe, W, Mo, Re and Sb cations in these perovskites using three different and complementary techniques of analysis. We have used a diffraction method, neutron powder diffraction (NPD), coupled with the bond-valence model; and two spectroscopy methods, X-ray photoemission spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). These two techniques are also complementary since XPS analyses the surface of the samples whereas XAS probes the bulk material. The analysis of the Fe K-edge spectra of the four samples shows a clear shift of the Fe K-edge as the valence of iron increases in the sequence M = W, Mo, Re and Sb. In addition, XANES pre-edge structures unveil a progressive reduction in the occupancy level of the Fe-3d band as the oxidation state of iron increases along the sequence M = W, Mo, Re and Sb. Finally, XANES computations have determined the electronic structures of Sr2FeWO6, Sr2FeMoO6, Sr2FeReO6 and Sr2FeSbO6.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1463-9076', '', '', '', '', '2010', '12', '41', '', '', '', '13616', '13625', '', '10.1039/c004370b', '', '', '', '', '', '', 'WOS:0', 0, 0),
(370, '', 'J', 'Jimenez-Villacorta, F;Munuera, C;Ocal, C;Prieto, C;', 'Jimenez-Villacorta, F.; Munuera, C.; Ocal, C.; Prieto, C.', '', '', '', '', 'Study of nanoconductive and magnetic properties of nanostructured iron films prepared by sputtering at very low temperatures', 'JOURNAL OF NANOPARTICLE RESEARCH', '', '', '', '', '', '', '', '', '', '', 'A combined study of the surface nanostructure and electrical characteristics of iron thin films prepared on naturally passivated silicon wafers is presented. By means of conductive-scanning force microscopy, the influence of the substrate temperature during film preparation on both surface morphology and conductivity response is investigated. In addition, magnetic properties of these films are reported and correlated with the nanostructural properties. Films prepared at 200 K show granular core-shell magnetic behaviour exhibiting exchange bias. Both conductive and magnetic data indicate that samples prepared at low temperature behave as a percolated network of nanometric metallic iron clusters (with typical sizes of 20 nm) interconnected by oxidized chains (of 10 nm in diameter), showing an excellent system for nanotechnological exchange bias applications.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1388-0764', '', '', '', 'MAY', '2010', '12', '4', '', '', '', '1117', '1127', '', '10.1007/s11051-009-9640-z', '', '', '', '', '', '', 'WOS:0', 0, 0),
(369, '', 'J', 'Garcia-Lopez, J;Yanez-Rodriguez, V;Roces, L;Garcia-Granda, S;Martinez, A;Guevara-Garcia, A;Castro, GR;Jimenez-Villacorta, F;Iglesias, MJ;Ortiz, FL;', 'Garcia-Lopez, Jesus; Yanez-Rodriguez, Victor; Roces, Laura; Garcia-Granda, Santiago; Martinez, Ana; Guevara-Garcia, Alfredo; Castro, German R.; Jimenez-Villacorta, Felix; Iglesias, Maria J.; Lopez Ortiz, Fernando', '', '', '', '', 'Synthesis and Characterization of a Coupled Binuclear Cu-I/Cu-III Complex', 'JOURNAL OF THE AMERICAN CHEMICAL SOCIETY', '', '', '', '', '', '', '', '', '', '', 'The synthesis through reaction of a C-alpha,C-ortho dilithiated phosphazene with CuBr and structural characterization of the first example of a binuclear mixed valence [Cu-I(N-2)/Cu-III(C-4)] complex showing a metal metal bond, as well as its applications in cyclopropanation and oxidation reactions, are described.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0002-7863', '', '', '', 'AUG 11', '2010', '132', '31', '', '', '', '10665', '10667', '', '10.1021/ja1034667', '', '', '', '', '', '', 'WOS:0', 0, 0),
(368, '', 'J', 'Gilliland, S;Segura, A;Sanchez-Royo, JF;Garcia, LM;Bartolome, F;Sans, JA;Martinez-Criado, G;Jimenez-Villacorta, F;', 'Gilliland, S.; Segura, A.; Sanchez-Royo, J. F.; Garcia, L. M.; Bartolome, F.; Sans, J. A.; Martinez-Criado, G.; Jimenez-Villacorta, F.', '', '', '', '', 'Absence of ferromagnetism in single-phase wurtzite Zn1-xMnxO polycrystalline thin films', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'This paper reports on the magnetic properties of Zn1-xMnxO with Mn concentrations from 5% to 25%. The polycrystalline films, deposited by pulsed laser deposition on c-oriented sapphire and mica substrates, were first characterized by x-ray diffraction, absorption, and fluorescence, as well as by photoelectron and optical spectroscopy. Except for the highest Mn content films, all films are single-phase wurtzite, with Mn in tetrahedral coordination. Films with 25% Mn show traces of other crystal phases with spinel or perovskite structure. Their magnetization was then measured in function of applied magnetic field in the range -5 to 5 T and temperature in the range 1.8 to 300 K. All single-phase films exhibit paramagmetic behavior in the whole temperature range. Ferri-or ferromagnetic behavior (involving only a small proportion of the total magnetization) is found only in samples with other phases or in the sapphire substrates. The paramagnetic susceptibility increases with the Mn content. However, the decrease in the mean magnetic moment per Mn atom with increasing Mn concentration and the temperature dependence of the magnetic susceptibility around 1.8 K provide strong evidence of antiferromagnetic interaction between second neighbor Mn atoms. (C) 2010 American Institute of Physics. [doi:10.1063/1.3486017]', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'OCT 1', '2010', '108', '7', '', '', '', '', '', '073922', '10.1063/1.3486017', '', '', '', '', '', '', 'WOS:0', 0, 0),
(367, '', 'J', 'Jimenez-Villacorta, F;Sanchez-Marcos, J;Cespedes, E;Garcia-Hernandez, M;Prieto, C;', 'Jimenez-Villacorta, F.; Sanchez-Marcos, J.; Cespedes, E.; Garcia-Hernandez, M.; Prieto, C.', '', '', '', '', 'Effects of interparticle interactions in magnetic Fe/Si3N4 granular systems', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'An experimental evidence of the progressive modification in the magnetic behavior of granular Fe/Si3N4 samples due to interaction effects between particles is reported. Microstructural features and local structure were determined by x-ray absorption spectroscopy and transmission electron microscopy to select granular samples with predetermined cluster size. Fe/Si3N4 systems have been characterized by ac- and demagnetization measurements to study the gradual evolution of magnetic properties of granular systems, where three different behaviors have been observed. As-deposited samples with Fe thickness layers of 2.5 nm, present a modified superparamagnetic behavior, due to very weak interactions between very small Fe clusters separated by a nonmagnetic FeN phase. An evolution of the average blocking temperature at intermediate fields (T-B similar to H-3/2) is observed, similar to noninteracting systems, but first signatures of a frozen spin state at low temperatures appear. Annealed samples exhibit a noticeable modification from the multilayer character to a random three-dimensional organization of Fe clusters embedded in a Si3N4 matrix. After annealing, samples with initial Fe layer thickness of 0.7 nm provide iron cluster in the range of 1.3 nm and exhibit a superspin-glass state, with a de Almeida-Thouless evolution of the energy barriers (T-B similar to H-2/3) that is explained in terms of increasing interparticle interactions. Moreover, annealed samples, with initial layer thickness of 1.3 nm, supply iron cluster of near 3 nm that present stronger interactions and yield a superferromagnetic state, likely provided by residual ultrasmall particles between the blocked clusters.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1098-0121', '', '', '', 'OCT 8', '2010', '82', '13', '', '', '', '', '', '134413', '10.1103/PhysRevB.82.134413', '', '', '', '', '', '', 'WOS:0', 1, 0),
(366, '', 'J', 'Aguadero, A;Retuerto, M;Jimenez-Villacorta, F;Fernandez-Diaz, MT;Alonso, JA;', 'Aguadero, A.; Retuerto, M.; Jimenez-Villacorta, F.; Fernandez-Diaz, M. T.; Alonso, J. A.', '', '', '', '', 'Evolution of cobalt spin states and magnetic coupling along the SrCo1-xSbxO3-delta system: correlation with the crystal structure', 'PHYSICAL CHEMISTRY CHEMICAL PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The oxides of the SrCo1-xSbxO3-delta perovskite family have been recently designed, characterized and described as cathode materials for solid-oxide fuel cells with competitive power performance in the temperature range 750-850 degrees C. They feature a number of interesting properties including a good electronic conductivity, low electrode polarization resistance and adequate thermal expansion; the crystal structure adopts a 3C corner-linked perovskite network with a considerable number of oxygen vacancies. This paper reports on the effects of Sb-doping on the crystal structure features, the Co oxidation state and magnetic properties related to the presence of spin-state transitions in the Co cations. A phase transition was observed from the tetragonal P4/mmm space group for x <= 0.15 to the cubic Pm (3) over barm space group in the x = 0.2 composition from neutron powder diffraction data. For the tetragonal phases the oxygen vacancies were found to be ordered and localized in the axial O2 and equatorial O3 atoms surrounding the Co2 positions. A noticeable distortion of CoO6 octahedra is observed for x = 0.05 and 0.1, exhibiting a charge-ordering with a mixed oxidation state of Co3+/(4+) at Co1 sites and Co3+ at Co2 positions: the Jahn-Teller Co3+ in an intermediate-spin configuration is responsible for the octahedral distortion. Increasing Sb contents promotes a higher average oxidation state of cobalt, from a valence of 3.2+ for x = 0.05 to 3.4+ for x = 0.2, inducing a decrease of the oxygen vacancies and favouring a random distribution over a Pm (3) over barm cubic symmetry. All the samples present an antiferromagnetic behaviour with a G-type (k = 0) magnetic structure. The increase of the Sb content induces the weakening of the crystal field (Delta(cf)) in the octahedral environment promoting the Co spin-transition from the intermediate-spin to the high-spin configuration, as evidenced by the decrease of the octahedral distortion, increment of the unit-cell volume and enhancement of the ordered magnetic moment.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1463-9076', '', '', '', '', '2011', '13', '28', '', '', '', '12835', '12843', '', '10.1039/c1cp20849g', '', '', '', '', '', '', 'WOS:0', 0, 0),
(365, '', 'J', 'Sanchez-Marcos, J;Jimenez-Villacorta, F;Cespedes, E;Munoz-Martin, A;Prieto, C;', 'Sanchez-Marcos, J.; Jimenez-Villacorta, F.; Cespedes, E.; Munoz-Martin, A.; Prieto, C.', '', '', '', '', 'Gold embedding influence on the magnetic behaviour of iron in Fe/Si3N4 multilayers prepared by sputtering', 'MATERIALS LETTERS', '', '', '', '', '', '', '', '', '', '', 'Au/Fe/Au/Si3N4 multilayers have been prepared in order to improve ferromagnetism in Fe/Si3N4 system A huge enhancement of magnetization is observed when the iron layers are embedded into gold ones showing saturation magnetization values near the bulk ones In this paper a careful microstructural study has been carried out to explain the observed magnetic behaviour of this ferromagnetic system prepared in the transparent silicon nitride matrix (C) 2010 Elsevier B V All rights reserved', '', '', '', '', '', '', '', 0, 0, '', '', '', '0167-577X', '', '', '', 'JAN 15', '2011', '65', '1', '', '', '', '13', '16', '', '10.1016/j.matlet.2010.09.046', '', '', '', '', '', '', 'WOS:0', 1, 0),
(362, '', 'J', 'Jimenez-Villacorta, F;Cespedes, E;Ocal, C;Prieto, C;', 'Jimenez-Villacorta, F.; Cespedes, E.; Ocal, C.; Prieto, C.', '', '', '', '', 'Decoupling mechanisms and magnetic stability of nanostructured iron chains prepared by sputtering', 'APPLIED PHYSICS LETTERS', '', '', '', '', '', '', '', '', '', '', 'Nanostructured Fe/Fe-oxide systems with a chain morphology formed by interconnected metallic clusters were prepared by sputtering at very low substrate temperatures. The effect of the in situ controlled oxidation at low temperature leads to an effective decoupling of the particles forming the chains, which is attributed to a physical separation of particles through formation of a core-shell metal-oxide structure. In contrast, samples oxidized at room conditions exhibit features of strongly correlated particle systems, in which magnetic decoupling and stabilization can be explained within the framework of the random anisotropy model by considering the effect of the oxide phase. (C) 2011 American Institute of Physics. [doi:10.1063/1.3559918]', '', '', '', '', '', '', '', 0, 0, '', '', '', '0003-6951', '', '', '', 'MAR 7', '2011', '98', '10', '', '', '', '', '', '102513', '10.1063/1.3559918', '', '', '', '', '', '', 'WOS:0', 1, 0),
(361, '', 'J', 'Horak, L;Matejova, J;Marti, X;Holy, V;Novak, V;Soban, Z;Mangold, S;Jimenez-Villacorta, F;', 'Horak, L.; Matejova, J.; Marti, X.; Holy, V.; Novak, V.; Soban, Z.; Mangold, S.; Jimenez-Villacorta, F.', '', '', '', '', 'Diffusion of Mn interstitials in (Ga,Mn)As epitaxial layers', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'The magnetic properties of thin (Ga,Mn) As layers improve during annealing by out-diffusion of interstitialMn ions to a free surface. Out-diffused Mn atoms participate in the growth of aMn-rich surface layer and a saturation of this layer causes an inhibition of the out-diffusion. We combine high-resolution x-ray diffraction with x-ray absorption spectroscopy and a numerical solution of the diffusion problem for the study of the out-diffusion of Mn interstitials during a sequence of annealing steps. Our data demonstrate that the out-diffusion of the interstitials is substantially affected by the internal electric field caused by an inhomogeneous distribution of charges in the (Ga,Mn) As layer.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1098-0121', '', '', '', 'JUN 28', '2011', '83', '24', '', '', '', '', '', '245209', '10.1103/PhysRevB.83.245209', '', '', '', '', '', '', 'WOS:0', 0, 0),
(360, '', 'J', 'Retuerto, M;Jimenez-Villacorta, F;Martinez-Lope, MJ;Fernandez-Diaz, MT;Alonso, JA;', 'Retuerto, Maria; Jimenez-Villacorta, Felix; Martinez-Lope, Maria J.; Fernandez-Diaz, Maria T.; Alonso, Jose A.', '', '', '', '', 'Stabilization and Study of SrFe1-xMnxO2 Oxides with Infinite-Layer Structure', 'INORGANIC CHEMISTRY', '', '', '', '', '', '', '', '', '', '', 'A series of layered oxides of nominal composition SrFe1-xMnxO2 (x = 0, 0.1, 0.2, 0.3) have been prepared by the reduction of three-dimensional perovskites SrFe1-xMnxO3-delta with CaH2 under mild temperature conditions of 583 K for 2 days. The samples with x = 0, 0.1, and 0.2 exhibit an infinite-layer crystal structure where all of the apical O atoms have been selectively removed upon reduction. A selected sample (x = 0.2) has been studied by neutron powder diffraction (NPD) and X-ray absorption spectroscopy. Both techniques indicate that Fe and Mn adopt a divalent oxidation state, although Fe2+ ions are under tensile stress whereas Mn2+ ions undergo compressive stress in the structure. The unit-cell parameters progressively evolve from a = 3.9932(4) angstrom and c = 3.4790(4) angstrom for x = 0 to a = 4.00861(15) angstrom and c = 3.46769(16) angstrom for x = 0.2; the cell volume presents an expansion across the series from V = 55.47(1) to 55.722(4) angstrom(3) for x = 0 and 0.2, respectively, because of the larger effective ionic radius of Mn2+ versus Fe2+ in four-fold coordination. Attempts to prepare Mn-rich compositions beyond x = 0.2 were unsuccessful. For SrFe0.8Mn0.2O2, the magnetic properties indicate a strong magnetic coupling between Fe2+ and Mn2+ magnetic moments, with an antiferromagnetic temperature T-N above room temperature, between 453 and 523 K, according to temperature-dependent NPD data. The NPD data include Bragg reflections of magnetic origin, accounted for with a propagation vector k=(1/2,1/2,1/2). A G-type antiferromagnetic structure was modeled with magnetic moments at the Fe/Mn position. The refined ordered magnetic moment at this position is 1.71(3)mu(B)/f.u. at 295 K. This is an extraordinary example where Mn2+ and Fe2+ ions are stabilized in a square-planar oxygen coordination within an infinite-layer structure. The layered SrFe1-xMnxO2 oxides are kinetically stable at room temperature, but in air at similar to 170 degrees C, they reoxidize and form the perovskites SrFe1-xMnxO3-delta. A cubic phase is obtained upon reoxidation of the layered compound, whereas the starting precursor SrFeO2.875 (Sr8Fe8O23) was a tetragonal superstructure of perovskite.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0020-1669', '', '', '', 'NOV 7', '2011', '50', '21', '', '', '', '10929', '10936', '', '10.1021/ic201488w', '', '', '', '', '', '', 'WOS:0', 0, 0),
(359, '', 'J', 'Jimenez-Villacorta, F;Prieto, C;Huttel, Y;Telling, ND;van der Laan, G;', 'Jimenez-Villacorta, F.; Prieto, C.; Huttel, Y.; Telling, N. D.; van der Laan, G.', '', '', '', '', 'X-ray magnetic circular dichroism study of the blocking process in nanostructured iron-iron oxide core-shell systems', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'Experimental evidence for magnetothermal behavior in iron-iron oxide nanostructured systems has been obtained using x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) at the Fe L(2,3) edges. The purpose of this study is the determination of the blocked state in these spin-glass-like core-shell systems. A first overview of the magnetic species participating in the magnetic response was obtained by analyzing the XMCD at saturating fields. Also, the XAS revealed the existence of an antiferromagnetic FeO phase, likely located at the interface regions. Finally, measurements were performed at low temperature and intermediate field, where a frozen state below the blocking energy is observed. The results show that the oxide phase spins are oriented at low temperature, while the magnetic spins of the metallic core do not contribute to the XMCD, suggesting that the blocking process mainly involves the magnetic particle superspins rather than the oxide coverage phase.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1098-0121', '', '', '', 'NOV 15', '2011', '84', '17', '', '', '', '', '', '172404', '10.1103/PhysRevB.84.172404', '', '', '', '', '', '', 'WOS:0', 1, 0),
(358, '', 'J', 'Sanchez-Marcos, J;Laguna-Marco, MA;Martinez-Morillas, R;Cespedes, E;Jimenez-Villacorta, F;Menendez, N;Prieto, C;', 'Sanchez-Marcos, Jorge; Angeles Laguna-Marco, M.; Martinez-Morillas, Rocio; Cespedes, Eva; Jimenez-Villacorta, Felix; Menendez, Nieves; Prieto, Carlos', '', '', '', '', 'Exchange bias in iron oxide nanoclusters', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'Iron oxide nanoclusters have been prepared by the gas-phase aggregation technique to form thin film structures with very high exchange bias values (up to 3000 Oe at low temperatures). Composition has been analysed by x-ray absorption and Mossbauer spectroscopies in order to elucidate the actual origin of the observed magnetic behaviour. The formation of a metal-oxide core-shell arrangement to explain the observed exchange bias has to be discarded since results show no metallic iron content and the main presence of alpha-Fe2O3. The observed weak ferromagnetism and exchange bias are in agreement with the obtained size of alpha-Fe2O3 nanoparticles: weak ferromagnetism because of the well-known spin canting in this antiferromagnetic structure and exchange bias because of the interaction between different spin sublattice configurations promoted by the modification of iron coordination in alpha-Fe2O3 nanoparticles. Moreover, the preparation method is proposed for tuning both magnetization and exchange bias values by modification of the preparation conditions of alpha-Fe2O3 nanoparticles, which open new possibilities in the design of new materials with required properties.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0953-8984', '', '', '', 'NOV 30', '2011', '23', '47', '', '', '', '', '', '476003', '10.1088/0953-8984/23/47/476003', '', '', '', '', '', '', 'WOS:0', 1, 0),
(357, '', 'J', 'Jimenez-Villacorta, F;Espinosa, A;Cespedes, E;Prieto, C;', 'Jimenez-Villacorta, F.; Espinosa, A.; Cespedes, E.; Prieto, C.', '', '', '', '', 'Magnetic properties and short-range structure analysis of granular cobalt silicon nitride multilayers', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The magnetic properties and local order of cobalt/silicon nitride metal-insulator multilayered system have been studied. Magnetization characterization reveals an evolution of the magnetic features by varying the metal layer thickness. Results show that multilayers with larger metal thickness (t) present a pure ferromagnetic character, whereas samples with t < 2 nm exhibit a granular superparamagnetic behavior, as it corresponds to discontinuous metal-insulator materials. An important decrease in the magnetization values for the clustered samples has also been observed. X-ray absorption near edge spectroscopy (XANES) and extended x-ray absorption fine structure (EXAFS) at the Co K-edge have been used to determine the local order and electronic configuration around cobalt. Results reveal the formation of an intermediate CoN phase likely located at the Co/Si(3)N(4) interface. Further insight in the electronic structure of cobalt atoms has been investigated through ab-initio XANES calculations based on Green function''s multiple scattering formalism. Local-projected density of states (l-DOS) obtained by simultaneous computations has unveiled the effects of the nitrogen coordination in the electronic structure of the metal atom around the Fermi energy. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3665877]', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'DEC 1', '2011', '110', '11', '', '', '', '', '', '113909', '10.1063/1.3665877', '', '', '', '', '', '', 'WOS:0', 1, 0),
(356, '', 'J', 'Cespedes, E;Laguna-Marco, MA;Jimenez-Villacorta, F;Chaboy, J;Boada, R;Guglieri, C;de Andres, A;Prieto, C;', 'Cespedes, E.; Laguna-Marco, M. A.; Jimenez-Villacorta, F.; Chaboy, J.; Boada, R.; Guglieri, C.; de Andres, A.; Prieto, C.', '', '', '', '', 'On the Origin of the Magnetism of Mn-Zn-O Systems: Structural, Electronic, and Magnetic Study of Exotic MnO2-delta/ZnO Thin Films', 'JOURNAL OF PHYSICAL CHEMISTRY C', '', '', '', '', '', '', '', '', '', '', 'The structural, electronic, and magnetic characterization of sputtered MnO2-delta/ZnO films showing room temperature ferromagnetism has been carried out by a number of techniques. To elucidate the origin of the ferromagnetic order, a novel approach by studying XAS and XMCD signals at both Mn and Zn K edges in combination with the macroscopic magnetization measurements has been performed. The analysis of the XAS profile at the Mn edge indicates the coexistence of Mn4+/Mn3+ with a slightly distorted MnO2-delta environment. The XMCD signal at the Zn K edge indicates the existence of an intrinsic magnetic moment in Zn. The Zn edge dichroic intensity is, however, 1 order of magnitude lower than in the case of Mn, being the magnetic moment of Mn, 2.1-2.4 mu(B) per Mn cation participating in the ferromagnetic phase, the main contribution to the total magnetization. The ferromagnetic phase has been assigned to high-density regions of Mn cations with a MnO2-delta distorted environment, mainly allocated at the nonstoichiometric and highly defective ZnO grain boundaries, with a sufficient extension to overcome the thermal energy over room temperature. The ferromagnetic coupling has been related to modifications of the Mn-O-Mn bonds, distances, and angles, promoted by neighboring ZnO and forming stable magnetic configurations that lead to new forms of exchange interaction: ferromagnetic superexchange or a double-exchange mechanism between the Mn4+ and Mn3+. Highly defective regions and structural distortions, together with complex Mn oxidation states, appear to be key features in the magnetic properties of Mn-Zn-O.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1932-7447', '', '', '', 'DEC 15', '2011', '115', '49', '', '', '', '24092', '24101', '', '10.1021/jp208929w', '', '', '', '', '', '', 'WOS:0', 1, 0),
(355, '', 'J', 'Jimenez-Villacorta, F;Marion, JL;Sepehrifar, T;Daniil, M;Willard, MA;Lewis, LH;', 'Jimenez-Villacorta, F.; Marion, J. L.; Sepehrifar, T.; Daniil, M.; Willard, M. A.; Lewis, L. H.', '', '', '', '', 'Exchange anisotropy in the nanostructured MnAl system', 'APPLIED PHYSICS LETTERS', '', '', '', '', '', '', '', '', '', '', 'In this letter, we report on the achievement of exchange anisotropy magnitude in a nanostructured Mn55Al45 alloy fabricated by rapid solidification with large exchange bias values (H-E approximate to 13 kOe at 10K) and a blocking temperature of T-B similar to 95 K. Field-cooled magnetization loops show a prominent exchange bias for T < T-B signaling the simultaneous presence of antiferromagnetic and ferromagnetic phases at these temperatures. Structural probes confirm a majority presence of the high-temperature metastable hexagonal epsilon-MnAl in the as-solidified state with an intriguing double-Bragg peak structure indicative of phase separation. The observed exchange bias is hypothesized to originate from an intimate mixture of antiferromagnetic and nanoscaled ferromagnetic phases or dual mictomagnetic phases, approximating a cluster glass with well-defined variations in the local Mn concentration of the composition and leading to Mn-rich and Mn-poor regions with antiferromagnetic and ferromagnetic characters, respectively. (C) 2012 American Institute of Physics. [http://dx.org/10.1063/1.3695153]', '', '', '', '', '', '', '', 0, 0, '', '', '', '0003-6951', '', '', '', 'MAR 12', '2012', '100', '11', '', '', '', '', '', '112408', '10.1063/1.3695153', '', '', '', '', '', '', 'WOS:0', 0, 0),
(353, '', 'J', 'Retuerto, M;Martinez-Lope, MJ;Krezhov, K;Ruskov, T;Spirov, I;Krystev, P;Jimenez-Villacorta, F;Fernandez-Diaz, MT;Alonso, JA;', 'Retuerto, M.; Martinez-Lope, M. J.; Krezhov, K.; Ruskov, T.; Spirov, I.; Krystev, P.; Jimenez-Villacorta, F.; Fernandez-Diaz, M. T.; Alonso, J. A.', '', '', '', '', 'Mixed valence of iron inside tetrahedral and pseudopyramids in BiFe2O5-delta', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'An oxide of stoichiometry BiFe2O5-delta has been prepared by thermal treatments under high oxygen pressure. The crystallographic structure has been determined by neutron powder diffraction (NPD); it is defined in an orthorhombic structure (space group Pbam) with the Fe cations in octahedral and tetrahedral sites, similar to the previously reported BiFe2O4.5. Nevertheless, by Fourier synthesis a non-negligible occupancy of oxygen anions in interstitial positions has been determined, corresponding to a final stoichiometry BiFe2O4.63(1). It implies that some tetrahedral Fe environments are transformed into pseudo pyramids and thus, some Fe cations are oxidized to a 4+ oxidation state. We have confirmed the mixed valence of Fe by Mossbauer and x-ray-absorption spectroscopy obtaining similar to Fe3.2+ by both techniques. In addition, the magnetic structure below the magnetic ordering transition, around T-N = 250 K, has also been determined by NPD. It is antiferromagnetic with a propagation vector of k = (1/2,1/2,1/2) and ordered magnetic moments of 4.6(1) mu(B) at Fe in octahedral positions and 3.7(1) mu(B) at Fe in pyramidal/tetrahedral positions.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1098-0121', '', '', '', 'MAY 7', '2012', '85', '17', '', '', '', '', '', '174406', '10.1103/PhysRevB.85.174406', '', '', '', '', '', '', 'WOS:0', 0, 0),
(354, '', 'J', 'Jimenez-Villacorta, F;Marion, JL;Sepehrifar, T;Lewis, LH;', 'Jimenez-Villacorta, F.; Marion, J. L.; Sepehrifar, T.; Lewis, L. H.', '', '', '', '', 'Tuning exchange anisotropy in nanocomposite AgMn alloys', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Silver manganese alloys of composition Ag100-xMnx (25 <= x <= 40) were prepared by rapid solidification to investigate their reported antiferromagnetic character. Thorough characterization of their structural, compositional, and magnetic features indicates the formation of a phase-separated fcc-type structure in all studied alloys with lattice parameters and coherently diffracting region sizes on the order of 40-100 nm that are strongly correlated with the Mn content. Magnetic measurement reveals a blocking temperature T-B similar to 105 K that is accompanied by unprecedented exchange bias values up to 1.7 T (17 kOe) at low temperatures. The magnitudes of the exchange bias field and the blocking temperature increase with increasing Mn concentration, suggesting a very sensitive balance between Mn content and magnetic character in these alloys that fosters tuning of the resultant exchange bias. (C) 2012 American Institute of Physics. [doi:10.1063/1.3679048]', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'APR 1', '2012', '111', '7', '', '', '', '', '', '07E141', '10.1063/1.3679048', '', '', '', '', '', '', 'WOS:0', 0, 0),
(352, '', 'J', 'Jimenez-Villacorta, F;Gallastegui, JA;Fina, I;Marti, X;Fontcuberta, J;', 'Jimenez-Villacorta, F.; Gallastegui, J. A.; Fina, I.; Marti, X.; Fontcuberta, J.', '', '', '', '', 'Strain-driven transition from E-type to A-type magnetic order in YMnO3 epitaxial films', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'Single-crystal (100)-oriented YMnO3 thin films grown on (110)-oriented SrTiO3 substrates have been studied by polarized extended x-ray absorption fine structure to determine the Mn-O bond lengths. Using a simple geometrical model and previously reported x-ray diffraction data on the same samples, the Mn-O-Mn bonding angles are calculated. We show that the epitaxy-induced in-plane anisotropic strain has a dramatic impact on the bonding angles, allowing the rationalization of the reported existence of cycloidalmagnetic order and concomitant ferroelectricity in moderately strained films and the gradual suppression by larger strains. We shall argue that epitaxial strain allows shifting YMnO3 from an E-type to A-type antiferromagnetic ground state, crossing a cycloidal magnetic region.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1098-0121', '', '', '', 'JUL 16', '2012', '86', '2', '', '', '', '', '', '024420', '10.1103/PhysRevB.86.024420', '', '', '', '', '', '', 'WOS:0', 0, 0),
(350, '', 'J', 'Sanchez-Marcos, J;Laguna-Marco, MA;Martinez-Morillas, R;Jimenez-Villacorta, F;Cespedes, E;Menendez, N;Prieto, C;', 'Sanchez-Marcos, J.; Laguna-Marco, M. A.; Martinez-Morillas, R.; Jimenez-Villacorta, F.; Cespedes, E.; Menendez, N.; Prieto, C.', '', '', '', '', 'Exchange bias and magnetic behaviour of iron nanoclusters prepared by the gas aggregation technique', 'JOURNAL OF ALLOYS AND COMPOUNDS', '', '', '', '', '', '', '', '', '', '', 'Iron nanoclusters have been deposited by the gas-phase aggregation technique to form multilayered structures with outstanding exchange-bias (H-E) values up to H-E = 3300 Oe at low temperatures. In order to explain the observed magnetic properties, composition and crystallographic phase have been determined by X-ray absorption spectroscopy. A metal-oxide core-shell arrangement has to be discarded to explain the large obtained values of H-E since structural results show nanoclusters formed by the antiferromagnetic alpha-Fe2O3 oxide. Moreover, nanoparticles of few nanometers formed by substoichiometric alpha-Fe2O3 explain the observed weak ferromagnetism and let to understand the origin of large exchange bias by the interaction between different spin sublattice configurations provided by the low iron coordination at surface. (c) 2011 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0925-8388', '', '', '', 'SEP 25', '2012', '536', '', '', '', '1', 'S265', 'S270', '', '10.1016/j.jallcom.2011.12.006', '', '', '', '', '', '', 'WOS:0', 1, 0),
(351, '', 'J', 'Loving, M;de Vries, MA;Jimenez-Villacorta, F;Le Graet, C;Liu, X;Fan, R;Langridge, S;Heiman, D;Marrows, CH;Lewis, LH;', 'Loving, M.; de Vries, M. A.; Jimenez-Villacorta, F.; Le Graet, C.; Liu, X.; Fan, R.; Langridge, S.; Heiman, D.; Marrows, C. H.; Lewis, L. H.', '', '', '', '', 'Tailoring the FeRh magnetostructural response with Au diffusion', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Factors which contribute to magnetostructural transition control have been demonstrated by study of the effects of Au incorporation on the magnetic and structural character of CsCl-structured equiatomic FeRh thin films. Sputtered films were capped with 2 nm of Au deposited at 873K and at 323K and subsequently characterized with magnetometry and synchrotron-based structural probes. Diffusion of Au into the FeRh film layer at 873K is confirmed by a reduction in the Au capping layer thickness relative to the film capped at 323 K. The impact of Au diffusion on the FeRh magnetostructural character is noted by a decrease in the onset of the transition temperature, a thermally broadened first-order transition and an increased sensitivity of the transition to applied magnetic field. Additionally, magnetization data indicate that Au diffusion causes retention of the ferromagnetic phase well below the normal magnetostructural transition temperature. These results are attributed to a multiphase FeRh film layer created by thermally driven Au diffusion. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4747921]', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'AUG 15', '2012', '112', '4', '', '', '', '', '', '043512', '10.1063/1.4747921', '', '', '', '', '', '', 'WOS:0', 0, 0),
(349, '', 'J', 'Sanchez-Marcos, J;Laguna-Marco, MA;Martinez-Morillas, R;Cespedes, E;Menendez, N;Jimenez-Villacorta, F;Prieto, C;', 'Sanchez-Marcos, J.; Laguna-Marco, M. A.; Martinez-Morillas, R.; Cespedes, E.; Menendez, N.; Jimenez-Villacorta, F.; Prieto, C.', '', '', '', '', 'X-Ray Absorption and Mossbauer Spectroscopies Characterization of Iron Nanoclusters Prepared by the Gas Aggregation Technique', 'JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY', '', '', '', '', '', '', '', '', '', '', 'Partially oxidized iron nanoclusters have been prepared by the gas-phase aggregation technique with typical sizes of 2-3 nm. This preparation technique has been reported to obtain clusters with interesting magnetic properties such as very large exchange bias. In this paper, a sample composition study carried out by Mossbauer and X-ray absorption spectroscopies is reported. The information reached by these techniques, which is based on the iron short range order, results to be an ideal way to have a characterization of the whole sample since the obtained data are an average over a very large amount of the clusters. In addition, our results indicate the presence of ferrihydrite, which is a compound typically ignored when studying this type of systems.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1533-4880', '', '', '', 'NOV', '2012', '12', '11', '', '', '', '8619', '8623', '', '10.1166/jnn.2012.6822', '', '', '', '', '', '', 'WOS:0', 1, 0),
(348, '', 'J', 'Lewis, LH;Jimenez-Villacorta, F;', 'Lewis, Laura H.; Jimenez-Villacorta, Felix', '', '', '', '', 'Perspectives on Permanent Magnetic Materials for Energy Conversion and Power Generation (Review Article)', 'METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE', '', '', '', '', '', '', '', '', '', '', 'Permanent magnet development has historically been driven by the need to supply larger magnetic energy in ever smaller volumes for incorporation in an enormous variety of applications that include consumer products, transportation components, military hardware, and clean energy technologies such as wind turbine generators and hybrid vehicle regenerative motors. Since the 1960s, the so-called rare-earth "supermagnets," composed of iron, cobalt, and rare-earth elements such as Nd, Pr, and Sm, have accounted for the majority of global sales of high-energy-product permanent magnets for advanced applications. In rare-earth magnets, the transition-metal components provide high magnetization, and the rare-earth components contribute a very large magnetocrystalline anisotropy that donates high resistance to demagnetization. However, at the end of 2009, geopolitical influences created a worldwide strategic shortage of rare-earth elements that may be addressed, among other actions, through the development of rare-earth-free magnetic materials harnessing sources of magnetic anisotropy other than that provided by the rare-earth components. Materials engineering at the micron scale, nanoscale, and Angstrom scales, accompanied by improvements in the understanding and characterization of nanoscale magnetic phenomena, is anticipated to result in new types of permanent magnetic materials with superior performance. DOI: 10.1007/s11661-012-1278-2 (C) The Minerals, Metals & Materials Society and ASM International 2012\r\n\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '1073-5623', '', '', '', 'JAN', '2013', '44A', '', '', '', '1', '2', '20', '', '10.1007/s11661-012-1278-2', '', '', '', '', '', '', 'WOS:0', 0, 0),
(347, '', 'J', 'Jimenez-Villacorta, F;Heiman, D;Marion, JL;Lewis, LH;', 'Jimenez-Villacorta, F. Vill; Heiman, D.; Marion, J. L.; Lewis, L. H.', '', '', '', '', 'Tailored Exchange in Binary Manganese-Noble Metal Alloys', 'IEEE MAGNETICS LETTERS', '', '', '', '', '', '', '', '', '', '', 'A general phenomenological model is presented that predicts the evolution of magnetic order and transition temperatures found in binary noble metal (NM) alloys with high Mn content. The model is derived from magnetic measurements and analysis of rapidly solidified Ag1-xMnx (0.25 <= x <= 0.4) alloys, also describing the magnetic attributes of CuMn and AuMn alloys, as reported in the literature. Mn atomic substitution in the face-centered-cubic noble metal lattice results in a tunable average Mn-Mn characteristic interatomic distance estimated from the average Mn concentration that governs the evolution of the magnetic ordering temperature. This evolution is found to be a consequence of the competition between positive ferromagnetic (FM) and negative antiferromagnetic (AF) interatomic exchange coupling revealing a Bethe-Slater-type behavior. Considering the composition range analyzed in this letter and the previous literature (x = 0.02-0.40), the ordering temperature is maximized at x approximate to 0.17 for Ag-Mn and Cu-Mn alloys, with a progressive decrease at higher Mn concentration that is indicative of an increasing AF character. These predictive results enable the development of potential pathways to manipulate and tailor magnetic attributes in Mn-based alloys that are of current interest for tunable exchange-biased systems.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1949-307X', '', '', '', '', '2013', '4', '', '', '', '', '', '', '1000204', '10.1109/LMAG.2013.2279513', '', '', '', '', '', '', 'WOS:0', 0, 0),
(172, '', 'S', 'Carmona, N;Bouzas, V;de la Morena, JJ;Garcia, MA;', 'Carmona, N.; Bouzas, V.; Jimenez de la Morena, J.; Garcia, M. A.', '', '', '', 'Borsella, E', 'Miniaturized Devices For Au Nanorods Detection', 'BONSAI PROJECT SYMPOSIUM: BREAKTHROUGHS IN NANOPARTICLES FOR BIO-IMAGING', 'AIP Conference Proceedings', '', '', '', 'Bonsai Project Symposium on Breakthroughs in Nanoparticles for Bio-Imaging', 'APR 08-09,', 'Rome, ITALY', 'ENEA, CEA, UCM, CSIC, Univ Padova, MPIKG & MPIA, Univ Milano Bicocca, GUERBET, GPI NSC, Univ Freibur', 'ENEA Res Ctr Frascati', '', 'We present here some miniaturised devices designed for the detection of nanorods in water and blood media. The devices use light emitting diodes as monochromatic light sources and Si photodiodes for detection. Devices working on transmission mode are able to detect nanorods concentration below micrograms/litre. Sensitivity is reduced is one or of magnitude for nanorods in blood. We show detection of low nanorods concentration with devices working in reflection mode, opening the possibility to perform direct imaging of nanorods in vivo. The optima condition for detection and resolution limits are also discussed.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0094-243X', '978-0-7354-0826-5', '', '', '', '2010', '1275', '', '', '', '', '158', '161', '', '10.1063/1.3505068', '', '', '', '', '', '', 'WOS:0', 0, 0),
(345, '', 'J', 'Salas, E;Jimenez-Villacorta, F;Sanchez-Marcos, J;Rioboo, RJJ;Munoz-Martin, A;Prieto, JE;Joco, V;Prieto, C;', 'Salas, E.; Jimenez-Villacorta, F.; Sanchez-Marcos, J.; Jimenez Rioboo, R. J.; Munoz-Martin, A.; Prieto, J. E.; Joco, V.; Prieto, C.', '', '', '', '', 'Elastic properties of boron carbide films via surface acoustic waves measured by Brillouin light scattering', 'PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE', '', '', '', '', '', '', '', '', '', '', 'Surface acoustic wave (SAW) velocity has been determined by high resolution Brillouin light scattering to study the mechano-elastic properties of boron carbide films prepared by radio frequency (RF) sputtering. The comparison of experimentally observed elastic behaviour with simulations made by considering film composition obtained from elastic recoil detection analysis-time of flight (ERDA-ToF) spectroscopy allows establishing that elastic properties are determined by that of crystalline boron carbide with a lessening of the SAW velocity values due to surface oxidation.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1862-6300', '', '', '', 'MAR', '2013', '210', '3', '', '', '', '513', '518', '', '10.1002/pssa.201228461', '', '', '', '', '', '', 'WOS:0', 1, 0),
(346, '', 'J', 'Barua, R;Jiang, XJ;Jimenez-Villacorta, F;Shield, JE;Heiman, D;Lewis, LH;', 'Barua, Radhika; Jiang, Xiujuan; Jimenez-Villacorta, Felix; Shield, J. E.; Heiman, D.; Lewis, L. H.', '', '', '', '', 'Tuning the magnetostructural phase transition in FeRh nanocomposites', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Effects of nanostructuring on the magnetostructural response of the near-equiatomic FeRh phase were investigated in nanocomposite materials synthesized by rapid solidification and subsequent annealing of an alloy of nominal atomic composition (FeRh)(5)Cu-95. Transmission electron microscopy studies confirm attainment of a phase-separated system of nanoscaled (similar to 10-15 nm diameter) precipitates, consistent with FeRh embedded in a Cu matrix. These nanoprecipitates are crystallographically aligned with the coarse-grained Cu matrix and possess an L1(0)-type (CuAu 1) structure, in contrast to the B2 (CsCl)-type structure of bulk FeRh. It is proposed that the face-centered cubic crystal structure of the Cu matrix serves as a template for the formation and stabilization of the L1(0) structure in the FeRh nanoprecipitates. Magnetic measurements highlight the existence of multiple magnetic phases in the material exhibiting spin-glass (T <= 15 K), ferromagnetic and paramagnetic (T > 20 K) behavior. A thermally hysteretic magnetic transition, remarkably similar to the magnetostructural transition of bulk CsCl-type FeRh reported at T-t = 370 K, is observed in the nanostructured material at 130 K. This result not only emphasizes the sensitivity of the magnetic and structural properties of FeRh to changes in microstructural scale, but also highlights the potential for tailoring magnetostructural transitions in functional materials systems via nanostructuring. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4774282]', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'JAN 14', '2013', '113', '2', '', '', '', '', '', '023910', '10.1063/1.4774282', '', '', '', '', '', '', 'WOS:0', 0, 0),
(344, '', 'J', 'Loving, M;Jimenez-Villacorta, F;Kaeswurm, B;Arena, DA;Marrows, CH;Lewis, LH;', 'Loving, M.; Jimenez-Villacorta, F.; Kaeswurm, B.; Arena, D. A.; Marrows, C. H.; Lewis, L. H.', '', '', '', '', 'Structural evidence for stabilized ferromagnetism in epitaxial FeRh nanoislands (Editor''s selection - Highlights of 2013)', 'JOURNAL OF PHYSICS D-APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Nanoislands of alpha''-FeRh were formed by the deposition of a 10 nm film onto (0 0 1)-MgO and observed by atomic force microscopy. This island-like architecture results in stabilized ferromagnetic (FM) ordering at low temperatures as noted by asymmetry in the x-ray diffraction peaks, a magnetostructural transition with a large magnetic background signal, and broad thermal hysteresis. The combination of structural and magnetic results suggest that the crystallographic arrangement of the FeRh nanoislands consists of a gradient of lattice parameters where there is a compressed inner region of lower lattice parameter values (attributed to antiferromagnetic ordering) which gradually relaxes outward to a region of larger lattice parameters (attributed to a retained FM ordering). The impact of this configuration on magnetostructural transformation is discussed in the context of classical nucleation theory.\r\n\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '0022-3727', '', '', '', 'APR 24', '2013', '46', '16', '', '', '', '', '', '162002', '10.1088/0022-3727/46/16/162002', '', '', '', '', '', '', 'WOS:0', 0, 0),
(342, '', 'J', 'Sanchez-Marcos, J;Cespedes, E;Jimenez-Villacorta, F;Munoz-Martin, A;Prieto, C;', 'Sanchez-Marcos, J.; Cespedes, E.; Jimenez-Villacorta, F.; Munoz-Martin, A.; Prieto, C.', '', '', '', '', 'Gold-coated iron nanoparticles in transparent Si3N4 matrix thin films', 'JOURNAL OF NANOPARTICLE RESEARCH', '', '', '', '', '', '', '', '', '', '', 'A new method to prepare thin films containing gold-coated iron nanoparticles is presented. The ternary Fe-Au-Si3N4 system prepared by sequential sputtering has revealed a progressive variation of microstructures from Au/Fe/Au/Si3N4 multilayers to iron nanoparticles. Microstructural characterization by transmission electron microscopy, analysis of the magnetic properties and probing of the iron short-range order by X-ray absorption spectroscopy confirm the existence of a gold-coated iron nanoparticles of 1-2 nm typical size for a specific range of iron and gold contents per layer in the transparent silicon nitride ceramic matrix.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1388-0764', '', '', '', 'JUN', '2013', '15', '6', '', '', '', '', '', '1714', '10.1007/s11051-013-1714-2', '', '', '', '', '', '', 'WOS:0', 1, 0),
(343, '', 'J', 'Barua, R;Jimenez-Villacorta, F;Shield, JE;Heiman, D;Lewis, LH;', 'Barua, Radhika; Jimenez-Villacorta, Felix; Shield, J. E.; Heiman, D.; Lewis, L. H.', '', '', '', '', 'Nanophase stability in a granular FeRh-Cu system', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '12th Joint MMM-Intermag Conference', 'JAN 14-18,', 'Chicago, IL', 'AIP Publishing, IEEE Magnet Soc', '', '', 'A granular system of FeRh-based nanoprecipitates (similar to 10-15 nm diameter) embedded in a rapidly solidified copper ribbon matrix was found to transit from a metastable tetragonal L1(0) (AuCu-1-type) structure to a stable B2 (CsCl-type) structure upon annealing-induced coarsening to similar to 94 nm. The hysteretic magnetic transition observed at similar to 100 K develops a gradual broadening that accompanies the L1(0) -> B2 crystal structure transition. It is proposed that the Cu matrix influences the structural and magnetic properties of the FeRh-based nanoparticles through interfacial strain and chemical effects. These results emphasize the sensitivity of the magnetostructural response of FeRh to changes in the nanostructural scale, and provide pathways for tailoring the transition. (C) 2013 AIP Publishing LLC.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'MAY 7', '2013', '113', '17', '', '', '', '', '', '17B523', '10.1063/1.4800742', '', '', '', '', '', '', 'WOS:0', 0, 0),
(340, '', 'J', 'Barua, R;Jimenez-Villacorta, F;Lewis, LH;', 'Barua, Radhika; Jimenez-Villacorta, Felix; Lewis, L. H.', '', '', '', '', 'Predicting magnetostructural trends in FeRh-based ternary systems', 'APPLIED PHYSICS LETTERS', '', '', '', '', '', '', '', '', '', '', 'Correlations between magnetic transition temperatures and the average weighted valence band electron concentration ((s+d) electrons/atom) have led to the development of a phenomenological model that predicts the influence of elemental substitution on the magnetostructural response of bulk B2-ordered Fe(Rh1-xMx) or (Fe1-xMx)Rh alloys (M = transition elements; x < 6 at. %). Validation of this model is provided through synthesis and characterization of FeRh with Cu and Au additions. The data and associated trends indicate that the lattice and electronic free energies are both equally important in driving the magnetostructural transition in the bulk FeRh system. (C) 2013 AIP Publishing LLC.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0003-6951', '', '', '', 'SEP 2', '2013', '103', '10', '', '', '', '', '', '102407', '10.1063/1.4820583', '', '', '', '', '', '', 'WOS:0', 0, 0),
(339, '', 'J', 'Salas, E;Rioboo, RJJ;Sanchez-Marcos, J;Jimenez-Villacorta, F;Munoz-Martin, A;Prieto, JE;Joco, V;Prieto, C;', 'Salas, E.; Jimenez Rioboo, R. J.; Sanchez-Marcos, J.; Jimenez-Villacorta, F.; Munoz-Martin, A.; Prieto, J. E.; Joco, V.; Prieto, C.', '', '', '', '', 'Elastic properties of B-C-N films grown by N-2-reactive sputtering from boron carbide targets', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Boron-carbon-nitrogen films were grown by RF reactive sputtering from a B4C target and N-2 as reactive gas. The films present phase segregation and are mechanically softer than boron carbide films (a factor of more than 2 in Young''s modulus). This fact can turn out as an advantage in order to select buffer layers to better anchor boron carbide films on substrates eliminating thermally induced mechanical tensions. (C) 2013 AIP Publishing LLC.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'DEC 7', '2013', '114', '21', '', '', '', '', '', '213508', '10.1063/1.4837655', '', '', '', '', '', '', 'WOS:0', 1, 0),
(338, '', 'J', 'Kaeswurm, B;Jimenez-Villacorta, F;Bennett, SP;Heiman, D;Lewis, LH;', 'Kaeswurm, B.; Jimenez-Villacorta, F.; Bennett, S. P.; Heiman, D.; Lewis, L. H.', '', '', '', '', 'Nanostructured Fe Rh in metallic and insulating films', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', '', '', '', '', '', '', '', '', 'The formation of nanostructured FeRh in nonmagnetic metallic and insulating matrices is investigated and correlated with their structural and magnetic properties, with the goal of clarifying synthesis-structure-property relationships in confined geometries. Films containing FeRh with Al2O3 and Cu matrices were deposited on Si substrates using RF sputtering and then annealed up to 1073 K to form chemically-ordered FeRh particles with the B2 structure. FeRh nanostructures formed within the refractory Al2O3 matrix are rounded in shape and have a smaller average particle size of 60 nm, compared to the more irregular nanostructures obtained in the metallic Cu-FeRh sample with a larger average particle size similar to 150 nm The different morphology of the two samples is explained in terms of the dissimilar properties of the matrices, and opens pathways for potential control of the fabrication of FeRh nanostructures. (C) 2013 Elsevier B.V. All rights reserved', '', '', '', '', '', '', '', 0, 0, '', '', '', '0304-8853', '', '', '', 'MAR', '2014', '354', '', '', '', '', '284', '289', '', '10.1016/j.jmmm.2013.11.011', '', '', '', '', '', '', 'WOS:0', 0, 0),
(337, '', 'J', 'Ferrer, P;Jimenez-Villacorta, F;Rubio-Zuazo, J;da Silva, I;Castro, GR;', 'Ferrer, P.; Jimenez-Villacorta, F.; Rubio-Zuazo, J.; da Silva, I.; Castro, G. R.', '', '', '', '', 'Environmental Influence on Zn-Histidine Complexes under No-Packing Conditions', 'JOURNAL OF PHYSICAL CHEMISTRY B', '', '', '', '', '', '', '', '', '', '', 'This paper describes a combined structural analysis of the Zn-histidine complex, using two different and complementary techniques, X-ray absorption spectroscopy (XAS) and surface X-ray diffraction, paying special attention to the environmental conditions. The current procedure for investigating macromolecules consists of examining simple molecules that exhibit properties similar to those of the larger ones, whose functionality is totally related to the atomic structure. The detailed study of the bonding structure formed by zinc and histidine amino acids is motivated by the fact that this material serves as a model for metalloproteins, such as in metalloproteinase, acting as active sites in enzymatic or structural functions. For XAS modeling, Zn-histidine complexes were dissolved in several aqueous solutions, over a wide pH range. Correlations among the degree of protonation, the steric impediment, and the multiple combinations of the histidine amino acid have been found. For the diffraction study, high-quality crystals grown by the seeding method in a supersaturated solution have been studied, and the samples for the surface diffraction study were mounted on a cell specially designed for solid-liquid or solid-gas interface analysis. The surface structural model was built from XAS results. In both cases, the obtained structures are compared with the bulk one, showing atomic differences and highlighting the importance of the environment in which the complex is studied.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1520-6106', '', '', '', 'MAR 20', '2014', '118', '11', '', '', '', '2842', '2850', '', '10.1021/jp411655e', '', '', '', '', '', '', 'WOS:0', 0, 0),
(336, '', 'J', 'Gonzalez, AG;Pokrovsky, OS;Jimenez-Villacorta, F;Shirokova, LS;Santana-Casiano, JM;Gonzalez-Davila, M;Emnova, EE;', 'Gonzalez, A. G.; Pokrovsky, O. S.; Jimenez-Villacorta, F.; Shirokova, L. S.; Santana-Casiano, J. M.; Gonzalez-Davila, M.; Emnova, E. E.', '', '', '', '', 'Iron adsorption onto soil and aquatic bacteria: XAS structural study', 'CHEMICAL GEOLOGY', '', '', '', '', '', '', '', '', '', '', 'Although the interaction between Fe and microorganisms has been extensively studied, the main physicochemical factors controlling the mechanisms of Fe adsorption and precipitation on bacterial cell walls remain poorly understood. In this study, we quantified thermodynamic parameters of the Fe adsorption reaction and characterized the speciation of Fe adsorbed on the surface of cyanobacteria and soil heterotrophic bacteria. For this purpose, the molecular mechanisms of iron interaction with typical aquatic and soil bacteria were investigated by combining batch macroscopic adsorption experiments with atomic-level Fe K-edge X-ray absorption fine structure spectroscopy (XAFS). Three cyanobacteria species (Synechococcus sp., Planktothrix sp. and Gloeocapsa sp.) and aerobic heterotrophic soil rhizobacterium (Pseudomonas aureofaciens) were used for Fe3+ and Fe2+ adsorption experiments. These experiments were carried out for a wide range of initial iron concentration (4.5-57.3 mu M) and pH (2.0-6.5). Surface adsorption data were rationalized using a Linear Programming Model (LPM), which allowed quantification of the surface adsorption constants and the number of binding sites. XAS (XANES and EXAFS) analysis of adsorbed iron demonstrated the predominance of O-coordinated Fe3+ species. Moreover, XANES data treatment using a linear combination fit of reference compounds suggested that the atomic environment of iron adsorbed onto soil bacterial surfaces was dominated by phosphoryl moieties with a lesser amount of carboxylates and some contribution of Fe(III)-oxy(hydr) oxide component. Complete oxidation of Fe(II) to Fe(III) was observed in the solid phase as determined by XANES analysis. Binding of Fe(III) to carboxylate groups was only significant for capsular cyanobacteria (Gloeocapsa sp.). The relative proportions of various Fe species at the cell surface determined by thermodynamic analysis of the macroscopic data and by XAS are in a good agreement. Our results suggest that, in the presence of surface organic ligands, the oxidation of divalent iron does occur, but the polymerization of formed Fe(III) oxy(hydr) oxides is partially inhibited and adsorbed iron in the form of both Fe-O-Fe polymers and individual Fe atoms attached to phosphoryl moieties. The presence of EPS reducesmetal-cell binding capacity and enhances Fe polymerization at the bacterial surface. (C) 2014 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0009-2541', '', '', '', 'APR 24', '2014', '372', '', '', '', '', '32', '45', '', '10.1016/j.chemgeo.2014.02.013', '', '', '', '', '', '', 'WOS:0', 0, 0),
(335, '', 'J', 'Jimenez-Villacorta, F;McDonald, I;Heiman, D;Lewis, LH;', 'Jimenez-Villacorta, F.; McDonald, I.; Heiman, D.; Lewis, L. H.', '', '', '', '', 'Tailoring exchange coupling and phase separation in Fe-Co-Mn nanocomposites', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'An intriguing pathway for the realization of metallic, rare-earth-free magnets is described. Creation of a so-called "exchange-bias" permanent magnet is contemplated that mimics the microstructure of Alnico magnets, comprised of FeCo-based precipitates that are separated by a metallic antiferromagnetic phase that replaces non-magnetic NiAl-rich phase of alnico. In this manner, the existing shape anisotropy is augmented by exchange-bias anisotropy through interphase coupling, providing enhanced coercivities. As a proof of concept, nanocomposite alloys have been fabricated from rapidly solidified Fe34Co33Mn33 ribbons that phase separate into an antiferromagnetic Mn-rich c-phase and ferromagnetic alpha-FeCo nanoprecipitates upon post-solidification processing. A progressive enhancement of coercivity, remanence, and exchange bias at T < T-N in the ferromagnetic-antiferromagnetic nanocomposite is noted upon annealing, with maximum properties realized at T-ann approximate to 673K for 30 min. Optimization of the microstructure of these Fe-Co-Mn-based alloys is anticipated to be accompanied by improved magnetic performance that could contribute to the development of next-generation permanent magnets. (C) 2014 AIP Publishing LLC.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'MAY 7', '2014', '115', '17', '', '', '', '', '', '17A729', '10.1063/1.4866704', '', '', '', '', '', '', 'WOS:0', 0, 0),
(334, '', 'J', 'Barua, R;Jimenez-Villacorta, F;Lewis, LH;', 'Barua, Radhika; Jimenez-Villacorta, Felix; Lewis, L. H.', '', '', '', '', 'Towards tailoring the magnetocaloric response in FeRh-based ternary compounds', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'In this work, we demonstrate that the magnetocaloric response of FeRh-based compounds may be tailored for potential magnetic refrigeration applications by chemical modification of the FeRh lattice. Alloys of composition Fe(Rh(1-x)A(x)) or (Fe1-xBx)Rh (A = Cu, Pd; B = Ni; 0 < x < 0.06) were synthesized via arc-melting and subsequent annealing in vacuum at 1000 degrees C for 48 h. The magnetocaloric properties of the FeRh-based systems were determined using isothermal M(H) curves measured in the vicinity of the magnetostructural temperature (T-t). It is found that the FeRh working temperature range (delta T-FWHM) may be chemically tuned over a wide temperature range, 100 K <= T <= 400 K. While elemental substitution consistently decreases the magnetic entropy change (Delta S-mag) of the FeRh-based ternary alloys from that of the parent FeRh compound (Delta S-mag,(FeRh) similar to 17 J/kg K; Delta S-mag,S-FeRh-ternary = 7-14 J/kgK at H-app = 2 T), the net refrigeration capacity (RC), defined as the amount of heat that can be transferred during one magnetic refrigeration cycle, of the modified systems is significantly higher (RCFeRh similar to 150 J/kg; RCFeRh-ternary = 170-210 J/kg at H-app = 2 T). These results are attributed to stoichiometry-induced changes in the FeRh electronic band structure and beneficial broadening of the magnetostructural transition due to local chemical disorder. (C) 2014 AIP Publishing LLC.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'MAY 7', '2014', '115', '17', '', '', '', '', '', '17A903', '10.1063/1.4854975', '', '', '', '', '', '', 'WOS:0', 0, 0),
(189, '', 'J', 'Alvarez-Alonso, Pablo;Gorria, Pedro;Sanchez Marcos, Jorge;Sanchez Llamazares, Jose L.;Blanco, Jesus A.;', '', '', '', '', '', 'The magnetocaloric effect in Er2Fe17 near the magnetic phase transition', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'Recent investigations in R2Fe17 intermetallic compounds have evidenced that these materials present a moderate magnetocaloric effect (MCE) near room temperature. A series of accurate magnetization measurements was carried out to show that the value of the demagnetizing factor has a significant influence on the absolute MCE value of Er2Fe17. In addition, the critical exponents determined from heat capacity and magnetization measurements allow us to describe the field dependence of the observed MCE around the Curie temperature.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0953-8984; 1361-648X', '', '', '', 'DEC 11 201', '2013', '25', '49', '', '', '', '', '', '496010', '10.1088/0953-8984/25/49/496010', '', '', '', '', '', '', 'WOS:0', 1, 0),
(190, '', 'J', 'Alvarez-Alonso, Pablo;Gorria, Pedro;Sanchez Llamazares, Jose L.;Cuello, Gabriel J.;Orench, Ines Puente;Sanchez Marcos, Jorge;Garbarino, Gaston;Reiffers, M.;Blanco, Jesus A.;', '', '', '', '', '', 'Exploring the magneto-volume anomalies in Dy2Fe17 with unconventional rhombohedral crystal structure', 'ACTA MATERIALIA', '', '', '', '', '', '', '', '', '', '', 'We have synthesized the Dy2Fe17 alloy with an unconventional crystal structure (R (3) over barm space group). Neutron powder thermo-diffraction and X-ray powder diffraction under high pressure (up to 15 GPa) show that the rhombohedral crystal structure is stable. Likewise, the alloy with the usual hexagonal crystal structure (P6(3)/mmc), the rhombohedral variant of Dy2Fe17 compound, exhibits a collinear ferrimagnetic order below the Curie temperature (T-C approximate to 363 K), with antiparallel mutual alignment of the Dy and Fe sublattices. Additionally, we have observed two distinctive issues related to magneto-volume anomalies: (i) the pressure dependence of the cell volume at room temperature shows the existence of a critical pressure at which the compound is no longer ferrimagnetic; and (ii) the cell volume shows invar-like behaviour in a wide temperature range (2-290 K), with a minimum at T approximate to 380 K. The spontaneous volume magnetostriction reaches omega(S) = 1.6 x 10(-2) at 2 K that decreases to zero at T approximate to 500 K (approximate to 1.4 T-C), which is associated with the existence of shortrange magnetic correlations. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1359-6454; 1873-2453', '', '', '', 'DEC 2013', '2013', '61', '20', '', '', '', '7931', '7937', '', '10.1016/j.actamat.2013.09.034', '', '', '', '', '', '', 'WOS:0', 0, 0),
(191, '', 'J', 'Vila, M.;Cicuendez, M.;Sanchez-Marcos, J.;Fal-Miyar, V.;Manzano, M.;Prieto, C.;Vallet-Regi, M.;', '', '', '', '', '', 'Electrical stimuli to increase cell proliferation on carbon nanotubes/mesoporous silica composites for drug delivery', 'JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A', '', '', '', '', '', '', '', '', '', '', 'The development of smart materials as bone implants is nowadays a challenging task to optimize their fast osteointegration. Nevertheless, no attempts have been done in joining the possibility of using electrical stimulation and drug delivery together in a material intended for bone tissue engineering. Moreover, the use of this synergy to induce bone healing is still limited until novel drug reservoirs material formulations allow an efficient applicability of the electrical stimuli. Herein, we present the biological response of osteoblasts cells, cultured over carbon nanotubesmesoporous silica composites while exposed to external electrical stimulus. Moreover, its ability to function as drug delivery systems is also demonstrated. Bone cell metabolism was stimulated and mitochondrial activity was increased up to seven times in the presence of these composites under electrical stimulus, suggesting their potential application in bone regeneration processes. (C) 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 101A:213221, 2013.', '', '', '', '', '', '', '', 2, 2, '', '', '', '1549-3296', '', '', '', 'JAN 2013', '2013', '101A', '1', '', '', '', '213', '221', '', '10.1002/jbm.a.34325', '', '', '', '', '', '', 'WOS:0', 1, 0),
(192, '', 'J', 'Alvarez-Alonso, Pablo;Gorria, Pedro;Blanco, Jesus A.;Sanchez-Marcos, Jorge;Cuello, Gabriel J.;Puente-Orench, Ines;Alberto Rodriguez-Velamazan, Jose;Garbarino, Gaston;de Pedro, Imanol;Rodriguez Fernandez, Jesus;Sanchez Llamazares, Jose L.;', '', '', '', '', '', 'Magnetovolume and magnetocaloric effects in Er2Fe17', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'Combining different experimental techniques, investigations in hexagonal P6(3)/mmc Er2Fe17 showremarkable magnetovolume anomalies below the Curie temperature, T-C. The spontaneous magnetostriction reaches 1.6 x 10(-2) at 5Kand falls to zero well above T-C, owing to short-range magnetic correlations. Moreover, Er2Fe17 exhibits direct and inverse magnetocaloric effects (MCE) with moderate isothermal magnetic entropy Delta S-M, and adiabatic temperature Delta T-ad changes [Delta S-M similar to -4.7 J(kgK)(-1) and Delta T-ad similar to 2.5 K near the T-C, and Delta S-M similar to 1.3 J(kgK)(-1) and Delta T-ad similar to -0.6 K at 40 K for Delta H = 80 kOe, respectively, determined from magnetization measurements]. The existence of an inverse MCE seems to be related to a crystalline electric field-level crossover in the Er sublattice and the ferrimagnetic arrangement between the magnetic moments of the Er and Fe sublattice. The main trends found experimentally for the temperature dependence of Delta S-M and Delta T-ad as well as for the atomic magnetic moments are qualitatively well described considering a mean-field Hamiltonian that incorporates both crystalline electric field and exchange interactions. Delta S-M (T) and Delta T-ad(T) curves are essentially zero at similar to 150 K, the temperature where the transition from direct to inverse MCE occurs. A possible interplay between the MCE and the magnetovolume anomalies is also discussed.', '', '', '', '', '', '', '', 2, 2, '', '', '', '1098-0121', '', '', '', 'NOV 9 2012', '2012', '86', '18', '', '', '', '', '', '184411', '10.1103/PhysRevB.86.184411', '', '', '', '', '', '', 'WOS:0', 0, 0),
(193, '', 'J', 'de Pedro, I.;Rojo, J. M.;Rodriguez Fernandez, J.;Sanchez Marcos, J.;Fernandez-Diaz, M. T.;Rojo, T.;', '', '', '', '', '', 'Heat capacity and neutron diffraction studies on the frustrated magnetic Co-2(OH)(PO4)(1-x)(AsO4)(x) [0 <= x <= 1] solid solution', 'JOURNAL OF SOLID STATE CHEMISTRY', '', '', '', '', '', '', '', '', '', '', 'The Co-2(OH)(PO4)(1-x)(AsO4)(x) [0 <= x <= 1] solid solution exhibits a complex magnetic behaviour due to the bond-frustration in its magnetic structure. Heat capacity measurements of the (x=0.1-0.5) phases show a three-dimensional magnetic ordering (lambda anomaly) that shifts to lower temperatures and becomes broader as the AsO43- content increases. For x=0.75, no significant feature was observed whereas for higher arsenate ion content, x=0.9 and 1, a small maximum was detected. The magnetic structures of solid solution are consistent with the existence of predominant antiferromagnetic superexchange interactions through the vertical bar OH vertical bar and vertical bar XO4 vertical bar (X=P and As) groups between the Co+2 ions. The substitution of PO43- by AsO43- anions by more than 90% substantially modifies the magnetic exchange pathways in the solid solution, leading to an incommensurate antiferromagnetic structure in Co-2(OH)(PO4)(1-x)(AsO4)(x) [x=0.9 and 1] phases. (C) 2012 Elsevier Inc. All rights reserved.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0022-4596', '', '', '', 'APR 2012', '2012', '188', '', '', '', '', '1', '10', '', '10.1016/j.jssc.2012.01.048', '', '', '', '', '', '', 'WOS:0', 0, 0),
(194, '', 'J', 'Alvarez, Pablo;Gorria, Pedro;Sanchez Marcos, Jorge;Puente Orench, Ines;Rodriguez Velamazan, Jose Alberto;Cuello, Gabriel;Sanchez Llamazares, Jose L.;Blanco, Jesus A.;', '', '', '', '', 'Gorria, P; Blanco, JA', 'Magnetic structure and magneto-volume anomalies in Er(2)Fe(17) compound', '5TH MEETING OF THE SPANISH NEUTRON SCATTERING ASSOCIATION', 'Journal of Physics Conference Series', '', '', '', '5th Biannual Meeting of the Spanish-Neutron-Scattering-Association', 'JUN 28-30,', 'Gijon, SPAIN', 'Spanish Neutron Scattering Assoc; Univ Oviedo, Dept Phys', '', '', 'Neutron powder diffraction shows that the intermetallic Er(2)Fe(17) compound with hexagonal crystal structure has a ferrimagnetic ground state (T(C) = 303 K). At T = 5 K the magnetic moments of Fe sublattice (mu similar to 2 mu(B)) are therefore antiparalell to those of the Er one (mu similar to 9 mu(B)), all of them lying on the basal plane. This compound exhibits strong magneto-volume effects up to temperatures in the vicinity of T(C). Neutron thermo-diffraction experiments also show an anomalous temperature dependence of the cell volume, including a negative thermal expansion coefficient below 300 K. In addition, a positive spontaneous volume magnetostriction is observed up to T similar to 400 K, with a maximum (omega(S) similar to 0.02) located at T = 5 K.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1742-6588', '', '', '', '2011', '2011', '325', '', '', '', '', '', '', '012011', '10.1088/1742-6596/325/1/012011', '', '', '', '', '', '', 'WOS:0', 0, 0),
(195, '', 'J', 'Rojas, D. P.;Andre, G.;Rodriguez Fernandez, J.;Sanchez Marcos, J.;Fernandez Barquin, L.;Echevarria, C.;', '', '', '', '', 'Gorria, P; Blanco, JA', 'Antiferromagnetic behaviour of Tb2Al alloy', '5TH MEETING OF THE SPANISH NEUTRON SCATTERING ASSOCIATION', 'Journal of Physics Conference Series', '', '', '', '5th Biannual Meeting of the Spanish-Neutron-Scattering-Association', 'JUN 28-30,', 'Gijon, SPAIN', 'Spanish Neutron Scattering Assoc; Univ Oviedo, Dept Phys', '', '', 'The structural, thermal and magnetic properties of the Tb2Al alloy have been investigated by AC/DC magnetic susceptibility, specific heat, X-ray and neutron diffraction measurements. DC and AC-magnetic susceptibility results are consistent with an AFM order at T-N = 52 K. The specific heat data show a lambda anomaly associated to the magnetic transition with a peak at 52 K (c(ord) = 99 J/molTbK). The analysis of thermodiffractograms of neutron diffraction patterns indicates that, below the ordering temperature, the magnetic reflections can be indexed with a commensurate lattice related to the crystallographic cell (Pmna) by a propagation vector k = (1/2, 1/2, 1/2). The results are compared with those reported for other magnetic rare earth alloys of R2Al-type (with R = Nd, Gd and Dy).', '', '', '', '', '', '', '', 0, 0, '', '', '', '1742-6588', '', '', '', '2011', '2011', '325', '', '', '', '', '', '', '012023', '10.1088/1742-6596/325/1/012023', '', '', '', '', '', '', 'WOS:0', 1, 0),
(196, '', 'J', 'Alvarez, Pablo;Gorria, Pedro;Sanchez Marcos, Jorge;Fernandez Barquin, Luis;Blanco, Jesus A.;', '', '', '', '', '', 'The role of boron on the magneto-caloric effect of FeZrB metallic glasses', 'INTERMETALLICS', '', '', '', '', '', '', '', '', '', '', 'Fe-rich FeZrB metallic glasses exhibit magneto-caloric effect (MCE) around room temperature. Amorphous ribbons of two different compositions, Fe(91)Zr(7)B(2) and Fe(88)Zr(8)B(4), with respective Curie temperature values of 230 and 285 K have been studied. Although the maximum magnetic entropy change is relatively moderate (vertical bar Delta S(M)vertical bar(max) similar to 3 J K(-1) Kg(-1) under an applied magnetic field change from 0 to 50 kOe), the MCE spreads over a broad temperature interval (Delta T similar to 200 K), giving rise to a large refrigerant capacity loss (RC similar to 435 J kg(-1)) without any hysteresis. The Curie temperature can be easily tuned between 200 and 350 K by changing the boron content. Therefore, the MCE can be controlled over a wide temperature interval, thus making these amorphous alloys promising candidates for magnetic refrigeration near room temperature. (C) 2010 Elsevier Ltd. All rights reserved.', '', '', '', '', '', '', '', 7, 7, '', '', '', '0966-9795', '', '', '', 'DEC 2010', '2010', '18', '12', '', '', '', '2464', '2467', '', '10.1016/j.intermet.2010.07.018', '', '', '', '', '', '', 'WOS:0', 0, 0),
(197, '', 'J', 'Alvarez, P.;Sanchez-Marcos, J.;Sanchez Llamazares, J.L.;Franco, V.;Reiffers, M.;Blanco, J.A.;Gorria, P.;', '', '', '', '', '', 'Magnetocaloric Effect in Nanostructured Pr 2Fe 17 and Nd 2Fe 17 Synthesized by High-Energy Ball-Milling ', 'Acta Physica Polonica A', '', '', '', '', '', '', '', '', '', '', 'Nanocrystalline Pr 2Fe 17 and Nd 2Fe 17 powders with rhombohedral Th 2Zn 17-type crystal structure and average particle sizes around 20 nm have been obtained by high-energy ball milling. While the bulk alloys show a well-defined and sharp drop in the low-field magnetization curve at the Curie temperature, T C = 285 K (Pr) and 335 K (Nd), the ball-milled samples exhibit a substantial broadening of the ferro-to-paramagnetic transition due to a considerable augmentation of the disordered inter-grain boundaries. The latter results in an increase of more than 25% in the values of the full width at half maximum of the temperature dependence of the magnetic entropy change maintaining almost unchanged the relative cooling power.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0587-4246', '', '', '', 'Nov. 2010', '2010', '18', '5', '', '', '', '867', '9', '', '', '', '', '', '', '', '', 'INSPE', 0, 0),
(321, '', 'J', 'Martinez-Morillas, Rocio;Ramirez, Rafael;Sanchez-Marcos, Jorge;Fonda, Emiliano;de Andres, Alicia;Prieto, Carlos;', '', '', '', '', '', 'Huge Photoresistance in Transparent and Conductive Indium Titanium Oxide Films Prepared by Electron Beam-Physical Vapor Deposition', 'ACS APPLIED MATERIALS & INTERFACES', '', '', '', '', '', '', '', '', '', '', 'Transparent and conductive indium titanium oxide (ITiO) films have been obtained by electron beam physical vapour deposition with Ti content from 5 at % up to 28 at %. X-ray absorption spectroscopy techniques have been used to identify the local environment of Ti ions. Even at the lowest concentrations Ti is not incorporated into the In2O3 structure but forms clusters of a Ti-In mixed oxide that present a distorted ruffle TiO2 short-range order. The optical transmittance of the annealed samples reaches 95 % and no significant variation of the gap energy (around 3.7 eV) is observed with Ti content. The electronic conductivity under light irradiation is studied evidencing a huge photo-resistance in the samples with Ti content above 22 at % reaching more than two orders of magnitude for the 26 at % Ti under illumination with few mu W/cm(2) at 365 nm. Hall and conductivity results are analyzed using a model that takes into account both electron and hole carriers as well as the conductivity enhancement by carrier photogeneration. The electron carrier density decreases with Ti content while its mobility increases up to values of 1000 cm(2)/(V s). Oxygen annealed ITiO films obtained by this technique with Ti content below 10 at % have properties adequate as transparent semiconductors and those with Ti content higher than 22 at % have exceptional photoresistive properties relevant for numerous applications.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1944-8244', '', '', '', 'FEB 12 201', '2014', '6', '3', '', '', '', '1781', '1787', '', '10.1021/am404675n', '', '', '', '', '', '', 'WOS:0', 1, 0),
(199, '', 'J', 'Lopez-Garcia, Martin;Galisteo-Lopez, Juan F.;Blanco, Alvaro;Sanchez-Marcos, Jorge;Lopez, Cefe;Garcia-Martin, Antonio;', '', '', '', '', '', 'Enhancement and Directionality of Spontaneous Emission in Hybrid Self-Assembled Photonic-Plasmonic Crystals', 'SMALL', '', '', '', '', '', '', '', '', '', '', NULL, '', '', '', '', '', '', '', 23, 23, '', '', '', '1613-6810', '', '', '', 'AUG 16 201', '2010', '6', '16', '', '', '', '1757', '1761', '', '10.1002/smll.201000216', '', '', '', '', '', '', 'WOS:0', 1, 0),
(200, '', 'J', 'Alvarez, Pablo;Sanchez Marcos, Jorge;Gorria, Pedro;Fernandez Barquin, Luis;Blanco, Jesus A.;', '', '', '', '', '', 'Magneto-caloric effect in FeZrB amorphous alloys near room temperature', 'JOURNAL OF ALLOYS AND COMPOUNDS', '', '', '', '', '16th International Symposium on Metastable, Amorphous and Nanostructured Materials', 'JUL 05-09,', 'Beijing, PEOPLES R CHINA', '', '', '', 'The magneto-caloric effect exhibited by three Fe-rich FeZrB amorphous alloys with different compositions and Curie temperatures between 230 and 300K has been studied. Albeit the maximum entropy change is low (|Delta S-M| max similar to 3Jkg(-1) K-1 under an applied magnetic field change from 0 to 50 kOe), the magneto-caloric effect (MCE) spreads out over a broad temperature interval (Delta T similar to 200 K). The estimated values for the relative cooling power are close to that of pure Gd. From the applied magnetic field dependence of the magnetic entropy change a master curve valid for these Fe-rich FeZrB amorphous alloys has been found. However, two reference temperatures of the |Delta S-M|(T) are needed in order to get a collapsing curve for all the maximum applied magnetic field values. The latter suggests that the striking magnetic behaviour of these compounds below 200K influences the MCE effect. Moreover, the collapse into the same curve for different rescaled temperature dependences of the magnetic entropy change in the three samples implies the existence of similar magnetic interactions in these compounds. (C) 2010 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 9, 9, '', '', '', '0925-8388', '', '', '', 'AUG 2010', '2010', '504', '', '', '', '1', 'S150', 'S154', '', '10.1016/j.jallcom.2010.02.149', '', '', '', '', '', '', 'WOS:0', 0, 0),
(201, '', 'J', 'Sanchez-Marcos, J.;Ochando, I. M.;Galindo, R. Escobar;Martinez-Morillas, R.;Prieto, C.;', '', '', '', '', '', 'Optical and transport properties of Ti-doped In2O3 thin films prepared by electron beam physical vapour deposition', 'PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE', '', '', '', '', 'Symposium on Advances in Transparent Electronics held at the 2009 EMRS Spring Meeting', 'JUN 08-12,', 'Strasbourg, FRANCE', 'European Mat Res Soc', '', '', 'Ti-doped In2O3 (ITiO) thin films have been prepared by electron beam physical vapour deposition (EB-PVD). Their optical and electrical properties are studied for the obtained compositions. After oxygen annealing all samples show excellent optical transparence; additionally, maximum values for conductivity are obtained for samples with titanium contents near 6 at.%, with typical resistivity values of 4 x 10(-5) Omega cm. Finally, the band-gap energy evolution is studied for the set of samples. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim', '', '', '', '', '', '', '', 1, 1, '', '', '', '1862-6300', '', '', '', 'JUL 2010', '2010', '207', '7', '', '', '', '1549', '1553', '', '10.1002/pssa.200983717', '', '', '', '', '', '', 'WOS:0', 1, 0),
(202, '', 'J', 'Alvarez, Pablo;Gorria, Pedro;Franco, Victorino;Sanchez Marcos, Jorge;Perez, Maria J.;Sanchez Llamazares, Jose L.;Puente Orench, Ines;Blanco, Jesus A.;', '', '', '', '', '', 'Nanocrystalline Nd2Fe17 synthesized by high-energy ball milling: crystal structure, microstructure and magnetic properties', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'Nanocrystalline Nd2Fe17 powders have been obtained by means of high-energy ball milling from nearly single-phase bulk alloys produced by arc melting and high temperature homogenization annealing. The rhombohedral Th2Zn17-type crystal structure of the bulk alloy remains unaltered after the milling process, with almost unchanged values for the cell parameters. However, the severe mechanical processing induces drastic microstructural changes. A decrease of the mean crystalline size down to around 10 nm is observed, giving rise to a considerable augmentation of the disordered inter-grain boundaries. This modification of the microstructure affects the magnetic behaviour of the milled powders, although the magnetic structure remains collinear ferromagnetic. While a unique ferro-to-paramagnetic transition temperature, T-C = 339 +/- 2 K, is observed in the bulk alloy, the nanocrystalline samples exhibit a more likely distribution of T-C values. The latter seems to be responsible for the significant broadening of the temperature range in which magneto-caloric effect is observed, and the lowering of the maximum value of the magnetic entropy change.', '', '', '', '', '', '', '', 13, 13, '', '', '', '0953-8984', '', '', '', 'JUN 2 2010', '2010', '22', '21', '', '', '', '', '', '216005', '10.1088/0953-8984/22/21/216005', '', '', '', '', '', '', 'WOS:0', 0, 0),
(203, '', 'J', 'Cespedes, Eva;Babonneau, David;Lyon, Olivier;Sanchez-Marcos, Jorge;Rouziere, Stephan;Prieto, Carlos;Olivi, Luca;Traverse, Agnes;', '', '', '', '', '', 'Characterization of two dimensional self-organized Au nanoparticles embedded in Si3N4', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Au/Si3N4 films have been prepared by gold and silicon nitride sequential sputtering with different Au thicknesses. The goal is to investigate the Au growth mode and to identify the regime where Au nanoparticles (NPs) can be prepared. The number of Au atoms, the bilayer thickness, the Au environment, the size, and the organization of the particles have been determined. Gold appears in metallic form. The thickest Au layer (8 nm) is continuous whereas the thinnest ones (with average values of 1-3 nm) are formed by nearly spherical Au NPs with diameters in the 5-7 nm range. Au NPs spatial self-organization is observed for average thickness of t(Au) = 2.9 nm. These growth modes are discussed and compared with those observed for other metal/Si3N4 systems prepared in similar conditions. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3359705]', '', '', '', '', '', '', '', 4, 4, '', '', '', '0021-8979', '', '', '', 'MAY 15 201', '2010', '107', '10', '', '', '', '', '', '104306', '10.1063/1.3359705', '', '', '', '', '', '', 'WOS:0', 1, 0),
(204, '', 'J', 'Cespedes, E.;Sanchez-Marcos, J.;Garcia-Lopez, J.;Prieto, Carlos;', '', '', '', '', '', 'Evolution of ferromagnetism with sputtering gas in Mn:ZnO films', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', '', '', '4th Joint European Magnetic Symposia (JEMS 08)', 'SEP 14-19,', 'Dublin, IRELAND', 'Sci Fdn Ireland', '', '', 'The effect of introducing nitrogen and oxygen in the sputtering working gas on the magnetic properties of Mn:ZnO thin films has been investigated. A set of films has been characterized by X-ray diffraction, X-ray absorption near edge structure (XANES) and optical absorption spectroscopy to correlate its magnetic properties with Mn electronic characteristics. Mn2+ substituting Zn2(+) in the wurtzite structure has been obtained for the films presenting considerably high saturation magnetization values. The change in the magnetic behaviour seems to be associated with the electronic carrier density in the films. (C) 2009 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 3, 3, '', '', '', '0304-8853; 1873-4766', '', '', '', 'MAY-JUN 20', '2010', '322', '9-12', '', '', '', '1201', '1204', '', '10.1016/j.jmmm.2009.05.038', '', '', '', '', '', '', 'WOS:0', 1, 0),
(205, '', 'J', 'Gorria, Pedro;Alvarez, Pablo;Sanchez Marcos, Jorge;Sanchez Llamazares, Jose L.;Blanco, Jesus A.;', '', '', '', 'IOP', '', 'Nanocrystalline Pr2Fe17 studied by neutron powder diffraction', 'INTERNATIONAL CONFERENCE ON NEUTRON SCATTERING 2009', 'Journal of Physics Conference Series', '', '', '', 'International Conference on Neutron Scattering 2009', 'MAY 03-07,', 'Knoxville, TN', '', '', '', 'We have used neutron powder diffraction to make a comprehensive study of the crystal structure in Pr2Fe17 nanocrystalline compounds. These nanostructured materials have been obtained by high-energy ball milling from an arc-melted bulk polycrystalline alloy. The Th2Zn17-type rhombohedral crystal structure of the starting bulk alloy is maintained after milling for 10 and 20 hours. The studied alloys are ferromagnetic below T-C = 286+/-1 K (bulk) and T-C approximate to 300+/-20 K (milled). These materials exhibit strong magneto-volume anomalies below T-C, such as a negative coefficient of thermal expansion (alpha(V) approximate to -30 x 10(-6) K-1).', '', '', '', '', '', '', '', 0, 0, '', '', '', '1742-6588', '', '', '', '2010', '2010', '251', '', '', '', '', '', '', '012012', '10.1088/1742-6596/251/1/012012', '', '', '', '', '', '', 'WOS:0', 0, 0),
(206, '', 'J', 'Carbonera, C.;Luis, F.;Campo, J.;Sanchez-Marcos, J.;Camon, A.;Chaboy, J.;Ruiz-Molina, D.;Imaz, I.;van Slageren, J.;Dengler, S.;Gonzalez, M.;', '', '', '', '', '', 'Effect of crystalline disorder on quantum tunneling in the single-molecule magnet Mn-12 benzoate', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'We report a detailed study of the effects that crystalline disorder has on the magnetic relaxation and quantum tunneling of Mn-12 benzoate clusters. Thanks to the absence of interstitial molecules in the crystal structure of this molecular compound, we have been able to isolate the influence of long-range crystalline disorder. For this, we compare results obtained under two extreme situations: a crystalline sample and a nearly amorphous material. The results show that crystalline disorder affects little the anisotropy, magnetic relaxation, and quantum tunneling of these materials. It follows that disorder is not a necessary ingredient for the existence of magnetic quantum tunneling. The results unveil, however, a subtle influence of crystallinity via the modification of the symmetry of dipole-dipole interactions. The faster tunneling rates measured for the amorphous material are accounted for by a narrower distribution of dipolar bias in this material, as compared with the crystalline sample.', '', '', '', '', '', '', '', 10, 11, '', '', '', '1098-0121', '', '', '', 'JAN 1 2010', '2010', '81', '1', '', '', '', '', '', '014427', '10.1103/PhysRevB.81.014427', '', '', '', '', '', '', 'WOS:0', 0, 0),
(207, '', 'J', 'Rojas, D. P.;Espeso, J. I.;Rodriguez Fernandez, J.;Gomez Sal, J. C.;Marcos, J. Sanchez;Mueller, H.;', '', '', '', '', '', 'First order ferromagnetic transition in binary CeIn2', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'Measurements of the magnetic, thermal, and transport properties of the CeIn2 binary alloy are consistent with a paramagnetic-ferromagnetic transition at T-C=22 K. A discontinuity in the magnetic entropy, electrical resistivity and thermal expansion, and a huge anomaly in the specific heat of 113 J/mol K (Delta c(mag)=103 J/mol K), at the magnetic transition, are observed. In addition, the Arrott plots show negative slope at low fields, the field-cooling and field-warming magnetization present irreversibility, and both the susceptibility and the resistivity evidence a small thermal hysteresis of 0.05 K. Moreover, the values of the entropy change calculated from the magnetization data using the Clausius-Clapeyron equation are in good agreement with those directly obtained from the specific-heat data. The joint analysis of all these results provides evidence for the first order character of this magnetic transition in CeIn2.', '', '', '', '', '', '', '', 11, 11, '', '', '', '1098-0121', '', '', '', 'NOV 2009', '2009', '80', '18', '', '', '', '', '', '184413', '10.1103/PhysRevB.80.184413', '', '', '', '', '', '', 'WOS:0', 0, 0),
(208, '', 'J', 'Sanchez Llamazares, J. L.;Perez, M. J.;Alvarez, P.;Santos, J. D.;Sanchez, M. L.;Hernando, B.;Blanco, J. A.;Sanchez Marcos, J.;Gorria, P.;', '', '', '', '', '', 'The effect of ball milling in the microstructure and magnetic properties of Pr2Fe17 compound', 'JOURNAL OF ALLOYS AND COMPOUNDS', '', '', '', '', '14th International Symposium on Metastable and Nano-Materials', 'AUG 26-30,', 'Corfu, GREECE', '', '', '', 'The effect of a severe mechanical milling treatment on the microstructure, magnetic and magneto-caloric properties of Pr2Fe17 powders is reported. Bulk alloys showing a rhombohedral Th2Zn17-type crystal structure were mechanically ball milled under Ar atmosphere. After 10 h of milling this crystal structure persists and the mean values of the lattice parameters remain almost unchanged. Average grain sizes around 27 nm were estimated by both, transmission electron microscopy and neutron powder diffraction measurements. While for the starting bulk alloys the low field temperature of the magnetization, M(T), shows a well-defined and sharp decrease at the Curie temperature, T-c = 285(2) K, in ball milled samples the transition becomes broad not allowing an accurate determination of Curie point; in addition, this intrinsic parameter seems to be shifted toward a higher temperature [292(10)K]. The magnetocaloric effect at mu H-o(max) = 5 T was evaluated from the temperature dependence of magnetic entropy change, through the variation of M(H,T) curves. A decrease in the peak value of magnetic entropy change, vertical bar Delta S-M(max)vertical bar, from 5.7 to 3.7 J kg(-1) K-1, and the broadening of the maximum is observed for the milled sample respect to the bulk alloy. (C) 2008 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 3, 3, '', '', '', '0925-8388', '', '', '', 'AUG 26 200', '2009', '483', '1-2', '', '', '', '682', '685', '', '10.1016/j.jallcom.2008.07.210', '', '', '', '', '', '', 'WOS:0', 0, 0),
(209, '', 'J', 'Gorria, Pedro;Alvarez, Pablo;Sanchez Marcos, Jorge;Sanchez Llamazares, Jose L.;Perez, Maria J.;Blanco, Jesus A.;', '', '', '', '', '', 'Crystal structure, magnetocaloric effect and magnetovolume anomalies in nanostructured Pr2Fe17', 'ACTA MATERIALIA', '', '', '', '', '', '', '', '', '', '', 'Using high-energy ball milling, nanostructured Pr2Fe17 powders can be obtained from their arc-melted bulk alloys. High-resolution X-ray and neutron powder diffraction experiments reveal that the Th2Zn17-type rhombohedral crystal structure is maintained, after milling for 10 h, with almost unchanged values for both crystalline lattice parameters (Delta a; Delta c < 0.05%) and vanishing mechanically induced microstrain (< 0.1%). Although the mean crystalline size decreases down on 20 +/- 3 nm, magnetovolume anomalies observed in pure Pr2Fe17 are still present with a significant volume decrease on heating front 5 up to 320 K. After the milling, a significant increase in the magnetic anisotropy, due to the drastic reduction in crystalline size, is observed, while the value of the magnetic moment seems to be increased slightly (5%). In addition, the magnetocaloric effect of bulk and nanostructured Pr2Fe17 has been investigated. The magnetic entropy change, |Delta S-M|, decreases from 6.3 to 4.5 J kg(-1) K-1 under an applied magnetic field mu H-0 = 5 T after the milling process. However, the width of the |Delta S-M|(T) curve is substantially enlarged and hence the refrigerant capacity is enhanced. These findings make the iron-based nanostructured Pr2Fe17 powders interesting for applications in magnetic refrigeration at around room temperature. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.', '', '', '', '', '', '', '', 20, 20, '', '', '', '1359-6454', '', '', '', 'APR 2009', '2009', '57', '6', '', '', '', '1724', '1733', '', '10.1016/j.actamat.2008.12.014', '', '', '', '', '', '', 'WOS:0', 0, 0),
(210, '', 'J', 'Alvarez, P.;Sanchez Llamazares, J. L.;Perez, M. J.;Hernando, B.;Santos, J. D.;Sanchez-Marcos, J.;Blanco, J. A.;Gorria, P.;', '', '', '', '', '', 'Microstructural and magnetic characterization of Nd2Fe17 ball milled alloys', 'JOURNAL OF NON-CRYSTALLINE SOLIDS', '', '', '', '', '9th International Workshop on Non Crystalline Solids', 'APR 27-30,', 'Univ Porto, Dept Phys, Porto, PORTUGAL', 'Fund Cienc & Tecnol; Univ Porto, Fac Sci; Inst Nanotechnol; Univ Porto, Inst Phys Mat', '', '', 'Microstructural and magnetic changes induced by ball milling in Nd2Fe17 alloy have been investigated. X-ray and neutron powder diffraction studies have shown that the main crystalline phase present in the as-cast Nd2Fe17 compound is the rhombohedral Th2Zn17-type crystal structure. Contrary to other materials, the crystal structure does not change after milling, and the crystal lattice parameters slightly increases while the induced strain is less than 0.1%. It has been observed from SEM and TEM images that the microstructure consists of agglomerates of nanoparticles with a mean size around 20 nm, and from magnetic measurements a broadening of the temperature range in which ferromagnetic to paramagnetic transition takes place. (C) 2008 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 5, 5, '', '', '', '0022-3093', '', '', '', 'DEC 1 2008', '2008', '354', '47-51', '', '', '', '5172', '5174', '', '10.1016/j.jnoncrysol.2008.08.020', '', '', '', '', '', '', 'WOS:0', 0, 0),
(211, '', 'J', 'Levit, Rafael;Barrio, Maria;Veglio, Nestor;Tamarit, Josep Ll.;Negrier, Philippe;Pardo, Luis C.;Sanchez-Marcos, Jorge;Mondieig, Denise;', '', '', '', '', '', 'From the Two-Component System CBrCl3 + CBr4 to the High-Pressure Properties of CBr4', 'JOURNAL OF PHYSICAL CHEMISTRY B', '', '', '', '', '', '', '', '', '', '', 'The experimental phase diagram of the CBrCl3 + CBr4 system has been determined by means of X-ray powder diffraction and thermal analysis techniques from 200 K to the liquid state. Before melting, the two components have the same orientationally disordered (OD) face-centered cubic phase, and solid-liquid equilibrium is explained by simple isomorphism. The application of multiple crossed isopolymorphism formalism to the low-temperature solid-solid equilibria has enabled the inference of an OD rhombohedral metastable (at normal pressure) phase for CBr4. Experimental determination of the pressure-volume-temperature and construction of the pressure-temperature phase diagrams for CBr4 reveal the existence of a high-pressure phase, the rhombohedral symmetry of which is inferred by means of the thermodynamic assessment of the experimental phase diagram and demonstrated by means of high-pressure neutron diffraction measurements. The procedure used in this work confirms the connection between the appearance of metastable phases at normal pressure and their existence at high-pressure.', '', '', '', '', '', '', '', 5, 5, '', '', '', '1520-6106', '', '', '', 'NOV 6 2008', '2008', '112', '44', '', '', '', '13916', '13922', '', '10.1021/jp806180y', '', '', '', '', '', '', 'WOS:0', 0, 0),
(212, '', 'J', 'Gorria, Pedro;Llamazares, Jose L. Sanchez;Alvarez, Pablo;Perez, Maria Jose;Marcos, Jorge Sanchez;Blanco, Jesus A.;', '', '', '', '', '', 'Relative cooling power enhancement in magneto-caloric nanostructured Pr(2)Fe(17)', 'JOURNAL OF PHYSICS D-APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The magneto-caloric effect (MCE) of arc-melted bulk and 10 h ball-milled nanostructured Pr(2)Fe(17) powders has been investigated. The maximum value for the magnetic entropy change, vertical bar Delta S(M)vertical bar, in the milled alloy is 4.5 J kg(-1) K(-1) for mu(0)H = 5T, at around room temperature. The full width at half maximum, delta T(FWHM), of vertical bar Delta S(M)vertical bar(T) for the nanostructured powders is about 60% greater than that of the starting bulk alloy, thus giving rise to large relative cooling power values of 573 J kg(-1) (4.5 J cm(-3)) for mu(0)H = 5T estimated from the product of vertical bar Delta S(M)vertical bar(max) x delta T(FWHM). These results have been compared with those of well-known magnetic materials that exhibit a large or giant MCE effect. The potential for using these low-cost iron based nanostructured Pr(2)Fe(17) powders in magnetic refrigeration at room temperature is also discussed.', '', '', '', '', '', '', '', 40, 40, '', '', '', '0022-3727', '', '', '', 'OCT 7 2008', '2008', '41', '19', '', '', '', '', '', '192003', '10.1088/0022-3727/41/19/192003', '', '', '', '', '', '', 'WOS:0', 0, 0),
(213, '', 'J', 'Marcos, J. Sanchez;Fernandez, J. Rodriguez;Chevalier, B.;', '', '', '', '', '', 'Hydrogen induced antiferromagnetism in CeNiSn studied by heat capacity and magnetocaloric effect', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', '', '', '17th International Conference on Magnetism (ICM 2006)', 'AUG 20-25,', 'Kyoto, JAPAN', 'Int Union Pure & Appl Phys', '', '', 'Hydrogenation of CeNiSn provokes a change of the ground state of cerium from Kondo insulator to antiferromagnetic (CeNiSnH1.0) or ferromagnetic (CeNiSnH1.8) behaviour. We report heat capacity measurements in CeNiSnH1.0 performed in magnetic fields up to 90 kOe. The calculated magnetocaloric effect has a maximum at temperatures close to T-N = 4.5K. The values of the isothermal magnetic entropy (Delta S-m) and the adiabatic temperature change (Delta T-ad) are modest, and similar to those found in other Ce compounds. The field dependence of both, heat capacity and magnetocaloric effect clearly indicate the nature of the magnetic transition. (c) 2006 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 7, 7, '', '', '', '0304-8853', '', '', '', 'MAR 2007', '2007', '310', '2', '', '1', '', '383', '385', '', '10.1016/j.jmmm.2006.10.486', '', '', '', '', '', '', 'WOS:0', 0, 0),
(214, '', 'J', 'de Pedro, Imanol;Maria Rojo, Jose;Luis Pizarro, Jose;Rodriguez Fernandez, Jesus;Sanchez Marcos, Jorge;Teresa Fernandez-Diaz, Maria;Arriortua, Maribel;Rojo, Teofilo;', '', '', '', '', '', 'Magnetic evolution of the antiferromagnetic Co2-xCux(OH)PO4 (0 <= x <= 2) solid solution. A neutron diffraction study', 'JOURNAL OF MATERIALS CHEMISTRY', '', '', '', '', '', '', '', '', '', '', 'The Co2-xCux(OH) PO4 (0 <= x <= 2) solid solution was prepared from hydrothermal synthesis. Neutron powder diffraction patterns show that the Co2+ and C2+ ions are simultaneously present in both the [MO4(OH)(2)] octahedra and the [ MO4( OH)] distorted trigonal bipyramid topologies. The evolution of the lattice parameters follows Vegard''s law in the whole range of substitution. This study allowed us to determine correctly the a and b crystallographic parameters of the Cu-2(OH) PO4 phase which were interchanged in the literature. The magnetic behaviour in the cobalt - copper compounds indicates the existence of overall antiferromagnetic interactions as predominant. Three- dimensional magnetic ordering with critical temperatures of 69, 64, 60 and 47 K for x = 0.1, 0.3, 0.5 and 1 respectively is observed. The magnetic study of Co1.9Cu0.1(OH) PO4 suggests a spin- glass like state below 10 K. AC measurements obtained at different frequencies and applied fields confirm the freezing process in Co1.9Cu0.1 and the long range interactions in the Co2-xCux( OH) PO4 (x <= 1) phases. For x <= 1, the magnetic dimensionality decreases with the increase of Cu( II) amount being of short range for x = 2. These results are attributed to the presence of the unpaired electron in the d(x)(2)-(2)(y) orbital and the absence of overlap between neighbour ions. Specific- heat measurements confirm the evolution to a short range magnetic system with the Cu( II) amount. From low- temperature neutron diffraction data, it can be observed that the existence of antiferromagnetic order for x <= 1 is originated by the antiparallel ordering of both ferromagnetic linear octahedral chains and trigonal bipyramidal dimers. The propagation vector is k = [ 0,0,0] and the magnetic moments are aligned in the z direction. The values of the main magnetic exchange pathways [ M - O - M] are characteristic of ferro- and antiferromagnetic couplings with a superexchange ferromagnetic angle, M( 1) - O( 3) - M( 2) of 107 - 109 degrees, which plays an important role in the competition of the freezing process. These results are explained on the basis of both the electronic configuration and the correlations between structural and magnetic properties.', '', '', '', '', '', '', '', 13, 13, '', '', '', '0959-9428', '', '', '', '2007', '2007', '17', '37', '', '', '', '3915', '3926', '', '10.1039/b705549h', '', '', '', '', '', '', 'WOS:0', 0, 0),
(215, '', 'J', 'Chung, U. -Chan;Mesa, Jose L.;Pizarro, Jose L.;Rodriguez Fernandez, Jesus;Sanchez Marcos, Jorge;Garitaonandia, Jose S.;Arriortua, Maria I.;Rojo, Teofilo;', '', '', '', '', '', 'Structural, thermal, spectroscopic, specific-heat, and magnetic studies of (C5H18N3)[Fe-3(HPO3)(6)]center dot 3H(2)O: A new organically templated iron', 'INORGANIC CHEMISTRY', '', '', '', '', '', '', '', '', '', '', 'A new open framework iron(III) phosphite with formula (C5H18N3)[Fe-3(HPO3)(6)]center dot 3H(2)O has been prepared by hydrothermal synthesis with N-(2-aminoethyl)-1,3-propanediamine as a templating agent. The crystal structure was solved from single-crystal X-ray diffraction data in the trigonal space group R (3) over cap. The unit cell parameters are a= 8.803(1) angstrom and c= 25.292(2) angstrom with Z= 3. The complex pillared structure can be described as two interpenetrating subnets, one organic, [(C5H18N3)center dot 3H2O](3+), and one inorganic, [Fe-3(HPO3)(6)](3-). In the inorganic subnet, the pillars are formed by FeO6 trimers linked by vertex sharing phosphite groups, while in the cationic subnet the organic molecules act like pillars. With increasing temperature, the flexibility of the structure allows contraction due to dehydration followed by thermal expansion before reaching the thermal stability limit. The Dq and Racah parameters calculated for (C5H18N3)[Fe-3(HPO3)(6)]center dot 3H(2)O are Dq = 965, B = 1080, and C = 2472 cm(-1). Mossbauer spectroscopy confirms the trivalent oxidation state of iron cations and the crystallographic multiplicities of their sites. The ESR spectra show isotropic signals with a g-value of 2.00(1). Specific-heat measurements show a three-dimensional (lambda-type) peak at a critical temperature T-c = 32 K. The value of the entropy at saturation is 46 J/mol K, very near the expected value of 44.7 J/mol K for the iron(III) cations with S = 5/2. Magnetic measurements indicate a three-dimensional antiferromagnetic ordering below 32 K and a reorientation of spins below 15 K with an incomplete cancellation of spins due to triangular interactions inherent to the structure.', '', '', '', '', '', '', '', 18, 18, '', '', '', '0020-1669', '', '', '', 'OCT 30 200', '2006', '45', '22', '', '', '', '8965', '8972', '', '10.1021/ic060815u', '', '', '', '', '', '', 'WOS:0', 0, 0),
(216, '', 'J', 'Chevalier, B.;Matar, S. F.;Menetrier, M.;Marcos, J. Sanchez;Fernandez, J. Rodriguez;', '', '', '', '', '', 'Influence of Ce-H bonding on the physical properties of the hydrides CeCoSiH1.0 and CeCoGeH1.0', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'The hydrides CeCoSiH1.0 and CeCoGeH1.0 which crystallize like the parent antiferromagnetic compounds CeCoSi and CeCoGe in the tetragonal CeFeSi-type structure, have been investigated by specific heat and thermoelectric power measurements and H-1 nuclear magnetic resonance (NMR). CeCoSiH1.0 is an intermediate valence compound whereas CeCoGeH1.0 can be considered as a nearly trivalent cerium compound. This behaviour is corroborated by the occurrence of a slight broadening of the H-1 NMR signal in the sequence CeCoSiH1.0. CeCoGeH1.0. The band structure calculations performed on these hydrides reveal the existence of strong bonding Ce-H interaction, found to be larger in CeCoSiH1.0 than in CeCoGeH1.0.', '', '', '', '', '', '', '', 20, 20, '', '', '', '0953-8984; 1361-648X', '', '', '', 'JUL 5 2006', '2006', '18', '26', '', '', '', '6045', '6056', '', '10.1088/0953-8984/18/26/022', '', '', '', '', '', '', 'WOS:0', 0, 0),
(217, '', 'J', 'Fernandez, J.R.;Marcos, J.S.;Chevalier, B.;Bobet, J.-L.;', '', '', '', '', '', 'Magnetocaloric effect induced by hydrogen absorption in CeNiIn', 'Physica B', '', '', '', '', '', '', '', '', '', '', 'In the intermediate valence (IV) CeNiIn, the Ce ions evolve towards a trivalent state with a ferromagnetic transition at low temperature when hydrogen is interstitially inserted. In this work, we present heat capacity measurements on CeNiInH 1.8 carried out under magnetic fields up to H=90 kOe. The observed lambda-anomaly and its evolution with magnetic field confirm the existence of the ferromagnetic transition. The total entropy shifts to higher temperatures with increasing field, giving rise to the appearance of magnetocaloric effect. We have found that both the isothermal magnetic entropy (DeltaS m) and the adiabatic temperature change (DeltaT ad) display significant peaks around 6.5K, despite the small magnetic moment of the Ce ions. [All rights reserved Elsevier].', '', '', '', '', '', '', '', 0, 0, '', '', '', '0921-4526', '', '', '', '1 May 2006', '2006', '378-3', '', '', '', '', '799', '800', '', '10.1016/j.physb.2006.01.334', '', '', '', '', '', '', 'INSPE', 0, 0),
(218, '', 'J', 'Chevalier, B;Matar, SF;Marcos, JS;Fernandez, JR;', '', '', '', '', '', 'From antiferromagnetic ordering to spin fluctuation behavior induced by hydrogenation of ternary compounds CeCoSi and CeCoGe', 'PHYSICA B-CONDENSED MATTER', '', '', '', '', 'International Conference on Strongly Correlated Electron Systems (SECES 05)', 'JUL 26-30,', 'Vienna, AUSTRIA', '', '', '', 'The ternary compounds CeCoSi and CeCoGe exhibit an antiferromagnetic ordering at 8.8 and 5.0 K, respectively. We present magnetization and specific heat measurements on these compounds and their hydrides, CeCoSiH and CeCoGeH. The hydrogen absorption reveals an original transition from antiferromagnetic to spin fluctuation behavior. CeCoSiH and CeCoGeH present a spin fluctuation temperature T-sf around 130 and 15 K, respectively. (c) 2006 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 16, 16, '', '', '', '0921-4526', '', '', '', 'MAY 1 2006', '2006', '378-8', '', '', '', '', '795', '796', '', '10.1016/j.physb.2006.01.291', '', '', '', '', '', '', 'WOS:0', 0, 0),
(219, '', 'J', 'de Pedro, I.;Rojo, J. M.;Pizarro, J. L.;Fernandez, J. Rodriguez;Marcos, J. Sanchez;Fernandez-Diaz, M. T.;Arriortua, M. I.;Rojo, T.;', '', '', '', '', '', 'Magnetic structures of (Co2-xNix) (OH)PO4 (x=0.1, 0.3) spin glass-like state in antiferromagnetically ordered phases', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'Compounds of the general formula CO2-xNix(OH)PO4 (x = 0.1, 0.3) have been synthesized under mild hydrothermal conditions. Neutron powder diffraction, susceptibility and heat capacity measurements were carried out on polycrystalline samples. The cobalt-nickel compounds are ordered as three-dimensional antiferromagnets with ordering temperatures of 70 and 64 K for x = 0.1 and x = 0.3, respectively. The magnetic study shows a spin glass-like state below 11 and 5 K for Co1.9Ni0.1 (OH)PO4 and Co1.7Ni0.3(OH)PO4, respectively. Specific heat data present peaks at 68 and 61 K for Co1.9Ni0.1 and Co1.7Ni0.3, respectively. These peaks show broad shoulders between approximately 15 and 40 K. The lack of any distinguishable anomaly below 10 K supports the spin glass nature of the low temperature transitions. Refinement of room temperature neutron diffraction data indicates that the Ni(II) ions are in octahedral co-ordination with the practical absence of these ions in the trigonal bipyramidal sites. The magnetic structures of CO2-xNix(OH)PO4 consist of ferromagnetic arrangements between the octahedral chains and trigonal bipyramidal dimers within the xz plane with the magnetic moments along the z axis. The ferromagnetic layers are disposed antiparallel to one another along the y direction establishing the three-dimensional anti ferro magnetic order (T-N approximate to 70 K for Co1.9Ni0.1 and approximate to 64 K for Co1.7Ni0.3). The different exchange pathways, the anisotropy of the Co(II) ions and the frustration of the magnetic moments in the trigonal bipyramidal geometry could be responsible for the freezing process.', '', '', '', '', '', '', '', 13, 13, '', '', '', '0953-8984', '', '', '', 'APR 19 200', '2006', '18', '15', '', '', '', '3767', '3787', '', '10.1088/0953-8984/18/15/021', '', '', '', '', '', '', 'WOS:0', 0, 0),
(220, '', 'J', 'Martin, LOS;Chapman, JP;Lezama, L;Marcos, JS;Rodriguez-Fernandez, J;Arriortua, MI;Rojo, T;', '', '', '', '', '', 'Magnetic properties of the ordered double perovskite Sr2MnTeO6', 'EUROPEAN JOURNAL OF INORGANIC CHEMISTRY', '', '', '', '', '', '', '', '', '', '', 'The ordered double perovskite Sr2MnTeO6 was prepared by the freeze-drying method. The nuclear and magnetic structures were determined by both X-ray and neutron (D2B and D1B) powder diffraction. A distorted, double perovskite structure type described by the monoclinic P12(1)/n1 space group is observed at room temperature and down to 4 K. The room temperature EPR spectrum shows an isotropic signal centered at a g value of 1.998 indicating that manganese ions are in the +2 oxidation state. At low temperature the EPR signal broadens as the exchange and dipolar interactions between Mn2+ cations increase. Below 25 K no signal is observed, indicating that the sample is magnetically ordered. The dc magnetic susceptibility shows the existence of antiferromagnetic interactions with an ordering temperature around 20 K. A sharp lambda-type anomaly observed at 19 K in the specific heat curve and refinement of low-temperature neutron diffraction data confirm the presence of a three-dimensional, antiferromagnetic ordered structure with an ordering temperature of ca. 23 K. The propagation vector of the magnetic structure is k = [0,0,0], yielding a type I antiferromagnetic ordering between Mn2+ (S = 5/2) cations. At 2 K, each manganese ion is antiferromagnetically aligned to 8 out of 12 nearest-neighbors at an approximate distance of 5.6 angstrom. This magnetic structure can be viewed as being composed of ferromagnetic arrangement of Mn2+ moments in the ab plane, coupled antiferromagnetically along the c axis. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006).', '', '', '', '', '', '', '', 3, 3, '', '', '', '1434-1948', '', '', '', 'APR 3 2006', '2006', '', '7', '', '', '', '1362', '1370', '', '10.1002/ejic.200500880', '', '', '', '', '', '', 'WOS:0', 0, 0),
(221, '', 'J', 'Ortega-San Martin, L.;Chapman, J.P.;Lezama, L.;Saiz Garitaonandia, J.J.;Sanchez Marcos, J.;Rodriguez-Fernandez, J.;Arriortua, M.L.;Rojo, T.;', '', '', '', '', '', 'Spin-glass behaviour in the double perovskite "Sr 2FeTeO 6" due to mis-site disorder and cation vacancy formation ', 'Journal of Materials Chemistry', '', '', '', '', '', '', '', '', '', '', 'The double perovskite of nominal composition Sr 2FeTeO 6 has been prepared by the freeze-drying method. Simultaneous Rietveld refinement of X-ray and high resolution D2B neutron diffraction data has shown it to have space group I12/m1 but with a significant degree of pseudo-tetragonal symmetry with a = 5.6080(3) Aring, b = 5.5952(3) Aring, c = 7.9081(5) Aring and beta = 90deg, and a far more complex cation distribution over the B- and B''-sites. Refinement of Fe and Te fractions over these sites yielded the composition (Fe 0.84square 0.16) B(Te 0.87Fe 0.13) B''. This, and the absence of any significant formation of oxygen vacancies, yields an oxidation state for Fe close to +3, confirmed by EPR measurements (g ~ 2.00). The disorder found over the B- and B''-sites implies that each Fe 3+O 6 octahedron is coordinated to six species, each of which can be Te, square or another Fe, producing a statistical distribution of exchange pathways. The presence of several signals in the room temperature 57Fe Mossbauer spectrum and the broadening of the ESR signals can be related to this statistical distribution of the coordination environments around Fe 3+. Magnetic DC susceptibility measurements indicate that the most important interactions are of antiferromagnetic nature. Absence of magnetic peaks in the 4 K neutron diffraction data, divergence below 40 K of field-cooled and zero-field-cooled DC susceptibilities, the frequency dependence of chiprime; and chi" magnetic AC susceptibilities and the lack of a three-dimensional lambda-type peak in the specific heat measurements are all consistent with spin-glass type behaviour, as expected from the variety of frustrated magnetic interactions arising from the observed mis-site disorder and vacancies.', '', '', '', '', '', '', '', 5, 5, '', '', '', '0959-9428', '', '', '', '7 Jan. 200', '2006', '16', '1', '', '', '', '66', '76', '', '10.1039/b512551k', '', '', '', '', '', '', 'INSPE', 0, 0),
(226, '', 'J', 'Ortega-San Martin, L;Chapman, JP;Lezama, L;Sanchez-Marcos, J;Rodriguez-Fernandez, J;Arriortua, MI;Rojo, T;', '', '', '', '', '', 'Factors determining the effect of Co(II) in the ordered double perovskite structure: Sr2CoTeO6', 'JOURNAL OF MATERIALS CHEMISTRY', '', '', '', '', '', '', '', '', '', '', 'Double perovskites are of interest due to their diverse properties that are of potential use in technological applications. In order to determine the effect of Co(II) in the double perovskite structure in the absence of other paramagnetic species, mixed valency or mis-site disorder, we have studied the ordered perovskite Sr2CoTeO6 synthesised by the freeze-drying method. The room temperature monoclinic P2(1)/n symmetry (a = 5.6437(2) Angstrom, b = 5.6096(2) Angstrom, c = 7.9271(2) Angstrom, beta = 90.059(2)degrees) is maintained down to 4 K with structural transitions to I2/m then Fm(3) over bar m at 373 K (100degreesC) and 773 K (500degreesC). Below T-N = 18 K, the Type I antiferromagnetic structure is observed with magnetic moments of magnitude 2.25(3)mu(B) rotated 58degrees out of the ab plane. AC magnetic susceptibility and specific heat data show maxima at 19 K, associated with long-range antiferromagnetic order. EPR and diffuse reflectance spectroscopies confirm that Co is in the +2 oxidation state, in highly regular octahedral coordination and is highly ionic. A small magnetic irreversibility, with H-c and M-r of 36 Oe and 0.5 emu mol 21, is observed at low temperature but this is not due to conventional spin glass or cluster glass behaviour. Calculations from specific heat give a magnetic entropy of 4.2 J mol(-1) K-1, close to the theoretical value for the S'' = 1/2 state of the Co2+ cation at low temperature. Distortions of the structure, demonstrated to be primarily rotations of highly regular octahedra, change the geometry of the magnetic exchange pathways but are insufficient to explain the variation in ordering temperatures and magnetic structure types observed, with orbital energies within the exchange pathways having a significant influence on the properties of these and similar technologically important materials.', '', '', '', '', '', '', '', 10, 10, '', '', '', '0959-9428', '', '', '', '2005', '2005', '15', '1', '', '', '', '183', '193', '', '10.1039/b413341b', '', '', '', '', '', '', 'WOS:0', 0, 0),
(223, '', 'J', 'Chevalier, B;Marcos, JS;Fernandez, JR;Pasturel, M;Weill, F;', '', '', '', '', '', 'From intermediate valence to magnetic behavior without long-range order by hydrogenation of the ternary gallide CeNiGa', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'We have studied both the crystal chemistry and magnetic, transport, and thermal properties of the hydride CeNiGaH1.1(1). This compound crystallizes in the hexagonal AlB2-type structure with a random distribution of nickel and gallium atoms on the B site, which has an important influence upon the macroscopic properties. Its thermoelectric power versus temperature indicates that cerium is in a trivalent state. The electrical resistivity displays two minima, which could be expected for the Kondo-type interactions in the presence of crystal field effects. Specific heat measurements up to 300 K allow us to determine the splitting energies Delta(1)=100 K and Delta(2)=159 K. A broad maximum is observed around 4 K in the specific heat in the low temperature region. This maximum and its evolution with the applied magnetic field, are discussed in the framework of the existing theories, which point toward the existence of short-range magnetic correlations and spin glasslike freezing below 1.8 K. This study reveals: (i) that the hydrogenation of the intermediate valence gallide CeNiGa induces a valence transition for cerium which is purely trivalent in the hydride and (ii) the absence above 1.8 K of long-range magnetic ordering resulting from structural disorder around Ce atoms.', '', '', '', '', '', '', '', 12, 12, '', '', '', '1098-0121', '', '', '', 'JUN 2005', '2005', '71', '21', '', '', '', '', '', '214437', '10.1103/PhysRevB.71.214437', '', '', '', '', '', '', 'WOS:0', 0, 0),
(224, '', 'J', 'Chevalier, B;Bobet, JL;Marcos, JS;Fernandez, JR;Sal, JCG;', '', '', '', '', '', 'Magnetocaloric properties of amorphous GdNiAl obtained by mechanical grinding', 'APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING', '', '', '', '', '', '', '', '', '', '', 'An amorphous GdNiAl sample was prepared by mechanical grinding performed on a crystallised intermetallic. The treatment changes greatly the ferromagnetic behaviour of this compound; its Curie temperature decreases from 57 K (unmilled sample) to 29 K ( milled sample). Specific heat and magnetisation measurements reveal that amorphous GdNiAl exhibits an interesting magnetocaloric effect; for an applied magnetic field of 5 T a change of congruent to 8.9 J/kg K is observed at 36 K for the isothermal magnetic entropy.', '', '', '', '', '', '', '', 12, 12, '', '', '', '0947-8396', '', '', '', 'FEB 2005', '2005', '80', '3', '', '', '', '601', '606', '', '10.1007/s00339-003-2239-9', '', '', '', '', '', '', 'WOS:0', 0, 0),
(227, '', 'J', 'Bazan, B;Mesa, JL;Pizarro, JL;Rodriguez-Fernandez, J;Sanchez-Marcos, J;Roig, A;Molins, E;Arriortua, MI;Rojo, T;', '', '', '', '', '', 'Thermal transformation of (NH4)[Fe(AsO4)F] into the new textural porous orthorhombic Fe(AsO4)Phase. Crystal structures, thermal behavior, and spectros', 'CHEMISTRY OF MATERIALS', '', '', '', '', '', '', '', '', '', '', '(NH4)[Fe(AsO4)F] 1 has been synthesized under mild hydrothermal conditions. Single crystals of this phase heated under air atmosphere at 525 degreesC in a tubular furnace gave single crystals of the new polymorphous Fe(AsO4) 2. The crystal structure of both compounds has been determined from X-ray single-crystal diffraction data. Compound 1 crystallizes in the orthorhombic Pna2(1) space group with unit-cell parameters of a = 13.270(2) A, b = 6.629(l) Angstrom, c = 10.866(1) Angstrom, V = 955.8(2) Angstrom(3), and Z = 8. Compound 2 belongs to the orthorhombic space group Imam, the unit cell parameters are a = 13.468(2) Angstrom, b = 6.525(1) Angstrom, c = 10.768(2) Angstrom, V = 946.3(3) Angstrom(3), and Z = 12. The crystal structure of compound 1 consists of a three-dimensional framework with chains formed by alternating Fe(2)O4F2 or Fe(1)O4F2 octahedra and As(2)O-4 or As(1)O-4 tetrahedra, respectively, linked by a common oxygen vertex. These chains run along the a and b axes of the crystal structure. The crystal structure of 2 is formed by a three-dimensional skeleton, constructed from sheets stacked along the [001] direction and interconnected by chains of alternating Fe(2)O-6 octahedra, sharing vertex with the As(2)O-4 tetrahedra. Transmission electronic microscopy of 2 indicates the existence of unconnected external and internal cavities with a BET surface area of 1.57(2) m(2) g(-1). The diffuse reflectance spectra in the visible region show the forbidden electronic transitions characteristic of the d(5) high spin cations in slightly distorted octahedral geometry. The Mossbauer spectra of both phases at 300 K are characteristic of iron(III) cations. For each phase two sextets with similar isomer shifts and internal hyperfine fields of approximately 50 T were observed at 4.2 K. The ESR spectra from room temperature to 4.2 K remain isotropic with variation in temperature; the g-value being 1.99(l). The magnetic measurements at low temperatures indicate the predominance of antiferromagnetic interactions, with the Neel temperature being 68.0 and 54.5 K for compounds I and 2, respectively. For both phases the existence of weak ferromagnetic components, giving rise to small hysteresis loops, was also detected at very low temperatures.', '', '', '', '', '', '', '', 12, 13, '', '', '', '0897-4756', '', '', '', 'DEC 14 200', '2004', '16', '25', '', '', '', '5249', '5259', '', '10.1021/cm040161s', '', '', '', '', '', '', 'WOS:0', 0, 0),
(228, '', 'J', 'Chevalier, B;Pasturel, M;Bobet, JL;Decourt, R;Etourneau, J;Isnard, O;Marcos, JS;Fernandez, JR;', '', '', '', '', '', 'Hydrogenation of the ternary compounds CeNiX (X = Al, Ga, In, Si, Ge and Sn): influence on the valence state of cerium', 'JOURNAL OF ALLOYS AND COMPOUNDS', '', '', '', '', '14th International Conference on Solid Compounds of Transition Elements (SCTE 2003)', 'JUL 06-11,', 'Johannes Kepler Univ Linz, Linz, AUSTRIA', 'Land Oberosterreich; Stadt Linz; Sparkasse Oberosterreich; Energie AG Oberosterreich', '', '', 'The hydrogenation process of the intermediate valence compounds CeNiAl, CeNiGa, CeNiIn, CeNiSi and CeNiGe and of the Kondo semiconductor stannide CeNiSn has been investigated. Magnetization and electrical resistivity measurements reveal interesting physical transition induced by the insertion of hydrogen: (i) the Kondo temperature decreases from 600(20) to 220(10) K in the sequence CeNiGe --> CeNiGeH1.6(1); (ii) the hydrides CeNiAlH1.93(5) and CeNiGaH1.1(1) contain cerium in trivalent state and the former shows the presence of magnetic correlations around 3.6(2) K; (iii) in contrast, CeNiInH1.8(2) presents a ferromagnetic transition at T-C = 6.8(2) K and a magnetic transition Kondo semiconductor --> antiferromagnet (T-N = 4.5(2) K) --> ferromagnet (T-C = 7.0(2) K) is evidenced in the CeNiSnHY system. These results are explained by a modification of the competition between RKKY magnetic interaction and Kondo interaction induced by the hydrogenation of these intermetallics. (C) 2004 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 34, 34, '', '', '', '0925-8388', '', '', '', 'NOV 30 200', '2004', '383', '1-2', '', '', '', '4', '9', '', '10.1016/j.jallcom.2004.04.006', '', '', '', '', '', '', 'WOS:0', 0, 0),
(229, '', 'J', 'Chevalier, B;Pasturel, M;Bobet, JL;Etourneau, J;Isnard, O;Marcos, JS;Fernandez, JR;', '', '', '', '', '', 'Magnetic ordering induced by the hydrogenation of the ternary stannide CeNiSn', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', '', '', 'International Conference on Magnetism (ICM 2004)', 'JUL 27-AUG', 'Rome, ITALY', '', '', '', 'dThe new hydrides CeNiSnH1.0(2) and CeNiSnH1.8(2) have been investigated by X-ray powder diffraction, magnetization, electrical resistivity and specific heat measurements. The hydrogen insertion into CeNiSn reveals an interesting magnetic transition: Kondo insulator (CeNiSn)--> antiferromagnet (CeNiSnH1.0(2)) ferromagnet (CeNiSnH1.8(2)). The physical properties of these compounds are influenced by the Kondo effect. (C) 2003 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 16, 16, '', '', '', '0304-8853', '', '', '', 'MAY 2004', '2004', '272', '', 'SI', '1', '', '576', '578', '', '10.1016/j.jmmm.2003.11.222', '', '', '', '', '', '', 'WOS:0', 0, 0),
(230, '', 'J', 'Marcos, JS;Fernandez, JR;Chevalier, B;Bobet, JL;Etourneau, J;', '', '', '', '', '', 'Heat capacity and magnetocaloric effect in polycrystalline and amorphous GdMn2', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', '', '', 'International Conference on Magnetism (ICM 2004)', 'JUL 27-AUG', 'Rome, ITALY', '', '', '', 'The Laves phases GdMn2 has been recently prepared in amorphous structure. We present heat capacity measurements under magnetic fields up to 9T in both polycrystalline and amorphous states. No distinguishable anomaly at the magnetic order temperature is observed in the amorphous sample. In both cases a very low field dependence of the heat capacity is observed. The calculated magnetocaloric effects give rise to a maximum centred at 37 K in the crystalline form and a low, but broad maximum centred at 130 K in the amorphous sample. (C) 2003 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 10, 10, '', '', '', '0304-8853', '', '', '', 'MAY 2004', '2004', '272', '', 'SI', '1', '', '579', '580', '', '10.1016/j.jmmm.2003.11.225', '', '', '', '', '', '', 'WOS:0', 0, 0),
(231, '', 'J', 'de Pedro, I.;Jubera, V.;Rojo, J. M.;Lezama, L.;Sanchez Marcos, J.;Rodriguez Fernandez, J.;Mesa, J. L.;Rojo, T.;Arriortua, M. I.;', '', '', '', '', '', 'Magnetic properties of Co2-xCux(OH) PO4 (x=0, 1 and 2)', 'JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS', '', '', '', '', '', '', '', '', '', '', 'The isostructural Co2-xCux(OH) PO4 (x = 0, 1 and 2) phases have been prepared from hydrothermal synthesis and characterized from powder X-ray diffraction. The structure consists of a three-dimensional framework in which M(1) O-5-trigonal bipyramid dimers and M(2) O-6-octahedral chains are simultaneously present. Magnetization measurements of Co-2(OH)(PO4) show the existence of two maxima attributed to a three-dimensional antiferromagnetic ordering at 70 K and a spin-glass-like state at 12 K. When Co2+ is substituted by Cu2+ ions, the spin-glass behavior disappears and the magnetic order is decreased. (C) 2004 Elsevier B. V. All rights reserved.', '', '', '', '', '', '', '', 4, 4, '', '', '', '0304-8853', '', '', '', 'MAY 2004', '2004', '272', '', '', '', '1', 'E665', 'E666', '', '10.1016/j.jmmm.2003.11.331', '', '', '', '', '', '', 'WOS:0', 0, 0),
(232, '', 'J', 'de Pedro, I;Rojo, JM;Jubera, V;Fernandez, JR;Marcos, JS;Lezama, L;Rojo, T;', '', '', '', '', '', 'Effect of Ni2+ (S=1) and Cu2+ (S=1/2) substitution on the antiferromagnetic ordered phase Co-2(OH)PO4 with spin glass behaviour', 'JOURNAL OF MATERIALS CHEMISTRY', '', '', '', '', '', '', '', '', '', '', 'The hydroxyphosphates with formula Co1.7M0.3(OH)PO4 ( M = Ni, Cu) have been prepared from hydrothermal synthesis. The compounds have been characterized by X-ray powder diffraction and spectroscopic measurements. Diffuse reflectance data of both phases show bands belonging to the two chromophores, octahedral and trigonal bipyramidal, of the Co(II) ions together with others associated to the chromophores of nickel(II) and copper(II) ions. Magnetization measurements of Co1.7Ni0.3(OH) PO4 show the presence of two maxima at ca. 62 and 5 K, respectively. The first peak was attributed to a three-dimensional antiferromagnetic ordering and the second one reveals the existence of a spin glass-like state. This behaviour was confirmed from the ac measurements obtained at different frequencies and applied fields. The Co1.7Cu0.3(OH) PO4 phase exhibits only one maximum at 65 K in both chi(m) and ac measurements associated to the three-dimensional antiferromagnetic interactions; however, the existence of spin glass behaviour is not observed. ZFC-FC curves for the cobalt - nickel and cobalt - copper compounds show irreversibility just below T-N indicating the existence of higher spin decompensations than in the Co-2(OH)PO4 phase. This difference and its influence in the magnetic anomalies observed at low temperatures is the more important effect in the magnetic measurements of the ordered Co-2(OH) PO4 phase substituted at about 15% of the Co2+ (S = 3/2) by Ni2+ (S = 1) or Cu2+ (S = 1/2) ions. The origin of the frustration, which is necessary to achieve a disordered ground state, is investigated in these kinds of spin glass compounds. Taking into account the possible magnetic exchange pathways, which are essential to install competition and ensure cooperativeness of the freezing process, correlations between structural and magnetic properties have been performed.', '', '', '', '', '', '', '', 16, 16, '', '', '', '0959-9428', '', '', '', '2004', '2004', '14', '7', '', '', '', '1157', '1163', '', '10.1039/b313999a', '', '', '', '', '', '', 'WOS:0', 0, 0),
(233, '', 'J', 'Rodriguez Fernandez, J.;Sanchez Marcos, J.;Espeso, J.I.;Gomez Sal, J.C.;McEwen, K.A.;', '', '', '', '', '', 'High temperature electrical resistivity in U 1-xLa xPt compounds ', 'Journal of Alloys and Compounds', '', '', '', '', '4th International Conference on F-Elements', '17-21 Sept', 'Madrid, Spain', '', '', '', 'We present electrical resistivity measurements on U 1-xLa xPt (x=0, 0.1, 0.2, 0.5, 0.8, 0.9, 1) between 2 and 1000 K. The compounds exhibiting ferromagnetic behaviour (xles0.3) display a maximum at low temperatures and some of them a minimum at higher temperatures. For the non-ordered compounds (xges0.5) the resistivity increases continuously with temperature. A common feature of the U-rich compounds is the existence of a negative logarithmic temperature dependence of the total resistivity above the maximum, whereas a combination of a linear term plus a logarithmic term is found for the others. Under a Kondo-like framework, a breakdown of the Mattiessen rule is suggested.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0925-8388', '', '', '', '12 July 20', '2001', '323-3', '', '', '', '', '384', '8', '', '10.1016/S0925-8388(01)01067-2', '', '', '', '', '', '', 'INSPE', 0, 0),
(313, '', 'J', 'Kabtoul, B.;Rioboo, R. J. Jimenez;Ramos, M. A.;', '', '', '', '', '', 'Thermal and acoustic experiments on polymorphic ethanol', 'PHILOSOPHICAL MAGAZINE', '', '', '', '', '11th International Workshop on Complex Systems', 'MAR 17-20,', 'Andalo, ITALY', 'Univ Trento, Dipartimento Fis; INFM CNR SOFT; Off Naval Res', '', '', 'Calorimetric and acoustic experiments were conducted on pure ethanol in the temperature range around 80-180 K, in which different solid-solid and solid-liquid transitions are observed. Using a versatile calorimetric experimental system, the specific heats of the different phases were accurately measured and the phase transitions between them investigated. The latter investigation was supported by complementary Brillouin-scattering experiments. The influence of several factors in the kinetics of crystallization versus vitrification is demonstrated and briefly discussed.', '', '', '', '', '', '', '', 4, 4, '', '', '', '1478-6435', '', '', '', '2008', '2008', '88', '33-35', '', '', '', '4197', '4203', '', '10.1080/14786430802484881', '', '', '', '', '', '', 'WOS:0', 0, 0),
(320, '', 'J', 'JIMENEZ, R;BOHN, KP;KRUGER, JK;PETERSSON, J;', '', '', '', '', '', 'BRILLOUIN INVESTIGATIONS OF THE PHASES AND PHASE-TRANSITIONS IN THE MIXED-CRYSTAL NA(CN)XCL1-X', 'FERROELECTRICS', '', '', '', '', '7TH INTERNATIONAL MEETING ON FERROELECTRICITY ( IMF 7 )', 'AUG 28-SEP', 'SAARBRUCKEN, FED REP GER', 'INT UNION PURE & APPL PHYS; EUROPEAN PHYS SOC; GERMAN PHYS SOC; DEUT FORSCHUNGSGEMEINSCH; DEUT AKAD ', '', '', NULL, '', '', '', '', '', '', '', 6, 6, '', '', '', '0015-0193', '', '', '', '1990', '1990', '106', '', '', '', '', '175', '180', '', '10.1080/00150199008214579', '', '', '', '', '', '', 'WOS:A', 0, 0),
(319, '', 'J', 'KRUGER, JK;JIMENEZ, R;BOHN, KP;PETERSSON, J;ALBERS, J;KLOPPERPIEPER, A;SAUERLAND, E;MUSER, HE;', '', '', '', '', '', 'ACOUSTIC, OPTOACOUSTIC, AND THERMAL-PROPERTIES INVESTIGATED AROUND THE PHASE-TRANSITIONS OF NACN AND NA(CN)XCL1-X MIXED-CRYSTALS', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', NULL, '', '', '', '', '', '', '', 21, 21, '', '', '', '0163-1829', '', '', '', 'NOV 1 1990', '1990', '42', '13', '', 'B', '', '8537', '8547', '', '10.1103/PhysRevB.42.8537', '', '', '', '', '', '', 'WOS:A', 0, 0),
(254, '', 'J', 'Jimenez Rioboo, R. J.;Brien, V.;Pigeat, P.;', '', '', '', '', '', 'Elastic properties in different nano-structured AlN films', 'JOURNAL OF MATERIALS SCIENCE', '', '', '', '', '', '', '', '', '', '', 'A study of the transverse acoustic phonons on nano-structured AlN films has been carried out by using high-resolution micro-Brillouin spectroscopy. Dense films have been deposited by radio frequency (r.f.) magnetron sputtering under ultra high vacuum at room temperature. Films with different morphologies were prepared and investigated by transmission electron microscopy and Brillouin Spectroscopy (equiaxed nano-sized, nano-columnar grains and amorphous phase). Results show a dependence of the transverse modes on the nano-structure. The nano-columnar film exhibits two transversal modes as expected for the AlN wurtzite while the equiaxed nano-sized and the amorphous films only exhibit one isotropic transverse mode as expected in amorphous materials. One important result is that the sound propagation velocity in the AlN amorphous phase is higher than the one in the non-textured nano-crystalline phase. This phenomenon has, however, already been observed in ferroelectric ceramics.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0022-2461', '', '', '', 'JAN 2010', '2010', '45', '2', '', '', '', '363', '368', '', '10.1007/s10853-009-3944-3', '', '', '', '', '', '', 'WOS:0', 1, 0),
(318, '', 'J', 'KRUGER, JK;SCHREIBER, J;JIMENEZ, R;BOHN, KP;SMUTNY, F;KUBAT, M;PETZELT, J;HRABOVSKABRADSHAW, J;KAMBA, S;LEGRAND, JF;', '', '', '', '', '', 'UNCONVENTIONAL ORIENTATIONAL GLASS TRANSITIONS IN SYMMETRICAL DIFLUOROTETRACHLOROETHANE', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'Frozen-in trans and gauche conformational disorder of symmetrical difluorotetrachloroethane (DFTCE) produces the tendency of this plastic crystal to form an orientational glassy state on cooling below T(g) = 86 K. To throw light upon the freezing mechanism in DFTCE neutron diffraction and Brillouin scattering as well as infrared and dielectric measurements are employed. The overall picture of the results obtained can be characterized in terms of a classical glass-transition process with a relaxation frequency obeying the Vogel-Fulcher law. However, a more sophisticated picture of the freezing process is indicated by a quantitative analysis of the new Brillouin data, e.g. the temperature dependence of the sound velocity. The behaviour could be understood on the basis of a mode-coupling theory.', '', '', '', '', '', '', '', 19, 19, '', '', '', '0953-8984', '', '', '', 'AUG 29 199', '1994', '6', '35', '', '', '', '6947', '6964', '', '10.1088/0953-8984/6/35/006', '', '', '', '', '', '', 'WOS:A', 0, 0),
(316, '', 'J', 'JIMENEZ, R;KRUGER, JK;FISCHER, C;BOHN, KP;DVORAK, V;HOLAKOVSKY, J;ALNOT, P;', '', '', '', '', '', 'ELASTIC SOFTENING IN THE ROTATOR PHASE OF THE PERFLUOROALKANE C24F50', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', NULL, '', '', '', '', '', '', '', 6, 6, '', '', '', '0163-1829', '', '', '', 'FEB 1 1995', '1995', '51', '6', '', '', '', '3353', '3361', '', '10.1103/PhysRevB.51.3353', '', '', '', '', '', '', 'WOS:A', 0, 0),
(317, '', 'J', 'JIMENEZ, R;KRUGER, JK;PRECHTL, M;GRAMMES, C;ALNOT, P;', '', '', '', '', '', 'PREMELTING FEATURES AND ACOUSTIC MODE SOFTENING IN THE ROTATOR PHASES OF LINEAR TELOMERS - C17H36', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'The polymer induced alignment (PIA) technique is presented as a new technique to grow single-crystalline films of linear telomers. Combining the PIA technique with special high-resolution Brillouin techniques, it is possible to determine the coefficients of the elastic stiffness tenser of the crystalline state of linear telomers, especially in their rotator phases. As model systems we have chosen the perfluoroalkane C20F42 and the linear n-alkane C17H36. A comparison of elastic data obtained from classically and PIA grown samples proves their equivalence as well as their complementarity. Precursors of critical melting discovered in the rotator phase of C17H36 are discussed in terms of the anomalous temperature dependence of certain elastic tenser coefficients and of related n-telomers.', '', '', '', '', '', '', '', 15, 15, '', '', '', '0953-8984', '', '', '', 'DEC 12 199', '1994', '6', '50', '', '', '', '10977', '10988', '', '10.1088/0953-8984/6/50/008', '', '', '', '', '', '', 'WOS:A', 0, 0),
(315, '', 'J', 'KRUGER, JK;GRAMMES, C;JIMENEZ, R;SCHREIBER, J;BOHN, KP;BALLER, J;FISCHER, C;ROGEZ, D;SCHORR, C;ALNOT, P;', '', '', '', '', '', '2ND-ORDER ELASTICITY OF LIQUID-CRYSTALS WITHIN THEIR NEMATIC STATE AT HIGH-FREQUENCIES', 'PHYSICAL REVIEW E', '', '', '', '', '', '', '', '', '', '', NULL, '', '', '', '', '', '', '', 9, 9, '', '', '', '1063-651X', '', '', '', 'MAR 1995', '1995', '51', '3', '', 'A', '', '2115', '2128', '', '10.1103/PhysRevE.51.2115', '', '', '', '', '', '', 'WOS:A', 0, 0),
(314, '', 'J', 'Kruger, JK;Bohn, KP;Jimenez, R;Schreiber, J;', '', '', '', '', '', 'On the existence of an intrinsic glass transition in a fragile liquid: Polyvinylacetate', 'COLLOID AND POLYMER SCIENCE', '', '', '', '', '', '', '', '', '', '', 'Time domain Brillouin spectroscopy has been used as a definitive experimental approach to demonstrate the intrinsic nature of the thermal glass transition in Polyvinylacetate. The transition from the equilibrium liquid to the ideal glassy state appears at the ultimate temperature T-gs.', '', '', '', '', '', '', '', 15, 15, '', '', '', '0303-402X', '', '', '', 'MAY 1996', '1996', '274', '5', '', '', '', '490', '495', '', '10.1007/BF00652473', '', '', '', '', '', '', 'WOS:A', 0, 0),
(253, '', 'J', 'Ben Youssef, Ismail;Alem, Halima;Sarry, Frederic;Elmazria, Omar;Jimenez Rioboo, Rafael;Arnal-Herault, Carole;Jonquieres, Anne;', '', '', '', '', '', 'Functional poly(urethane-imide) s containing Lewis bases for SO2 detection by Love surface acoustic wave gas micro-sensors', 'SENSORS AND ACTUATORS B-CHEMICAL', '', '', '', '', '', '', '', '', '', '', 'Functional polymers containing Lewis bases are known as promising materials for the elaboration of highly sensitive micro-sensors for acid gas detection. In this work, poly(urethane-imide)s (PUIs) with Lewis bases were synthesized in two steps only from various functional diols (N-methyldiethanolamine, N-tert-butyldiethanolamine, N-phenyldiethanolamine and 1,4-diethanolpiperazine) containing one or two tertiary amine groups with different chemical structures. The synthesis led to high yields, high molecular weights and a good control of the PUI amine content. These good film-forming polymers were then used as SO2 sensitive coatings on Love surface acoustic wave (L-SAW) micro-sensors. The physical and mechanical properties required for an optimal micro-sensor design were determined by High Resolution Brillouin Spectroscopy of PUI thin layers. Three-layer micro-sensors were developed by respecting the conditions for the L-SAW generation. The three-layer structure included Quartz ST-90 as the piezoelectric substrate, a ZnO guiding layer and a PUI sensitive layer. These micro-sensors were weakly sensitive to temperature and thus compatible with the targeted application. The experimental results for SO2 detection showed that all the PUI coatings greatly improved the sensitivity compared to a micro-sensor without polymer coating. The basicity of the amine groups was not determining for the micro-sensor sensitivity to the SO2 acid gas and the key factor was their steric hindrance. Finally, the micro-sensor sensitivity increased with the accessibility of the amine groups in the order Piperazinediol < tBu-DEA congruent to Ph-DEA << MDEA. (C) 2013 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0925-4005', '', '', '', 'AUG 2013', '2013', '185', '', '', '', '', '309', '320', '', '10.1016/j.snb.2013.04.120', '', '', '', '', '', '', 'WOS:0', 1, 0),
(244, '', 'J', 'FISCHER, C;KRUGER, JK;BOHN, KP;VOGT, U;SCHREIBER, J;JIMENEZ, R;WOLF, D;LEGRAND, JF;ALNOT, P;SERVET, B;', '', '', '', '', '', 'ABOUT THE MICROSTRUCTURE OF PCVD PREPARED CRYSTAL MATS OF STATISTICAL OLIGO-VINYLIDENE-FLUORIDE-TRIFLUOROETHYLENE IN RELATION TO OTHER FLUORINATED POL', 'JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The room temperature phase of the physical/chemical vapor-deposited statistical co-oligomer VDF/TrFE(70/30) has been characterized by different experimental methods such as small-angle x-ray scattering, wide-angle x-ray diffraction, size-exclusion chromatography, infrared absorption and optical refractometry. The characterization of the elastic properties was carried out using high-performance Brillouin spectroscopy in connection with special scattering geometries. The co-oligomer VDF/TrFE(70/30) was obtained by cracking the parent statistical copolymer and subsequently vapor depositing the shortened chains on highly oriented PTFE substrates (PIA-technique). The room temperature phase of the resulting oriented waxy crystal mats of VDF/TrFE(70/30) is predominantly ferroelectric. The physical properties are very different to those of similarly PIA-prepared n-alkanes, perfluoroalkanes, and blockfluoroalkanes. The microstructure of VDF/TrFE(70/30) is interpreted in terms of partially crystalline nano-sized structures giving rise to a marked freezing process below room temperature. (C) 1995 John Wiley and Sons, Inc.', '', '', '', '', '', '', '', 4, 4, '', '', '', '0887-6266', '', '', '', 'JAN 30 199', '1995', '33', '2', '', '', '', '237', '246', '', '10.1002/polb.1995.090330208', '', '', '', '', '', '', 'WOS:A', 0, 0),
(245, '', 'J', 'Sanctuary, Roland;Philipp, Martine;Mueller, Ulrich;Possart, Wulff;Jimenez-Rioboo, Rafael;Krueger, Jan Kristian;', '', '', '', '', '', 'Space and time resolving molecular acoustics as a tool to visualize epoxy formation at a planar hardener-resin interface', 'CHEMICAL PHYSICS LETTERS', '', '', '', '', '', '', '', '', '', '', 'Scanning Brillouin microscopy visualizes the temporal evolution of a heterogeneous hypersonic pro. le during chemical reactions and transport processes around a planar phase boundary between an epoxy resin and hardener. The hypersonic investigations are interpreted in terms of structural formation and annihilation in the layered sample and are compared to results obtained for a well mixed bulk sample of the same composition of reactants. Chaotic transport channels are made responsible for the creation of local glassy heterogeneities not observable in the bulk material on a macroscopic level. (C) 2009 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 6, 6, '', '', '', '0009-2614', '', '', '', 'JUL 7 2009', '2009', '476', '1-3', '', '', '', '11', '14', '', '10.1016/j.cplett.2009.05.076', '', '', '', '', '', '', 'WOS:0', 0, 0),
(246, '', 'J', 'Philipp, M.;Mueller, U.;Jimenez Rioboo, R. J.;Baller, J.;Sanctuary, R.;Possart, W.;Krueger, J. K.;', '', '', '', '', '', 'Interphases, gelation, vitrification, porous glasses and the generalized Cauchy relation: epoxy/silica nanocomposites', 'NEW JOURNAL OF PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The generalized Cauchy relation (gCR) of epoxy/silica nano-composites does not show either the chemically induced sol-gel transition or the chemically induced glass transition in the course of polymerization. Astonishingly, by varying the silica nanoparticles'' concentration between 0 and 25 vol% in the composites, the Cauchy parameter A of the gCR remains universal and can be determined from the pure epoxy''s elastic moduli. Air-filled porous silica glasses are considered as models for percolated silica particles. A longitudinal modulus versus density representation evidences the aforementioned transition phenomena during polymerization of the epoxy) silica nanocomposites. The existence of optically and mechanically relevant interphases is discussed.', '', '', '', '', '', '', '', 3, 3, '', '', '', '1367-2630', '', '', '', 'FEB 9 2009', '2009', '11', '', '', '', '', '', '', '023015', '10.1088/1367-2630/11/2/023015', '', '', '', '', '', '', 'WOS:0', 0, 0),
(247, '', 'J', 'Kruger, JK;Embs, JP;Lukas, S;Hartmann, U;Brierley, CJ;Beck, CM;Jimenez, R;Alnot, P;', '', '', '', '', '', 'Hypersonic properties of nano- and microstructured CVD diamond', 'DIAMOND AND RELATED MATERIALS', '', '', '', '', '', '', '', '', '', '', 'Basic information related to the acoustic dispersion, local sound velocity distribution and influence of the grain size on the elastic properties of white plasma-assisted chemical vapour-deposited diamond has been obtained by a new Brillouin scattering technique. The obtained results show no acoustic dipersion and the existence of internal stresses that influence the elastic properties of the diamond sample. (C) 2000 Elsevier Science S.A. All rights reserved.', '', '', '', '', '', '', '', 15, 15, '', '', '', '0925-9635', '', '', '', 'FEB-MAR 20', '2000', '9', '2', '', '', '', '123', '128', '', '10.1016/S0925-9635(99)00230-7', '', '', '', '', '', '', 'WOS:0', 0, 0),
(248, '', 'J', 'Kruger, JK;Embs, JP;Lukas, S;Hartmann, U;Brierley, CJ;Beck, CM;Jimenez, R;Alnot, P;Durand, O;', '', '', '', '', '', 'Spatial and angle distribution of internal stresses in nano- and microstructured chemical vapor deposited diamond as revealed by Brillouin spectroscop', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The use of a new Brillouin spectroscopic technique evidences the existence of internal stresses in white plasma assisted chemical vapor deposited diamond and allows a first assessment concerning their magnitude. The evaluation of the internal stresses is based on the pressure coefficients related to the longitudinal and transverse elastic constants. (C) 2000 American Institute of Physics. [S0021- 8979(00)00801-X].', '', '', '', '', '', '', '', 10, 10, '', '', '', '0021-8979', '', '', '', 'JAN 1 2000', '2000', '87', '1', '', '', '', '74', '77', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(249, '', 'J', 'Kruger, JK;Embs, J;Brierley, J;Jimenez, R;', '', '', '', '', '', 'A new Brillouin scattering technique for the investigation of acoustic and opto-acoustic properties: application to polymers', 'JOURNAL OF PHYSICS D-APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Within this paper we propose a versatile Brillouin technique which allows an easy determination of acoustic and opto-acoustic properties of thin films. This new technique is especially suitable for studying acoustic dispersion behaviour at hypersonic frequencies. Typical applications in the field of polymers have been used to demonstrate the efficiency of the proposed scattering technique.', '', '', '', '', '', '', '', 46, 46, '', '', '', '0022-3727', '', '', '', 'AUG 7 1998', '1998', '31', '15', '', '', '', '1913', '1917', '', '10.1088/0022-3727/31/15/021', '', '', '', '', '', '', 'WOS:0', 0, 0),
(250, '', 'J', 'Kruger, JK;Jimenez, R;Bohn, KP;Fischer, C;', '', '', '', '', '', 'Phase-transition behavior of n-alkanes on nanostructured polytetrafluorethylene films: Brillouin spectroscopic and calorimetric investigations on pent', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'Large monocrystalline domains of pentacosane (C25H52) have been prepared on nanostructured polytetrafluoroethylene films. The acoustic and thermal properties have been investigated around the various phase transitions of the crystalline state of pentacosane using high-performance Brillouin spectroscopy and modulated differential scanning calorimetry. In the crystalline orthorhombic phase the values of the elastic constants are c(22)=7 GPa, c(33)=35 GPa, c(44)=2 GPa. In the R-V orthorhombic rotator phase the elastic constants are c(22)=3.35 GPa, c(33)=3.67 GPa, c(44)< 0.05 GPa. The evidenced thermal and acoustic anomalies are discussed in the frame of the accompanying structural changes.', '', '', '', '', '', '', '', 17, 17, '', '', '', '0163-1829', '', '', '', 'OCT 1 1997', '1997', '56', '14', '', '', '', '8683', '8690', '', '10.1103/PhysRevB.56.8683', '', '', '', '', '', '', 'WOS:A', 0, 0),
(251, '', 'J', 'Kruger, JK;Heydt, B;Fischer, C;Baller, J;Jimenez, R;Bohn, KP;Servet, B;Galtier, P;Pavel, M;Ploss, B;Beghi, M;Bottani, C;', '', '', '', '', '', 'Surface-induced organization of linear molecules on nanostructured polytetrafluoroethylene: Crystalline state of poly[vinylidenefluoride-trifluoroethy', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'Highly crystalline and uniaxial-oriented polytetrafluoroethylene films, nanostructured in one dimension, were used to produce a fully crystalline, thermoreversible morphology in the ferroelectric copolymer poly[vinylidenefluoride-trifluoroethylene]. The resulting state is built up of regularly stacked lamellar crystals of about 100 nm thickness and lateral dimensions of about 6 mu m.', '', '', '', '', '', '', '', 24, 24, '', '', '', '0163-1829', '', '', '', 'FEB 1 1997', '1997', '55', '6', '', '', '', '3497', '3506', '', '10.1103/PhysRevB.55.3497', '', '', '', '', '', '', 'WOS:A', 0, 0),
(252, '', 'J', 'Jimenez, R;Kruger, JK;Bohn, KP;Fischer, C;', '', '', '', '', '', 'Surface-induced organization of n-alkanes on nanostructured PTFE .1. Brillouin spectroscopic investigations on pentacosane', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'Taking advantage of the surface-induced orientation of linear molecules on highly oriented nanostructured polytetrafluoroethylene, we were able to grow macroscopic single crystals of C25H52 (pentacosane). Using high-performance Brillouin spectroscopy, we determined for the first time the complete elastic tensor of an n-alkane.', '', '', '', '', '', '', '', 11, 11, '', '', '', '0953-8984', '', '', '', 'OCT 7 1996', '1996', '8', '41', '', '', '', '7579', '7587', '', '10.1088/0953-8984/8/41/007', '', '', '', '', '', '', 'WOS:A', 0, 0),
(255, '', 'J', 'Jimenez Rioboo, RJ;Belmahi, M;', '', '', '', '', '', 'Brillouin spectroscopy and elastic properties of the nucleation and growth faces of synthetic diamond films', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The study of the surface elastic properties of chemical vapor deposited (CVD) diamond films by means of the high resolution Brillouin spectroscopy reveals a clear difference in the elastic response between the nucleation face and the growth face, the second one being elastically stiffer. This information is relevant for the technological application of CVD diamond films in surface acoustic wave devices. This fact also implies the existence of elastic gradients in the CVD grown films. (C) 2005 American Institute of Physics.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'APR 1 2005', '2005', '97', '7', '', '', '', '', '', '073509', '10.1063/1.1831550', '', '', '', '', '', '', 'WOS:0', 0, 0),
(300, '', 'J', 'Jiménez B; Jiménez R;', 'Jiménez B; Jiménez R;', '', '', '', '', 'Thermal expansion of Cr-doped TGS as a function of the DC electric field', 'FERROELECTRICS', '', '', '', '', '', '', '', '', '', '', 'Measurements have been made of thermal expansion in the direction of the b axis, in Cr-doped TGS crystals. Results show that the anomalous component of the thermal expansion coefficient varies linearly with (log(T-Tc))^1/3 in the interval 0.05ºC < T-Tc < 0.8ºC. The electric field produces a decrease of the slope of de Da vs.(log(T-Tc))^1/3 lines and a flattening of the transition peak.\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '', '', '', '', '', '1994', '154', '', '', '', '', '125', '130', '', '', '', '', '', '', '', '', '', 0, 0),
(301, '', 'J', 'GarciaHernandez, M;JimenezRioboo, RJ;Prieto, C;FuentesGallego, JJ;Blanco, E;RamirezdelSolar, M;', '', '', '', '', '', 'Brillouin spectroscopy on dried sonogels', 'APPLIED PHYSICS LETTERS', '', '', '', '', '', '', '', '', '', '', 'The elastic properties of organically modified silicates prepared by ultrasonics aided polycondensation of Tetraethoxysilane and Polidimethylsiloxane is studied by means of high resolution Brillouin spectroscopy. Our results evidence the microseparation of the organic and inorganic phases for the systems with high content of polymer. We propose a mechanical model that qualitatively explains the observed variation of the elastic constant c(11) vs molar fraction of dimethylsiloxane in these vitreous materials and develop a structural model that accounts for the observed dynamical behavior. (C) 1996 American Institute of Physics.', '', '', '', '', '', '', '', 4, 4, '', '', '', '0003-6951', '', '', '', 'DEC 16 199', '1996', '69', '25', '', '', '', '3827', '3829', '', '', '', '', '', '', '', '', 'WOS:A', 0, 0),
(257, '', 'J', 'Gutierrez-Lazaro, Carmen;Bretos, Inigo;Jimenez, Ricardo;Ricote, Jesus;El Hosiny, Hitham;Perez-Mezcua, Dulce;Jimenez Rioboo, Rafael J.;Garcia-Hernandez, Mar;Calzada, Maria L.;', '', '', '', '', '', 'Solution Synthesis of BiFeO3 Thin Films onto Silicon Substrates with Ferroelectric, Magnetic, and Optical Functionalities', 'JOURNAL OF THE AMERICAN CERAMIC SOCIETY', '', '', '', '', '', '', '', '', '', '', 'Single-BiFeO3 perovskite films onto Pt-coated silicon substrates have been fabricated by chemical solution deposition using a synthesis strategy based on the use of nonhazardous reagents. Different routes were tested to obtain precursors for the deposition of the films, inferring that bismuth (III) nitrate and iron (III) 2,4-pentanedionate dissolved in acetic acid and 1,3-propendiol led to the best solution. Ferroelectric, magnetic, and optical functionalities were demonstrated in these films, obtaining a high ferroelectric polarization at room temperature, 67Cxcm(-2), a dependence of the magnetization with the film thickness, 0.60 and 2.50emuxg(-1) for the 215 and 42-nm-thick films, and a direct band gap in the visible range, E-g 2.82eV. These results support the interest of solution methods for the fabrication of BiFeO3 thin films onto the silicon substrates required in microelectronic devices.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0002-7820; 1551-2916', '', '', '', 'OCT 2013', '2013', '96', '10', '', '', '', '3061', '3069', '', '10.1111/jace.12569', '', '', '', '', '', '', 'WOS:0', 1, 0),
(258, '', 'J', 'Perez-Castaneda, Tomas;Jimenez Rioboo, Rafael J.;Ramos, Miguel A.;', '', '', '', '', '', 'Low-temperature thermal properties of a hyperaged geological glass', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'We have measured the specific heat of amber from the Dominican Republic, an ancient geological glass about 20 million years old, in the low-temperature range 0.6 K <= T <= 26 K, in order to assess the effects of its natural stabilization (hyperageing) process on the low-temperature glassy properties, i.e. boson peak and two-level systems. We have also conducted modulated differential scanning calorimetry experiments to characterize the thermodynamic state of our samples. We found that calorimetric curves exhibit a huge ageing signal Delta H approximate to 5 J g(-1) in the first upscan at the glass transition T-g = 389 K, that completely disappears after heating up (rejuvenating) the sample to T = 395 K for 3 h. To independently evaluate the phonon contribution to the specific heat, Brillouin spectroscopy was performed in the temperature range 80 K <= T <= 300 K. An expected increase in the Debye level was observed after rejuvenating the Dominican amber. However, no significant change was observed in the low-temperature specific heat of glassy amber after erasing its thermal history: both its boson peak (i.e., the maximum in the C-p/T-3 representation) and the density of tunnelling two-level systems (i.e., the C-p similar to T contribution at the lowest temperatures) remained essentially the same. Also, a consistent analysis using the soft-potential model of our Cp data and earlier thermal-conductivity data found in the literature further supports our main conclusion, namely, that these glassy ''anomalous'' properties at low temperatures remain essentially invariant after strong relaxational processes such as hyperageing.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0953-8984', '', '', '', 'JUL 24 201', '2013', '25', '29', '', '', '', '', '', '295402', '10.1088/0953-8984/25/29/295402', '', '', '', '', '', '', 'WOS:0', 1, 0),
(259, '', 'J', 'Jimenez Rioboo, Rafael J.;Prieto, Carlos;Cusco, Ramon;Artus, Lluis;Boney, Chris;Bensaoula, Abdelhak;Yamaguchi, Tomohiro;Nanishi, Yasushi;', '', '', '', '', '', 'Temperature Dependence of Surface Acoustic Wave Propagation Velocity in InxGa1-xN Films Obtained by High-Resolution Brillouin Spectroscopy: Determinat', 'APPLIED PHYSICS EXPRESS', '', '', '', '', '', '', '', '', '', '', 'Temperature-dependent surface acoustic wave (SAW) propagation velocity and temperature coefficient of frequency (TCF) have been determined for the first time in InxGa1-xN alloys by means of high-resolution Brillouin spectroscopy (HRBS). HRBS offers an alternative way of determining TCF. The obtained TCF values present a non-linear behavior with the In concentration. TCF of pure InN (-13.75 ppm/K) is similar to those of AIN and GaN (-19 and -17.7 ppm/K, respectively). InxGa1-xN samples exhibit frequency values that are very stable against temperature changes, which makes InxGa1-xN a good candidate for current SAW-based technological applications. (C) 2013 The Japan Society of Applied Physics', '', '', '', '', '', '', '', 0, 0, '', '', '', '1882-0778', '', '', '', 'MAY 2013', '2013', '6', '5', '', '', '', '', '', '056601', '10.7567/APEX.6.056601', '', '', '', '', '', '', 'WOS:0', 1, 0),
(260, '', 'J', 'Philipp, Martine;Mueller, Ulrich;Jimenez Rioboo, Rafael J.;Sanctuary, Roland;Mueller-Buschbaum, Peter;Krueger, Jan K.;', '', '', '', '', '', 'Kinetic processes at the demixing transition of PNIPAM solutions', 'SOFT MATTER', '', '', '', '', '', '', '', '', '', '', 'Kinetic processes, which are joined with mass transport, are studied in the vicinity of the sharp LCST-type demixing transition of semi-dilute aqueous poly(N-isopropyl acrylamide) (PNIPAM) solutions. These processes are slow as compared to the highly cooperative collapse of individual polymer chains. Purely elastic properties, that are particularly sensitive to this phase transition, are addressed depending on the temperature, space and time by Brillouin spectroscopy. Above the demixing temperature T-c, we discriminate between kinetics related to the phase separation into PNIPAM-rich and PNIPAM-poor domains and kinetics connected to the impact of gravitation on the on-going phase separation. Using shallow temperature jumps of 0.3 degrees C, the growth of compact PNIPAM-rich agglomerates with identical gel-like mechanical consistency is provoked independently of temperature and position within the sample above T-c. Astonishingly, the transition temperature does not vary while heating or cooling the solutions across the phase transition, although the elastic properties depend strongly on space and time during the equilibration of PNIPAM concentration gradients following the re-entrance into the low-temperature phase.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1744-683X', '', '', '', '2013', '2013', '9', '41', '', '', '', '9887', '9896', '', '10.1039/c3sm51333e', '', '', '', '', '', '', 'WOS:0', 1, 0),
(261, '', 'J', 'Jimenez Rioboo, R. J.;De Andres, A.;Kubacka, A.;Fernandez-Garcia, M.;Cerrada, M. L.;Serrano, C.;Fernandez-Garcia, M.;', '', '', '', '', '', 'Influence of nanoparticles on elastic and optical properties of a polymeric matrix: Hypersonic studies on ethylene-vinyl alcohol copolymer-titania nan', 'EUROPEAN POLYMER JOURNAL', '', '', '', '', '', '', '', '', '', '', 'High resolution Brillouin spectroscopy (HRBS) backscattering elastic data in nanocomposites of ethylene-vinyl alcohol copolymer (EVOH) and TiO(2) nanoparticles present anomalous dependence with concentration, while Young''s modulus and microhardness data show the expected behaviour. When performing HRBS with the 90A scattering geometry to asses the effective elastic constant, the expected behaviour for low concentration of TiO(2) nanoparticles is again obtained. This unusual disagreement can be solved assuming that the inclusion of TiO(2) nanoparticles induces anomalous refractive index behaviour at the applied laser wavelength for the different EVOH-TiO(2) nanocomposites. Comparison with experimental elastic and optical data obtained in isotactic-polypropylene-TiO(2) nanocomposites proves that EVOH-TiO(2) nanocomposites show an unusual optical behaviour at the laser wavelength, possibly due to a singular bonding between the EVOH polymer and the TiO(2) nanoparticles. (C) 2009 Elsevier Ltd. All rights reserved.', '', '', '', '', '', '', '', 4, 4, '', '', '', '0014-3057', '', '', '', 'MAR 2010', '2010', '46', '3', '', '', '', '397', '403', '', '10.1016/j.eurpolymj.2009.11.009', '', '', '', '', '', '', 'WOS:0', 1, 0),
(262, '', 'J', 'Salas, E.;Jimenez Rioboo, R. J.;Munoz-Martin, A.;Prieto, C.;', '', '', '', 'IOP', '', 'Influence of the Preparation Temperature on the SAW Velocity of Partially Oxidized Fe Thin Films', 'INNOVATIONS IN THIN FILM PROCESSING AND CHARACTERISATION (ITFPC 2009)', 'IOP Conference Series-Materials Science and Engineering', '', '', '', '4th International Conference on Innovation in Thin Film Processing and Characterization (ITFPC)', 'NOV 17-20,', 'Nancy, FRANCE', 'French Vacuum Soc; Inst Jean Lamour', '', '', 'The influence of the preparation temperature on the surface acoustic wave (SAW) propagation velocity of iron thin films deposited by DC magnetron sputtering has been studied by High Resolution Brillouin Spectroscopy (HRBS). A clear different elastic behaviour has been found for sample grown at 200 K substrate temperature. Numerical simulation has been used to reproduce experimental elastic data and it is possible to relate the difference in elastic response in different samples to the existence of a FeO layer among other oxides. This effect is discussed in relation with the iron oxidation type that also affects the magnetic properties of iron thin films on silicon substrates.', '', '', '', '', '', '', '', 1, 1, '', '', '', '1757-8981', '', '', '', '2010', '2010', '12', '', '', '', '', '', '', '012014', '10.1088/1757-899X/12/1/012014', '', '', '', '', '', '', 'WOS:0', 1, 0),
(263, '', 'J', 'Jimenez Rioboo, R. J.;Kabtoul, B.;Ramos, M. A.;', '', '', '', '', '', 'Crystalline phase transitions and acoustic phonons behaviour of polymorphic ethanol', 'EUROPEAN PHYSICAL JOURNAL B', '', '', '', '', '', '', '', '', '', '', 'Ethanol shows a complex scenario of different crystalline phases in the temperature range between its glass transition at T(g) = 97 K and its melting point at T(m) = 159 K. Brillouin spectroscopy has revealed capable of observing and assessing acoustic phonon changes related to these phase transitions between different crystalline phases (either a plastic-crystal phase or different monoclinic phases). By combining this technique and calorimetric experimental data, we are able to corroborate the existence of at least two stable and two metastable (monoclinic) crystalline phases of pure ethanol.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1434-6028', '', '', '', 'SEP 2009', '2009', '71', '1', '', '', '', '41', '45', '', '10.1140/epjb/e2009-00271-7', '', '', '', '', '', '', 'WOS:0', 0, 0),
(264, '', 'J', 'Jimenez Rioboo, R. J.;Philipp, M.;Ramos, M. A.;Krueger, J. K.;', '', '', '', '', '', 'Concentration and temperature dependence of the refractive index of ethanol-water mixtures: Influence of intermolecular interactions', 'EUROPEAN PHYSICAL JOURNAL E', '', '', '', '', '', '', '', '', '', '', 'The temperature and concentration dependence of the refractive index, n (D)(x, T) , in ethanol-water mixtures agrees with previous data in the ethanol-rich concentration range. The refractive index versus concentration x determined at 20 (A degrees) C shows the expected maximum at about 41 mol% water (22 mass% water). The temperature derivative of the refractive index, dn (D) /dT, shows anomalies at lower water concentrations at about 10 mol% water but no anomaly at 41 mol% water. Both anomalies are related to intermolecular interactions, the one in n(D) seems to be due to molecular segregation and cluster formation while the origin of the second one in dn (D) /dT is still not clear.', '', '', '', '', '', '', '', 15, 15, '', '', '', '1292-8941', '', '', '', 'SEP 2009', '2009', '30', '1', '', '', '', '19', '26', '', '10.1140/epje/i2009-10496-4', '', '', '', '', '', '', 'WOS:0', 0, 0),
(265, '', 'J', 'Beaudry, J.-N.;Shtinkov, N.;Masut, R. A.;Desjardins, P.;Jimenez Rioboo, R. J.;', '', '', '', '', '', 'Compositional dependence of the elastic constants of dilute GaAs1-xNx alloys', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'High-resolution Brillouin spectroscopy experiments were carried out to determine the velocity of surface acoustic waves (SAW) as a function of composition in GaAs1-xNx/GaAs(100) epilayers (0 < x < 0.037) grown by organometallic vapor phase epitaxy. Experimental data were analyzed using simulations of surface acoustic wave velocities. For all compositions investigated, SAW velocity measurements in both the [100] and [110] crystallographic directions are in close agreement with values predicted assuming linearly interpolated elastic constants between those of GaAs and GaN. (c) 2007 American Institute of Physics.', '', '', '', '', '', '', '', 2, 2, '', '', '', '0021-8979', '', '', '', 'JUN 1 2007', '2007', '101', '11', '', '', '', '', '', '113507', '10.1063/1.2736340', '', '', '', '', '', '', 'WOS:0', 0, 0),
(266, '', 'J', 'Assouar, M. B.;Rioboo, R. J. Jimenez;Elmazria, O.;Vila, M.;', '', '', '', '', '', 'Study of effect of deposition temperature of AIN films on SAW velocity using Brillouin spectroscopy', 'DIAMOND AND RELATED MATERIALS', '', '', '', '', '17th European Conference on Diamond, Diamond-Like Materials, Carbon Nanotubes, Nitrides and Silicon ', 'SEP 03-08,', 'Estoril, PORTUGAL', 'AIXTRON AG; Elsevier Ltd; Iplas Innovat Plasma Syst GmbH; Lambda Technologies; Seki Technotron Corp', '', '', 'The study of the effect of the deposition temperature on the surface acoustic wave (SAW) propagation velocity of aluminum nitride (AIN) films has been made using Brillouin spectroscopy. The AIN films were deposited using magnetron sputtering technique. Acoustical and structural characterizations of the thin films were made to point out the effect of deposition temperature on acoustical properties. The results show a clear dependence of the SAW propagation velocity on the growth temperature of AN films. The highest value of acoustic velocity was obtained for the film elaborated without heating. Structural characterization of the AN films obtained at various deposition temperatures was carried out by X-ray diffraction. These analyses pointed out that the deposition temperature influences the standard deviation of (002) AIN film preferred orientation. The growth temperature clearly influences the acoustical and crystalline properties of AIN thin films. The AIN film obtained at lower deposition temperature presents the higher SAW velocity which we have determined by achievement of SAW device based on this AIN film. (C) 2006 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0925-9635', '', '', '', 'APR-JUL 20', '2007', '16', '4-7', '', '', '', '1417', '1420', '', '10.1016/j.diamond.2006.12.012', '', '', '', '', '', '', 'WOS:0', 0, 0),
(267, '', 'J', 'Jimenez Rioboo, R. J.;Ramos, M. A.;', '', '', '', '', '', 'Brillouin spectroscopy experiments on polymorphic ethanol', 'PHILOSOPHICAL MAGAZINE', '', '', '', '', '10th International Workshop on Disordered Systems Moveno-Andalo', 'MAR 18-21,', 'Trento, ITALY', 'Univ Trento, Dipartimento Fis; DYGLAGEMEM European Network; INFM-CNR; Res Ctr SOFT', '', '', 'We report Brillouin Spectroscopy experiments conducted on ethanol in the liquid and glass states, as well as in the stable crystal, plastic crystal and orientationally-disordered crystal crystal") phases. Both the canonical Supercooled liquid <-> glass transition and the dynamical plastic crystal ( glassy crystal transition are observed as a kink in the Sound velocity at 96K. We have also studied the influence Of small amounts of water on the crystallization kinetics for the stable and the plastic crystal phases, which are slowed down in favour of glass formation even with less than 0.5%, Water impurity.', '', '', '', '', '', '', '', 2, 2, '', '', '', '1478-6435', '', '', '', 'JAN-FEB 20', '2007', '87', '3-5', 'SI', '', '', '657', '663', '', '10.1080/14786430600909048', '', '', '', '', '', '', 'WOS:0', 0, 0),
(268, '', 'J', 'Assouar, MB;Rioboo, RJJ;Vila, M;Alnot, P;', '', '', '', '', '', 'Effect of deposition temperature on surface acoustic wave velocity of aluminum nitride films determined by Brillouin spectroscopy', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Brillouin spectroscopy has been used to study the effect of the deposition temperature on the surface acoustic wave (SAW) propagation velocity of aluminum nitride (AlN) films. The results show a dependence of the SAW propagation velocity on the growth temperature of AlN films. The highest value of acoustic velocity was obtained for the film elaborated without heating. Structural characterization of the AlN films synthesized at various deposition temperatures was carried out by x-ray diffraction. These analyses pointed out that the deposition temperature influences the standard deviation of (002) AlN film preferred orientation. The growth temperature clearly influences the acoustical and crystalline properties of AlN thin films. (c) 2005 American Institute of Physics.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0021-8979', '', '', '', 'NOV 1 2005', '2005', '98', '9', '', '', '', '', '', '096102', '10.1063/1.2121927', '', '', '', '', '', '', 'WOS:0', 0, 0),
(269, '', 'J', 'Bretos, I;Ricote, J;Jimenez, R;Mendiola, J;Rioboo, RJJ;Calzada, ML;', '', '', '', '', '', 'Crystallisation of Pb1-xCaTiO3 ferroelectric thin films as a function of the Ca2+ content', 'JOURNAL OF THE EUROPEAN CERAMIC SOCIETY', '', '', '', '', '9th Electroceramics Congress', 'MAY 31-JUN', 'Cherbourg, FRANCE', 'European Ceram Soc; Amer Ceram Soc; Ceram Soc Japan; Korean Ceram Soc; POLECER', '', '', 'Lead calcium titanate (Pb1-xCaxTiO3) thin films with x from 0 to 0.50 were prepared by chemical solution deposition. Crystallinity of the films was studied as a function of calcium content and processing temperature. These studies were carried Out on films deposited onto oxidised (1 0 0) Si substrates by means of X-ray diffraction. The analysis seems to indicate that the grain size of the films decreases as Ca2+ content increases, which was confirmed from the scanning force microscopy images of the films. X-ray data reveal that kinetics of grain growth in films with Ca2+ contents over 40 at% is very slow. Increase of calcium also produces a decrease in tetragonality of the perovskite films. Besides, it was observed that reflections of the perovskite appear at higher temperature in the films with larger Ca2+ contents. Brillouin spectroscopy was used to follow the evolution of the elastic properties of the films with temperature. This study shows an elastic instability at temperatures between 475 degrees C and 500 degrees C that can be associated to complete film crystallisation. Dielectric and ferroelectric properties were measured on films deposited onto platinised silicon substrates and crystallised at 650 degrees C. The films with 50 at% of Ca2+ still have ferroelectric properties, showing diffuse ferro-paraelectric transitions and slim ferroelectric hysteresis loops. (c) 2005 Elsevier Ltd. All rights reserved.', '', '', '', '', '', '', '', 18, 18, '', '', '', '0955-2219', '', '', '', '2005', '2005', '25', '12', '', '', '', '2325', '2329', '', '10.1016/j.jeurceramsoc.2005.03.051', '', '', '', '', '', '', 'WOS:0', 0, 0),
(270, '', 'J', 'Pedros, J;Calle, F;Grajal, J;Rioboo, RJJ;Prieto, C;Pau, JL;Pereiro, J;Hermann, M;Eickhoff, M;Bougrioua, Z;', '', '', '', '', '', 'Anisotropic propagation of surface acoustic waves on nitride layers', 'SUPERLATTICES AND MICROSTRUCTURES', '', '', '', '', 'Spring Meeting of the European-Materials-Research-Society', 'MAY 24-28,', 'Strasbourg, FRANCE', 'European Mat Res Soc', '', '', 'The anisotropic propagation of surface acoustic modes in GaN and AlN induced by the c-sapphire substrate is presented. In the GaN case, the slow acoustic propagation velocity of GaN compared with sapphire leads to guided modes in the overlayer, which propagate at higher velocities but are more attenuated than the Rayleigh mode. Above the transonic state, pseudo-SAW modes are observed, some of them with low insertion losses. In contrast, only the Rayleigh mode is observed in AlN filters due to its higher acoustic propagation velocity with respect to sapphire. The difference in the crystal structure of the sapphire and the nitrides induces a dependence of the sound velocity of all the modes, and hence their frequency, on the propagation direction. The simulations show very good agreement with the experimental data for both nitride/sapphire structures when the anisotropy induced by the substrate is taken into account. (C) 2004 Elsevier Ltd. All rights reserved.', '', '', '', '', '', '', '', 3, 3, '', '', '', '0749-6036', '', '', '', 'OCT-DEC 20', '2004', '36', '4-6', '', '', '', '815', '823', '', '10.1016/j.spmi.2004.09.044', '', '', '', '', '', '', 'WOS:0', 0, 0),
(271, '', 'J', 'Rioboo, RJJ;Rodriguez-Canas, E;Vila, M;Prieto, C;Calle, F;Palacios, T;Sanchez, MA;Omnes, F;Ambacher, O;Assouar, B;Elmazria, O;', '', '', '', '', '', 'Hypersonic characterization of sound propagation velocity in AlxGa1-xN thin films', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Sound propagation velocity of surface acoustic waves (SAWs) and bulk acoustic waves (BAWs) has been investigated by means of high resolution Brillouin spectroscopy. The results show a linear dependence of the BAW propagation velocity with the Al concentration. There is no relevant influence of the substrate chosen in the propagation velocity of BAWs in AlxGa1-xN thin films. SAW propagation velocity of epitaxially grown AlN is clearly lower than the observed one in AlN prepared by reactive dc magnetron sputtering. Numerical simulation results of SAW propagation velocity are compared with the experimental results. (C) 2002 American Institute of Physics.', '', '', '', '', '', '', '', 19, 19, '', '', '', '0021-8979', '', '', '', 'DEC 1 2002', '2002', '92', '11', '', '', '', '6868', '6874', '', '10.1063/1.1517728', '', '', '', '', '', '', 'WOS:0', 0, 0),
(272, '', 'J', 'Rioboo, RJJ;Rodriguez-Canas, E;Prieto, C;', '', '', '', '', '', 'High resolution Brillouin spectroscopy and determination of elastic properties of ferroelectric and piezoelectric films', 'FERROELECTRICS', '', '', '', '', '10th International Meeting on Ferroelectricity (IMF-10)', 'SEP 03-07,', 'MADRID, SPAIN', '', '', '', 'High resolution Brillouin spectroscopy has been used in a new way to study the influence of different substrates on the elastic properties of Al(x)Ga(1-x)N piezoelectric films (about 1 mum thickness). These films are interesting for their versatile applications in different fields as is the case of SAW based filters and UV detectors. Films of oriented PVDF/TrFE deposited on Si substrates have been also subject of investigation. This semi-crystalline polymer material is a well known ferroelectric and the quality of its ferroelectric properties depends on the degree of orientation. The elastic constants are very sensitive probes for structural changes, which are of fundamental importance to understand the mechanism of the ferroelectric properties degradation and so for the technological applications of these films.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0015-0193', '', '', '', '2002', '2002', '272', '', '', '', '', '2085', '2090', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(273, '', 'J', 'Rioboo, RJJ;Calzada, ML;Kruger, JK;Alnot, P;', '', '', '', '', '', 'Elastic properties by Brillouin spectroscopy of sol-gel (Pb,Ca)TiO3 films', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'A direct evaluation of elastic properties and refractive indices of sol-gel derived calcium modified lead titanate films has been made by means of Brillouin spectroscopy using a new experimental configuration. Amorphous films deposited on platinized substrates were treated at temperatures between 350 and 650 degrees C, using rapid thermal annealing. A variation of the sound velocity in the films with the annealing temperature was measured. A clear decrease at 375 degrees C and a continuous softening of the sound velocity up to 475 degrees C were observed. The latter is followed by a jump toward higher values of the sound velocity when the samples are treated at higher temperatures. Grazing incidence x-ray diffraction and profilemetry have been used to monitor structural changes and variation of film thickness with temperature, inferring relations among these parameters and properties obtained from the Brillouin measurements. (C) 1999 American Institute of Physics. [S0021-8979(99)06610-4].', '', '', '', '', '', '', '', 6, 6, '', '', '', '0021-8979', '', '', '', 'MAY 15 199', '1999', '85', '10', '', '', '', '7349', '7354', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(274, '', 'J', 'Rioboo, RJJ;Souto, J;de Saja, JA;Prieto, C;', '', '', '', '', '', 'Elastic properties of Langmuir-Blodgett films. A new Brillouin spectroscopic strategy', 'LANGMUIR', '', '', '', '', '', '', '', '', '', '', 'A new Brillouin spectroscopic strategy has permitted us, for the first time, to obtain direct information about the values of the longitudinal elastic constant in the growth plane and in the growth direction (c(11) and c(33), respectively) of a Langmuir-Blodgett film of copper arachidate. The obtained results show the elastic isotropy of the film in the growth plane and the clear difference from the value obtained in directions almost parallel to the growth direction (c(11) = 9.4 +/- 0.1 GPa and c(33) > 10.59 GPa). This nondestructive and contactless method opens new perspectives in the determination of the elastic properties of thin film samples.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0743-7463', '', '', '', 'NOV 10 199', '1998', '14', '23', '', '', '', '6625', '6627', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(275, '', 'J', 'Rioboo, RJJ;Garcia-Hernandez, M;Prieto, C;Lorenzo, JE;Regnault, LP;', '', '', '', '', '', 'Anomalous hypersonic behavior of CuGeO3 prior to the spin-Peierls transition', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'The temperature dependence of the longitudinal elastic constants c(22), c(33), and of the transverse elastic constant c(44), as obtained by Brillouin spectroscopy, reveals an unexpected elastic behavior in CuGeO3 prior to the spin-Peierls magnetic transition (T(SP)approximate to 14 1 K) At room temperature c(33)much greater than c(44)>c(22). Below about 50 K a steep increase in the values of the longitudinal elastic constants leads to a crossover of the values of c(22) and c(44) with c(22)>c(44). The existence of translation-rotation coupling in CuGeO3 could account for the elastic behavior above T-SP. The anisotropy of the magnetoelastic coupling at the spin-Peierls transition temperature is reflected in the different temperature behavior of the elastic constants (c(33), c(44), and c(22)) at T(SP)approximate to 14.1 K.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0163-1829', '', '', '', 'OCT 1 1998', '1998', '58', '13', '', '', '', '8574', '8578', '', '10.1103/PhysRevB.58.8574', '', '', '', '', '', '', 'WOS:0', 0, 0),
(278, '', 'J', 'Jimenez, B;Duran-Martin, P;Jimenez-Rioboo, RJ;Jimenez, R;', '', '', '', '', '', 'On the existence of a second phase transition in ferroelectrics with Aurivillius-type structure through the study of the Young''s modulus', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'The possible existence of a second phase transition in Aurivillius-structure-type ferroelectric compounds is discussed. For this purpose, measurements of the complex elastic (Young''s) modulus, dielectric constant, DC conductivity and Raman spectra as a function of temperature have been performed. The results suggest that the anomalies that appear in macroscopic complex elastic modulus, DC conductivity and, probably, those of the 25 cm(-1) vibration mode of Raman spectra near the temperature of 300 degrees C do not correspond to a ferro-paraelectric or ferro-ferroelectric phase transition. Anomalies in the dielectric constant have only been found at the phase transition temperatures. Brillouin measurements show that the 300 degrees C anomaly is of extrinsic character, which could be connected to shallow point defects caused by the Bi3+ instability in the Bi2O2 layer. With increasing temperature, the defects are ionized increasing the DC conductivity and changing the elastic properties of the material by pinning domain walls or dislocations. Electron spin resonance (ESR) spectra, obtained after heating the samples at T = 500 degrees C, show the line of the almost free electron from the ionized defects.', '', '', '', '', '', '', '', 14, 14, '', '', '', '0953-8984', '', '', '', 'APR 17 200', '2000', '12', '16', '', '', '', '3883', '3895', '', '10.1088/0953-8984/12/16/310', '', '', '', '', '', '', 'WOS:0', 0, 0),
(279, '', 'J', 'Jimenez, B;Duran-Martin, P;Jimenez-Rioboo, R;Jimenez, R;', '', '', '', '', '', 'Thermal behavior of the elastic (Young''s) modulus in SBN-derived compounds (Bi2SrNb2O9)', 'JOURNAL OF THE EUROPEAN CERAMIC SOCIETY', '', '', '', '', 'ELECTROCERAMICS VI 98', 'AUG 24-27,', 'MONTREUX, SWITZERLAND', 'Swiss Fed Inst Technol Lausanne; Japanese Fdn Promot Mat Sci', '', '', 'Measurements of the elastic (Young''s) modulus, mechanical losses and d.c. electrical conductivity as a function of the temperature in Aurivillius type structure ferroelectric ceramics have been performed. The results suggest that the anomalies appearing in macroscopic complex elastic modulus and electrical conductivity near the temperature of 300 degrees C, do not correspond to a ferro- paraelectric or ferro-ferroelectric phase transition. These anomalies could be caused by a change in the defect structure coming from unstable Bi3+ cation. (C) 1999 Elsevier Science Limited. All rights reserved.', '', '', '', '', '', '', '', 3, 3, '', '', '', '0955-2219', '', '', '', '1999', '1999', '19', '6-7', '', '', '', '1315', '1319', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(280, '', 'J', 'Blanco, E;Garcia-Hernandez, M;Jimenez-Rioboo, R;Litran, R;Prieto, C;Ramirez-Del-Solar, M;', '', '', '', '', '', 'Microstructural and mechanical properties of sono-ormosils', 'JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY', '', '', '', '', '', '', '', '', '', '', 'Monolithic pieces and films of ormosils were obtained from ultrasound-assisted polycondensation of tetraethoxysilane (TEOS) and polydimethylsiloxane (PDMS). These sono-ormosils were studied by means of high resolution Brillouin spectroscopy and their textures analyzed from adsorption isotherms. Evidence is given for the occurrence of organic and inorganic micro-phase separation in samples with high polymer concentrations. Nitrogen isotherms show that the texture of the samples is highly dependent on the composition.', '', '', '', '', '', '', '', 2, 2, '', '', '', '0928-0707', '', '', '', '1998', '1998', '13', '1-3', '', '', '', '451', '455', '', '10.1023/A:1008681513651', '', '', '', '', '', '', 'WOS:0', 0, 0),
(281, '', 'J', 'Jimenez, R.;Hungria, T.;Castro, A.;Jimenez-Rioboo, R.;', '', '', '', '', '', 'Phase transitions in Na(1-x)Li(x)NbO(3) solid solution ceramics studied by a new pyroelectric current based method', 'JOURNAL OF PHYSICS D-APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The pyroelectric current response is one of the most important features of ferro-piezoelectric materials. The polarization versus temperature curve is the main signature of the phase transitions in these materials. The integration of the thermally stimulated current (TSC) released by polarized samples on increasing T has been used to reproduce the polarization versus temperature behaviour. However, in the TSC current there are contributions coming from sample conductivity, released charges and ferroelectric relaxation, among others, that become more important for high T(c) ferroelectrics. In this work a new approach of analysis of the TSC current is proposed to extract the ''true'' pyroelectric current arising from the fluctuations of the temperature gradient applied to the sample. This new analysis is first tested with a well-known PZT ceramic and then applied to the study of phase stability and transitions in lead-free ferro-piezoelectric (Na(1-x)Li(x)) NbO(3) solid solution ceramics with 0 < x <= 0.12. Special emphasis is laid on the ferroelectric phase stabilization for the x = 0.5 sample.', '', '', '', '', '', '', '', 5, 5, '', '', '', '0022-3727', '', '', '', 'MAR 21 200', '2008', '41', '6', '', '', '', '', '', '065408', '10.1088/0022-3727/41/6/065408', '', '', '', '', '', '', 'WOS:0', 0, 0),
(282, '', 'J', 'Bretos, I.;Ricote, J.;Jimenez-Rioboo, R. J.;Pardo, L.;Calzada, M. L.;', '', '', '', '', '', 'Elastic instability of the nano-structured state as an intrinsic probe to study the early formation stages of sol-gel derived (Pb1-xCax)TiO3 thin film', 'APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING', '', '', '', '', '', '', '', '', '', '', 'A novel method to investigate the early formation stages of polycrystalline (Pb1-xCax)TiO3 (PCT) perovskite films by means of traditional Brillouin and micro-Brillouin spectroscopy (BS, mBS) is described in the present work. The films were prepared by chemical solution deposition (CSD) onto oxidized (100)Si substrates and treated at temperatures between 350-650 degrees C by rapid thermal processing (RTP). The elastic instability observed by Brillouin spectroscopy at the nano-structured state of the PCT films was used here to determine their crystallization temperatures. Coexistence of different nanocrystalline phases (e.g., pyrochlore, perovskite) in the films could also be detected by this technique. The reliability of these results is demonstrated by complementary information obtained by X-ray diffraction (XRD) and scanning force microscopy (SFM). The effects of the annealing temperature and of the Ca2+ content on the crystallization process of these films are also discussed.', '', '', '', '', '', '', '', 4, 4, '', '', '', '0947-8396', '', '', '', 'DEC 2007', '2007', '89', '4', '', '', '', '967', '973', '', '10.1007/s00339-007-4179-2', '', '', '', '', '', '', 'WOS:0', 0, 0),
(283, '', 'J', 'Ramos, M. A.;Rodriguez-Mora, V.;Jimenez-Rioboo, R. J.;', '', '', '', '', '', 'Calorimetric and acoustic experiments on orientationally disordered and fully ordered crystalline phases of ethanol', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '4th Workshop on Nonequilibrium Phenomena in Supercooled Fluids, Glasses and Amorphous Materials', 'SEP 17-22,', 'Pisa, ITALY', 'Univ Pisa; Scuola Normale Superiore', '', '', 'Ethanol exhibits a very interesting polymorphism, presenting different solid phases below its melting point at 159 K: a structural ( amorphous) glass, by quenching the supercooled liquid below the glass-transition temperature T-g = 97 K; a (bcc) plastic crystal, which by quenching below the same Tg = 97 K becomes an orientationally disordered crystal with glassy properties (sometimes named a ''glassy crystal''); and fully ordered (monoclinic) crystals. We present here new calorimetric experiments and specific-heat measurements of the different phases of ethanol in the relevant temperature range around the glass- transition and melting temperatures. In addition, we have concurrently performed Brillouin-scattering experiments on these crystalline phases, both fully ordered and orientationally disordered ones, that complement our earlier studies of the glass phases. The possible role of water impurities in kinetic and thermodynamic properties has also been investigated.', '', '', '', '', '', '', '', 7, 7, '', '', '', '0953-8984', '', '', '', 'MAY 23 200', '2007', '19', '20', '', '', '', '', '', '205135', '10.1088/0953-8984/19/20/205135', '', '', '', '', '', '', 'WOS:0', 0, 0),
(284, '', 'J', 'Ramos, M. A.;Shmyt''ko, I. M.;Arnautova, E. A.;Jimenez-Rioboo, R. J.;Rodriguez-Mora, V.;Vieira, S.;Capitan, M. J.;', '', '', '', '', '', 'On the phase diagram of polymorphic ethanol: Thermodynamic and structural studies', 'JOURNAL OF NON-CRYSTALLINE SOLIDS', '', '', '', '', '5th International Discussion Meeting on Relaxations in Complex Systems', 'JUL 07-13,', 'Univ Sci & Technologies, Lille, FRANCE', '', '', '', 'It is well known that ethanol exhibits a very interesting polymorphism presenting different solid phases: a fully-ordered (monoclinic) crystal, a (bcc) plastic crystal, which by quenching becomes an orientationally-disordered crystal with glassy properties (hence sometimes named ''glass crystal''), and the ordinary amorphous glass. We have carried out calorimetric, X-ray diffraction, and Brillouin-scattering experiments above liquid-nitrogen temperatures and have found several new features that shed more light on the rich and interesting phase diagram of ethanol. firstly, we have identified up to four different varieties of the monoclinic crystalline phase depending on the thermal history. We also present new specific-heat data of these glassy and crystalline phases below the glass transition temperature up to the melting temperature. Furthermore, we have unexpectedly found that the amorphous phase can also be obtained by the unusual route of a very slow cooling of the liquid in some particular experimental set-ups, evidencing the heterogeneous character of the crystallization kinetics of these molecular glass-formers. (c) 2006 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 27, 27, '', '', '', '0022-3093', '', '', '', 'NOV 15 200', '2006', '352', '42-49', 'SI', '', '', '4769', '4775', '', '10.1016/j.jnoncrysol.2006.02.143', '', '', '', '', '', '', 'WOS:0', 0, 0);
INSERT INTO `papers` (`Id`, `VR`, `PT`, `AU`, `AF`, `BA`, `CA`, `GP`, `BE`, `TI`, `SO`, `SE`, `BS`, `LA`, `DT`, `CT`, `CY`, `CL`, `SP`, `HO`, `DE`, `AB`, `C1`, `RP`, `EM`, `FU`, `FX`, `CR`, `NR`, `TC`, `Z9`, `PU`, `PI`, `PA`, `SN`, `BN`, `J9`, `JI`, `PD`, `PY`, `VL`, `IS`, `SI`, `PN`, `SU`, `BP`, `EP`, `AR`, `DI`, `D2`, `PG`, `P2`, `WC`, `SC`, `GA`, `UT`, `SG`, `OS`) VALUES
(285, '', 'J', 'Pedros, J;Calle, F;Grajal, J;Jimenez Rioboo, RJ;Takagaki, Y;Ploog, KH;Bougrioua, Z;', '', '', '', '', '', 'Anisotropy-induced polarization mixture of surface acoustic waves in GaN/c-sapphire heterostructures', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'The characteristics of surface acoustic waves (SAWs) in GaN layers grown on c-plane sapphire are investigated. Besides Rayleigh mode, Sezawa and Love modes, which are confined in the nitride layers, arise because of the slow sound propagation in GaN compared with the substrate. In addition, pseudo-SAWs leaking into the bulk are observed. The trigonal crystal symmetry of sapphire not only leads to an anisotropic propagation of the SAWs in the heterostructures, despite the isotropic elastic properties in the c-plane GaN, but also mixes their polarization even for the propagation along high-crystal-symmetry directions. Love modes, which are normally piezoelectrically inactive, can be excited by interdigital transducers through this polarization mixture. The nonzero value of the elastic coefficient c(14) of sapphire is indicated to be the origin of the coupling of sagittal and shear horizontal displacements.', '', '', '', '', '', '', '', 11, 11, '', '', '', '1098-0121', '', '', '', 'AUG 2005', '2005', '72', '7', '', '', '', '', '', '075306', '10.1103/PhysRevB.72.075306', '', '', '', '', '', '', 'WOS:0', 0, 0),
(286, '', 'J', 'Krivchikov, Alexander I.;Hassaine, Merzak;Sharapova, Irina V.;Korolyuk, Oksana A.;Jimenez-Rioboo, Rafael J.;Ramos, Miguel A.;', '', '', '', '', '', 'Low-temperature properties of glassy and crystalline states of n-butanol', 'JOURNAL OF NON-CRYSTALLINE SOLIDS', '', '', '', '', '', '', '', '', '', '', 'We present low-temperature measurements of the specific heat and the thermal conductivity for the three solid phases of n-butanol, namely glass, crystal and "glacial" phases. Whereas crystal and glass ones are found to exhibit the expected thermal behavior for crystalline and non-crystalline solids, respectively (i.e. Debye theory for crystals, and universal low-temperature properties with a boson peak and a concomitant plateau in the thermal conductivity for glasses), the so-called "glacial phase" behaves as a very defective crystal, confirming earlier work that identifies it as a mixed phase of nanocrystallites and a disordered matrix. We have also measured longitudinal and transverse sound velocities at low temperatures for the glass phase. The elastic Debye coefficient and Debye temperature of the glass determined from these measurements are found to agree very well with the calorimetric ones obtained from a SPM analysis of the specific heat. (C) 2010 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 8, 8, '', '', '', '0022-3093', '', '', '', 'JAN 15 201', '2011', '357', '2', 'SI', '', '', '524', '529', '', '10.1016/j.jnoncrysol.2010.05.081', '', '', '', '', '', '', 'WOS:0', 1, 0),
(287, '', 'J', 'Shmyt''ko, I. M.;Jimenez-Rioboo, R. J.;Hassaine, M.;Ramos, M. A.;', '', '', '', '', '', 'Structural and thermodynamic studies of n-butanol', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'We have conducted x-ray diffraction, calorimetric and Brillouin-scattering experiments on n-butanol between 77 and 300 K, aiming to explore the physical nature of the so-called ''glacial state'' previously found in n-butanol as well as in triphenyl phosphite. In addition to our structural and thermodynamic studies of the liquid-glass transition and of the stable crystal state in n-butanol, we have found that the metastable ''glacial state'' that can be obtained in the temperature range 125-160 K is not a second amorphous state, but rather the result of a frustrated or aborted crystallization process that produces plenty of nanocrystallites embedded in a disordered matrix. The crystalline order of these nanocrystallites of the ''glacial phase'' is exactly the same as that well observed in the fully ordered stable crystal into which it transforms by heating above 160 K.', '', '', '', '', '', '', '', 17, 17, '', '', '', '0953-8984', '', '', '', 'MAY 19 201', '2010', '22', '19', '', '', '', '', '', '195102', '10.1088/0953-8984/22/19/195102', '', '', '', '', '', '', 'WOS:0', 1, 0),
(302, '', 'J', 'de Bernabe, A;Jimenez, R;Garcia-Hernandez, M;Prieto, C;', '', '', '', '', '', 'Elastic behaviour of Si/Ge superlattices determined by Brillouin light scattering', 'THIN SOLID FILMS', '', '', '', '', '5th European Vacuum Conference (EVC 5) / 10th International Conference on Thin Films (ICTF 10)', 'SEP 23-27,', 'UNIV SALAMANCA, SALAMANCA, SPAIN', 'Spanish Vacuum Soc; Int Union Vacuum Sci Technol & Applicat, Vacuum Sci & Thin Film Div', '', '', 'The elastic properties of Si/Ge strained-layer superlattices have been studied by means of Brillouin light scattering spectroscopy. The superstructures, grown along the [001] direction, have composition modulation wavelengths ranging from 1.4 to 5.6 nm and Si/Ge ratios: 1:1, 3:1, 4:1 and 1:4. The study has been carried out in three different stages: (i) the checking of the non-influence from the substrate on the determination of the elastic properties; (ii) the angular dependence of the surface sound velocity within the surface plane; and (iii) the variation of the surface sound velocity with the modulation wavelength. The obtained data of hypersonic surface waves are in good agreement with those calculated from previous results reported in Si and Ge pure single-crystals. No evidence of anomalous supermodulus effect has been found in these superlattices. (C) 1998 Elsevier Science S.A.', '', '', '', '', '', '', '', 4, 4, '', '', '', '0040-6090', '', '', '', 'APR 1 1998', '1998', '317', '1-2', '', '', '', '255', '258', '', '10.1016/S0040-6090(97)00641-X', '', '', '', '', '', '', 'WOS:0', 0, 0),
(289, '', 'J', 'Hassaine, Merzak;Jimenez-Rioboo, Rafael J.;Sharapova, Irina V.;Korolyuk, Oxana A.;Krivchikov, Alexander I.;Ramos, Miguel A.;', '', '', '', '', '', 'Thermal properties and Brillouin-scattering study of glass, crystal, and "glacial" states in n-butanol', 'JOURNAL OF CHEMICAL PHYSICS', '', '', '', '', '', '', '', '', '', '', 'We investigated through noncommercial calorimetry and elastoacoustic Brillouin experiments the phase diagram of n-butanol and measured the specific heat and the thermal conductivity in a wide low-temperature range for its three different states, namely, glass, crystal, and the so-called "glacial" states. The main aim of the work was to shed light on the controversial issue of these allegedly polyamorphic transitions found in some molecular glass-forming liquids, first reported to occur in triphenyl phosphite and later in n-butanol. Our experimental results show that the obtained glacial state in n-butanol is not a homogenous, amorphous state, but rather a mixture of two different coexisting phases, very likely the (frustrated) crystal phase embedded in a disordered, glassy phase.', '', '', '', '', '', '', '', 19, 19, '', '', '', '0021-9606', '', '', '', 'NOV 7 2009', '2009', '131', '17', '', '', '', '', '', '174508', '10.1063/1.3258645', '', '', '', '', '', '', 'WOS:0', 0, 0),
(296, '', 'J', 'Salas, E.;Jimenez Rioboo, R. J.;Prieto, C.;Every, A. G.;', '', '', '', '', '', 'Surface acoustic wave velocity of gold films deposited on silicon substrates at different temperatures', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'Au thin films have been deposited by DC magnetron sputtering on Si (001) substrates at different substrate temperatures, ranging from 200 K to 450 K. With increasing temperature, the expected crystallinity and morphology of the Au thin film are clearly improved, as shown by x ray diffraction, atomic force microscopy and scanning electron microscopy experiments. Parallel to this, the surface acoustic wave propagation velocity shows a clear enhancement toward the ideal values obtained from numerical simulations of a Au thin film on Si (001) substrate. Moreover, a very thin and slightly rough interlayer between the Si (001) substrate and the Au thin film is developed for temperatures above 350 K. The composition and nature of this interlayer is not known. This interlayer may be responsible for the steep change in the structural and elastic properties of the Au thin films at the higher temperatures and possibly also for an improvement of the adhesion properties of the Au on the Si (001) substrate. (C) 2011 American Institute of Physics. [doi:10.1063/1.3606412]', '', '', '', '', '', '', '', 4, 4, '', '', '', '0021-8979', '', '', '', 'JUL 15 201', '2011', '110', '2', '', '', '', '', '', '023503', '10.1063/1.3606412', '', '', '', '', '', '', 'WOS:0', 1, 0),
(291, '', 'J', 'Ramos, M. A.;Hassaine, M.;Kabtoul, B.;Jimenez-Rioboo, R. J.;Shmyt''ko, I. M.;Krivchikov, A. I.;Sharapova, I. V.;Korolyuk, O. A.;', '', '', '', '', '', 'Low-temperature properties of monoalcohol glasses and crystals', 'LOW TEMPERATURE PHYSICS', '', '', '', '', '', '', '', '', '', '', 'We discuss our work on simple aliphatic glass-forming monoalcohols at low temperatures, including experiments on specific heat, thermal conductivity, Brillouin scattering and x-ray diffraction. The family of simple monoalcohols is an interesting model system for exploring molecular glass-forming liquids, the low-temperature universal properties of glasses, and even the glass transition phenomenon itself. More specifically, we examine the role of the molecular aspect ratio in the kinetics of vitrification/crystallization, the reported appearance of particular cases of polymorphism (in ethanol) and polyamorphism (in butanol), and, especially, the influence of positional isomerism and the location of the hydrogen bond on the lattice dynamics and, therefore, on the universal low-temperature properties of glasses. (C) 2013 AIP Publishing LLC.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1063-777X', '', '', '', 'MAY 2013', '2013', '39', '5', '', '', '', '468', '472', '', '10.1063/1.4807147', '', '', '', '', '', '', 'WOS:0', 1, 0),
(303, '', 'J', 'JimenezRioboo, RJ;GarciaHernandez, M;Prieto, C;FuentesGallego, JJ;Blanco, E;RamirezdelSolar, M;', '', '', '', '', '', 'Influence of the microstructure on the macroscopic elastic and optical properties of dried sonogels: A Brillouin spectroscopic study', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The elastic and optical properties of organically modified silicates prepared by ultrasonics aided polycondensation of tetraethoxysilane and polidimethylsiloxane are studied by means of high resolution Brillouin spectroscopy, Nuclear magnetic resonance data evidence the microseparation of the organic and inorganic phases for the systems with high content of polymer formation. The elastic and optical properties are clearly influenced by the change in microstructure, We propose a three component mechanical model that qualitatively explains the observed variation of the elastic constant c(11) versus molar fraction of dimethylsiloxane in these vitreous materials and develop a structural model that accounts for the observed dynamical behavior. (C) 1997 American Institute of Physics.', '', '', '', '', '', '', '', 17, 17, '', '', '', '0021-8979', '', '', '', 'JUN 15 199', '1997', '81', '12', '', '', '', '7739', '7745', '', '', '', '', '', '', '', '', 'WOS:A', 0, 0),
(293, '', 'J', 'Jimenez-Rioboo, R. J.;Cusco, R.;Oliva, R.;Domenech-Amador, N.;Prieto, C.;Ibanez, J.;Boney, C.;Bensaoula, A.;Artus, L.;', '', '', '', '', '', 'Brillouin scattering determination of the surface acoustic wave velocity in In(x)Aa(1-x)AN: A probe into the elastic constants', 'APPLIED PHYSICS LETTERS', '', '', '', '', '', '', '', '', '', '', 'We have determined the surface acoustic wave velocity in InxGa1-xN layers for 0.34 < x < 0.75 by means of high resolution Brillouin spectroscopy. The sagittal dependence of the surface acoustic velocity has been analyzed by comparing the experimental results with theoretical simulations based on the Green''s function formalism. We find the best agreement with our data when the bowing parameters for the elastic constants recently reported from density functional theory calculations are taken into account. The dependence of the surface acoustic wave velocity on alloy composition is given. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4744961]', '', '', '', '', '', '', '', 0, 0, '', '', '', '0003-6951', '', '', '', 'AUG 6 2012', '2012', '101', '6', '', '', '', '', '', '062103', '10.1063/1.4744961', '', '', '', '', '', '', 'WOS:0', 1, 0),
(294, '', 'J', 'Jimenez-Rioboo, R. J.;Cusco, R.;Domenech-Amador, N.;Prieto, C.;Yamaguchi, T.;Nanishi, Y.;Artus, L.;', '', '', '', '', '', 'Surface acoustic waves and elastic constants of InN epilayers determined by Brillouin scattering', 'PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS', '', '', '', '', '', '', '', '', '', '', 'The surface acoustic wave velocity in InN has been experimentally determined by means of Brillouin scattering experiments on c - and m -face epilayers. From simulations based on the Green''s function formalism we determine the shear elastic constants c66 and c44 and propose a complete set of elastic constants for wurtzite InN. The analysis of the sagittal and azimuthal dependence of the surface acoustic wave velocity indicates a slightly different elastic behavior of the m -face sample that basically affects the c44 elastic constant. ((c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)', '', '', '', '', '', '', '', 2, 2, '', '', '', '1862-6254', '', '', '', 'JUN 2012', '2012', '6', '6', '', '', '', '256', '258', '', '10.1002/pssr.201206132', '', '', '', '', '', '', 'WOS:0', 1, 0),
(295, '', 'J', 'Hassaine, Merzak;Ramos, Miguel A.;Krivchikov, A. I.;Sharapova, I. V.;Korolyuk, O. A.;Jimenez-Rioboo, Rafael J.;', '', '', '', '', '', 'Low-temperature thermal and elastoacoustic properties of butanol glasses: Study of position isomerism effects around the boson peak', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'We have concurrently measured the specific heat, the thermal conductivity, and the longitudinal and transverse sound velocities at low temperature of glasses from different isomers of butanol (n-butanol, sec-butanol and isobutanol), as well as the low-temperature specific heat for the crystals of n-butanol, isobutanol and tert-butanol. Whereas the elastic constants both for crystals and glasses are found to be almost independent of the position of the hydrogen bonds, the thermal properties at low temperatures of these glasses at a few kelvin (around the boson peak in the reduced specific heat or around the plateau in the thermal conductivity) are found to vary strongly. Our experiments clearly contradict other works or models claiming a Debye scaling of the boson peak, and hence of the excess low-temperature specific heat of glasses. Data analysis based upon the soft-potential model and its extensions allows us to estimate the Ioffe-Regel limit in these and other alcohol glasses, finding a correlation with the boson-peak position in agreement with that previously reported by other groups.', '', '', '', '', '', '', '', 4, 4, '', '', '', '1098-0121', '', '', '', 'MAR 19 201', '2012', '85', '10', '', '', '', '', '', '104206', '10.1103/PhysRevB.85.104206', '', '', '', '', '', '', 'WOS:0', 1, 0),
(304, '', 'J', 'Jiménez R;Jiménez B;Krüger J.K.;Screiber J;Sayetat F;Mauvy F', 'Jiménez R;Jiménez B;Krüger J.K.;Screiber J;Sayetat F;Mauvy F', '', '', '', '', 'Existence of a second glass transition in the mixed alkali cyanides', 'FERROELECTRICS', '', '', '', '', '', '', '', '', '', '', 'The temperature dependence of the elastic constants of KxNa1-x(CN) mixed crystals is investigated by means of high resoultion Brillouin spectroscopy. Clear hints are found for the existence of an additional classical glass transition. X-Ray measurements support the observation of elastic properties.\r\n	\r\n\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '', '', '', '', '', '1994', '157', '', '', '', '', '141', '146', '', '', '', '', '', '', '', '', '', 0, 0),
(305, '', 'J', 'García-Hernández M; Jiménez Riobóo R. J; Prieto C; Fuentes-Gallego J. J; Blanco E; Ramírez-del-Solar M', 'García-Hernández M; Jiménez Riobóo R. J; Prieto C; Fuentes-Gallego J. J; Blanco E; Ramírez-del-Solar M', '', '', '', '', 'Estudio de la microestructura en sono-ormosils', 'Boletín de la  Sociedad Española de Cerámica y Vidrio', '', '', 'E', '', '', '', '', '', '', '', 'The elastic properties of organically modified silicates prepared by ultrasonics aided polycondensation of Tetraethoxysilane (TEOS) and Polidimethylsiloxane (PDMS) is studied by means of high resolution Brillouin spectroscopy. Our results evidence the micro-separation of the organic and inorganic phases for the systems with high content of polymer. We propose a mechanical model that qualitatively explains the observed variation of the elastic constant c11 vs. molar fraction of dimethylsiloxano (DMS) in these vitreous materials and develop a structural model that accounts for the observed dynamical behaviour.\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '', '', '', '', '', '1997', '36', '', '', '', '', '325', '327', '', '', '', '', '', '', '', '', '', 0, 0),
(306, '', 'J', 'Jiménez Riobóo R. J; García-Hernández M; de Bernabé A; Prieto C', 'Jiménez Riobóo R. J; García-Hernández M; de Bernabé A; Prieto C', '', '', '', '', 'Un método sin contacto para el estudio mecánico estructural de Materiales: Espectroscopía Brillouin', 'Boletín de la  Sociedad Española de Cerámica y Vidrio', '', '', 'E', '', '', '', '', '', '', '', 'Brillouin spectroscopy (BS) is a non destructive and contactless experimental technique which allows the mechanical-structural study of wide range of functional materials as well as of basic interest. We give a brief introduction in this experimental technique and present several examples of its application on different kind of materials.\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '', '', '', '', '', '1997', '36', '', '', '', '', '368', '371', '', '', '', '', '', '', '', '', '', 0, 0),
(307, '', 'J', 'Rioboo, RJJ;Bohn, KP;Kruger, JK;', '', '', '', '', '', 'Elastic anomalies and orientational glass transition in Na(CN)(x)Cl1-x mixed crystals. A Brillouin spectroscopic study', 'EUROPEAN PHYSICAL JOURNAL B', '', '', '', '', '', '', '', '', '', '', 'High performance Brillouin spectroscopy (BS) has been used to study the elastic properties (static and dynamic) of the orientational glassy state of Na(CN)(x)Cl1-x samples (x < x(c) approximate to 0.65). The temperature behaviour of the elastic properties reveals a more complex scenario for the orientational glass transition than generally believed. The shear elastic constant shows the well-known c(44)(T) anomaly. indicated by a minimum, found in other cyanide mixed crystals. The results obtained for the hypersonic attenuation are in clear contradiction with the dynamic character of the c(44)(T)-minimum. The temperature behaviour of the longitudinal elastic constant c(11) of very dilute (x < x(c)) Na(CN)(x)Cl1-x samples shows two striking features: i) Similar to the anomalous temperature behaviour of c(44)(T), lowering the temperature c(11)(T) first decreases, goes through a minimum and then rises again. The minimum takes place at a temperature above the temperature, T-min, where c(44)(T) reaches its minimum value. ii) A kink-like anomaly of c(11)(T) is observed at lower temperatures. This second anomaly is similar to the classical one observed in canonical glasses at their glass transition temperature T-g.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1434-6028', '', '', '', 'FEB 2000', '2000', '13', '4', '', '', '', '643', '651', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(308, '', 'J', 'Assouar, MB;Benedic, F;Elmazria, O;Belmahi, M;Rioboo, RJ;Alnot, P;', '', '', '', '', '', 'MPACVD diamond films for surface acoustic wave filters', 'DIAMOND AND RELATED MATERIALS', '', '', '', '', '11th European Conference on Diamond, Diamond-like Materials, Carbon Nanotubes, Nitrides and Silicon ', 'SEP 03-08,', 'OPORTO, PORTUGAL', 'De Beers Ind Diamonds (UK) Ltd; GFD Gesell Diamantprod mbH; Philips Res Labs; Elsevier Sci', '', '', 'Diamond, due to its high surface acoustic wave (SAW) velocity, offers much attraction for realisation of high frequency SAW filters. To launch elastic waves in solid, the interdigital transducers (IDTs) and a thin layer of suitable piezoelectric material such as ZnO are deposited on diamond film. The most significant requirements of diamond films for SAW filters concern a high resistivity, a high purity, a surface roughness of approximately 10 nm and a large thickness to obtain good characteristics of frequency response (insertion loss, rejection,...). In this work, diamond films deposited on silicon by microwave plasma assisted chemical vapour deposition (MPACVD) in CH4-H-2 gas mixture, are characterised as a function of time deposition and N-2 adjunction in order to determine their capacity to be used as substrates for SAW layered structure filters. The purity, morphology and roughness of the films are characterised by Raman spectroscopy, scanning electron microscopy (SEM), and profilometry. The electrical properties are determined with the four points probe. It is first shown that the films resistance and roughness increase with thickness when the diamond purity, in regard to Raman spectroscopy, remains constant. Secondly, we point out that nitrogen addition in CH4-H-2 gas mixture improves the resistance and the thickness of diamond films while the roughness drastically decreases. These results have a crucial importance for the realisation of good functioning SAW filters. (C) 2001 Elsevier Science B.V. All rights reserved.', '', '', '', '', '', '', '', 18, 28, '', '', '', '0925-9635', '', '', '', 'MAR-JUL 20', '2001', '10', '3-7', 'SI', '', '', '681', '685', '', '10.1016/S0925-9635(00)00493-3', '', '', '', '', '', '', 'WOS:0', 0, 0),
(309, '', 'J', 'Assouar, MB;Elmazria, O;Rioboo, RJ;Sarry, F;Alnot, P;', '', '', '', '', '', 'Modelling of SAW filter based on ZnO/diamond/Si layered structure including velocity dispersion', 'APPLIED SURFACE SCIENCE', '', '', '', '', '4th Porquerolles Workshop on Special Topics in Surface Science', 'SEP 27-OCT', 'ILE PORQUEROLLES, FRANCE', 'CNRS; Commissariat Energie Atom, Dept Rech Etat Condense, Atomes Molec; Grp Francaise Croissance Cri', '', '', 'A simulator based on the coupling of mode (COM) theory, previously developed for modelling the bulk substrate surface acoustic wave (SAW) devices, was modified to be adapted for layered structures. The frequency response of ZnO/diamond/Si-SAW filter was calculated and the results were compared with experimental ones extracted from the literature. A good agreement is obtained for the frequencies within and close to the pass-band of the filter. Outside of this pass-band, the experimental frequency response exhibits an asymmetry, which is not reproduced by the simulation. This asymmetry is attributed to the dispersion, as a function of frequency, of SAW velocity (V-P) and electromechanical coupling coefficient (K-2), which cannot be neglected in the case of layered structures. In the original program developed for bulk structures, K-2 and V were assumed to be constant. To take into account the effect of dispersion, the program was modified by the introduction of a dispersive model. The confrontation between the results obtained by simulation, including the dispersive model, and by experimental measurements shows a good agreement. (C) 2000 Elsevier Science B.V. All rights reserved.', '', '', '', '', '', '', '', 25, 32, '', '', '', '0169-4332', '', '', '', 'SEP 1 2000', '2000', '164', '', '', '', '', '200', '204', '', '10.1016/S0169-4332(00)00338-X', '', '', '', '', '', '', 'WOS:0', 0, 0),
(310, '', 'S', 'Jimenez-Ruiz, M;Jimenez-Rioboo, RJ;Tissen, V;Ramos, MA;Schober, H;', '', '', '', '', 'Kaplyanskii, A; Akimov, A; Bursian, V', 'Brillouin scattering study of methanol-water solutions under pressure', 'PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL. 1, NO. 11', 'Physica Status Solidi C-Current Topics in Solid State Physics', '', '', '', '11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004)', 'JUL 25-30,', 'AF Ioffe Physico Tech Inst, St Petersburg, RUSSIA', '', '', '', 'We have performed a Brillouin scattering study of methanol-water solutions at different molar fraction concentrations of methanol as a function of pressure. For that purpose a diamond anvil cell was used and pressures up to 25 kbar were reached. All measurements were carried out at ambient temperature. The data at P = 1 bar are in accordance with previous Brillouin scattering results, showing a maximum well defined in the elastic constants in the low concentrated solution (methanol poor) and afterwards a decrease for higher methanol concentrations. However, our pressure study for the different methanol concentrations reveals a change in this behavior at P similar to 4 kbar. The results indicate that the applied pressure induces a change in the elastic constants that could be followed in two well defined regimes: from ambient pressure up to 4 kbar and from this pressure to 10 kbar.', '', '', '', '', '', '', '', 1, 1, '', '', '', '1862-6351', '3-527-40588-7', '', '', '2004', '2004', '1', '11', '', '', '', '3178', '3181', '', '10.1002/pssc.200405281', '', '', '', '', '', '', 'WOS:0', 0, 0),
(311, '', 'J', 'Cespedes, E;Jimenez-Rioboo, RJ;Vila, M;Prieto, C;', '', '', '', '', '', 'Brillouin light scattering characterization of the surface acoustic wave velocity in the ZnO/Si3N4/Si(100) system', 'SUPERLATTICES AND MICROSTRUCTURES', '', '', '', '', 'Symposium on ZnO and Related Materials held at the 2005 Spring Meeting of the European-Materials-Res', 'MAY 31-JUN', 'Strasbourg, FRANCE', 'European Mat Res Soc', '', '', 'The Surface Acoustic Wave (SAW) phase velocity of ZnO thin films has been determined by High Resolution Brillouin Light Scattering Spectroscopy in order to Study the influence of an intermediate layer with a set of elastic constants higher than the corresponding ones for ZnO. The study of the system formed by ZnO/Si3N4/Si(100), deposited by reactive magnetron sputtering, shows a SAW phase velocity increment with respect to the ZnO/Si(100) single layer system. Results are discussed in terms of the elasticity theory, which predicts an increase of the acoustic wave phase velocity when an intermediate layer stiffer than the film at the surface is present in the system. (C) 2005 Elsevier Ltd. All rights reserved.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0749-6036', '', '', '', 'JAN-APR 20', '2006', '39', '1-4', '', '', '', '75', '82', '', '10.1016/j.spmi.2005.08.032', '', '', '', '', '', '', 'WOS:0', 0, 0),
(312, '', 'J', 'Ochando, I. M.;Caceres, D.;Garcia-Lopez, J.;Escobar-Galindo, R.;Jimenez-Rioboo, R. J.;Prieto, C.;', '', '', '', '', '', 'Influence of the yttria content on the mechanical properties of Y2O3-ZrO2 thin films prepared by EB-PVD', 'VACUUM', '', '', '', '', '6th Iberian Vacuum Meeting/4th European Topical Conference on Hard Coating', 'JUN 26-28,', 'Salamanca, SPAIN', 'Spanish & Portuguese Vacuum Soc', '', '', 'A mechanical characterization study of the whole range (ZrO2)(1-x)-(Y2O3)(x) system is presented for thin film samples. Films have been prepared by Electron Beam Physical Vapour Deposition (EB-PVD) on Si(1 0 0) substrates. The mechanical characterization, obtained from nanoindentation and Brillouin Light scattering (BLS) techniques, shows a monotonous behaviour between the two pure compounds of the series except for the film with 0.08 Y2O3 molar content of yttria-stabilized zirconia (YSZ) solid solution that presents an anomalous hard value. Additionally, BLS is presented as an alternative technique to the study of the mechanical properties of this system. (C) 2007 Published by Elsevier Ltd.', '', '', '', '', '', '', '', 3, 3, '', '', '', '0042-207X', '', '', '', 'AUG 28 200', '2007', '81', '11-12', '', '', '', '1457', '1461', '', '10.1016/j.vacuum.2007.04.028', '', '', '', '', '', '', 'WOS:0', 0, 0),
(322, '', 'J', 'Jiménez-Villacorta, F;Marion, JL;Oldham, JT;Daniil, M;Willard, MA;Lewis, LH', 'Jimenez-Villacorta, F;Marion, JL;Oldham JT;Daniil, M;Willard, MA;Lewis, LH', '', '', '', '', 'Magnetism-structure correlations during the epsilon-->tau transformation in rapidly-solidified MnAl nanostructured alloys (invited)', 'Metals', '', '', '', '', '', '', '', '', '', '', '\r\n	Magnetic and structural aspects of the annealing-induced transformation of rapidly-solidified Mn55Al45 ribbons from the as-quenched metastable antiferromagnetic (AF) ε-phase to the target ferromagnetic (FM) L10 τ-phase are investigated. The as-solidified material exhibits a majority hexagonal ε-MnAl phase revealing a large exchange bias shift below a magnetic blocking temperature TB~95 K (Hex~13 kOe at 10 K), ascribed to the presence of compositional fluctuations in this antiferromagnetic phase. Heat treatment at a relatively low annealing temperature Tanneal ≈ 568 K (295 °C) promotes the nucleation of the metastable L10 τ-MnAl phase at the expense of the parent ε-phase, donating an increasingly hard ferromagnetic character. The onset of the ε→τ transformation occurs at a temperature that is ~100 K lower than that reported in the literature, highlighting the benefits of applying rapid solidification for synthesis of the rapidly-solidified parent alloy.', '', '', '', '', '', '', '', 0, 0, '', '', '', '', '', '', '', '', '2014', '4', '', '', '', '', '8', '', '', '', '', '', '', '', '', '', '', 0, 0),
(323, '', 'J', 'Jimenez-Villacorta, F; Marion, JL; Oldham JT;Daniil, M; Willard, MA; Lewis, LH', 'Jimenez-Villacorta, F; Marion, JL; Oldham JT;Daniil, M; Willard, MA; Lewis, LH', '', '', '', '', 'Magnetism-structure correlations during the epsilon-->tau transformation in rapidly-solidified MnAl nanostructured alloysâ€ (invited article)', 'METALS', '', '', '', '', '', '', '', '', '', '', 'Magnetic and structural aspects of the annealing-induced transformation of rapidly-solidified Mn55Al45 ribbons from the as-quenched metastable antiferromagnetic (AF) ε-phase to the target ferromagnetic (FM) L10 τ-phase are investigated. The as-solidified material exhibits a majority hexagonal ε-MnAl phase revealing a large exchange bias shift below a magnetic blocking temperature TB~95 K (Hex~13 kOe at 10 K), ascribed to the presence of compositional fluctuations in this antiferromagnetic phase. Heat treatment at a relatively low annealing temperature Tanneal ≈ 568 K (295 °C) promotes the nucleation of the metastable L10 τ-MnAl phase at the expense of the parent ε-phase, donating an increasingly hard ferromagnetic character. The onset of the ε→τ transformation occurs at a temperature that is ~100 K lower than that reported in the literature, highlighting the benefits of applying rapid solidification for synthesis of the rapidly-solidified parent alloy.\r\n	\r\n\r\n	\r\n\r\n	\r\n\r\n	\r\n\r\n	\r\n\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '', '', '', '', '', '2014', '4', '', '', '', '', '8', '', '', '', '', '', '', '', '', '', '', 0, 0),
(371, '', 'J', 'Carmona, N;Bouzas, V;Jimenez, F;Plaza, M;Perez, L;Garcia, MA;Villegas, MA;Llopis, J;', 'Carmona, N.; Bouzas, V.; Jimenez, F.; Plaza, M.; Perez, L.; Garcia, M. A.; Villegas, M. A.; Llopis, J.', '', '', '', '', 'Cobalt (II) environment characterization in sol-gel thermochromic sensors', 'SENSORS AND ACTUATORS B-CHEMICAL', '', '', '', '', '', '', '', '', '', '', 'Optical absorption and magnetic properties of silica sol-gel monoliths doped with cobalt starting from different precursors and water/1-propanol molar ratios are investigated. Structural characterization of the sol-gel by X-ray absorption near-edge structure (XANES) spectroscopy and extended X-ray absorption fine structure (EXAFS) spectroscopy corroborate, that oxidising state of cobalt is Co(2+). Furthermore, the Co(2+) first neighbors are O atoms displaying a temperature transition from octahedral to tetrahedral coordination. The doped monoliths show thermochromic sensor activity ranging from 10 to 50 degrees C, which is related to the environment of Co(2+) ions. The magnetic susceptibility also varies with Co(2+) ions environment due to changes in the orbital contribution to the magnetic moment. Thus, we achieve a better understanding about environment of the Co(2+) ions in the gel matrix and explain their reversible temperature behaviour in spite of the rigid state of the host matrix. (C) 2009 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0925-4005', '', '', '', 'MAR 4', '2010', '145', '1', '', '', '', '139', '145', '', '10.1016/j.snb.2009.11.048', '', '', '', '', '', '', 'WOS:0', 0, 0),
(326, '', 'J', 'Diez-Betriu, X.;Garcia, J. E.;Ostos, C.;Boya, A. U.;Ochoa, D. A.;Mestres, L.;Perez, R.;', '', '', '', '', '', 'Phase transition characteristics and dielectric properties of rare-earth (La, Pr, Nd, Gd) doped Ba(Zr0.09Ti0.91)O-3 ceramics', 'MATERIALS CHEMISTRY AND PHYSICS', '', '', '', '', '', '', '', '', '', '', 'A-site deficient rare-earth doped barium zirconate titanate (BZT) ceramics (Ba(1-y)Ln(2y/3))Zr0.09Ti0.91O3 (Ln = La, Pr, Nd, Gd) are obtained by a modified solid-state reaction method. Perovskite-like single-phase compounds were confirmed from X-ray diffraction data. Morphological analysis on sintered samples shows that the addition of rare-earth ions inhibits the growth of the grain and remarkably changes the grain morphology. The effect of rare-earth addition to BZT on phase transition and dielectric properties is analyzed. A dramatic fall in the transition temperature occurs when BZT ceramic is doped with rare-earths. Moreover, diffusivity degree of the phase transition increases and a relaxor-type behaviour is induced due to both the increment of the lanthanide content and the increase of the ionic radius of the dopant element. High values of dielectric tunability are obtained for lanthanum doped BZT. A direct relation between transition temperature and tunability is discussed. Conclusively, low permittivity and high tunability materials can be obtained by the adequate substitution of rare-earths into BZT ceramics. (C) 2010 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 15, 15, '', '', '', '0254-0584', '', '', '', 'FEB 15 201', '2011', '125', '3', '', '', '', '493', '499', '', '10.1016/j.matchemphys.2010.10.027', '', '', '', '', '', '', 'WOS:0', 0, 0),
(327, '', 'J', 'Cespedes, Eva;Wirz, Men;Sanchez-Garcia, J. A.;Alvarez-Fraga, L.;Escobar-Galindo, R.;Prieto, C.;', '', '', '', '', '', 'Novel Mo-Si3N4 based selective coating for high temperature concentrating solar power applications', 'SOLAR ENERGY MATERIALS AND SOLAR CELLS', '', '', '', '', '', '', '', '', '', '', '\r\n	A novel selective coating material based on Mo-Si3N4 has been investigated for the first time. Accurate combination of the individual component layers based on optical simulations and precise control of layers thickness and composition leads to high solar absorptivity (alpha(Sol)=0.926) and low thermal emissivity (epsilon 25 c=0.017) on a silver film, resulting in a high solar thermal energy conversion efficiency. The tandem absorber is stable in moderate vacuum at temperatures above 600 degrees C showing low emissivity (estimated value at 600 degrees C is epsilon(600) c=0.109) evidencing its relevance for high temperature solar selective applications. A full optical and thermal analysis of a parabolic trough concentrator (PTC) system confirmed the potential of the novel coating material to be used for CSP technology. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0927-0248; 1879-3398', '', '', '', 'MAR 2014', '2014', '122', '', '', '', '', '217', '225', '', '10.1016/j.solmat.2013.12.005', '', '', '', '', '', '', 'WOS:0', 1, 0),
(328, '', 'J', 'Setien-Fernandez, I.;Echaniz, T.;Gonzalez-Fernandez, L.;Perez-Saez, R. B.;Cespedes, E.;Sanchez-Garcia, J. A.;Alvarez-Fraga, L.;Escobar Galindo, R.;Albella, J. M.;Prieto, C.;Tello, M. J.;', '', '', '', '', '', 'First spectral emissivity study of a solar selective coating in the 150-600 degrees C temperature range', 'SOLAR ENERGY MATERIALS AND SOLAR CELLS', '', '', '', '', '', '', '', '', '', '', '\r\n	A complete experimental study of temperature dependence of the total spectral emissivity has been performed, for the first time, for absorber reflector selective coatings used in concentrated solar power (CSP) systems for energy harvesting. The coating consist of double cermet layers of silicon oxide with different amounts of molybdenum over a silver infrared mirror layer. The experimental measurements were carried out by a high accurate radiometer (HAIRL) with controlled atmosphere in the mid-infrared and for temperatures between 150 and 600 degrees CC. The spectral emissivity is nearly constant in this temperature range. Therefore, the temperature dependence of the total emissivity is given by Planck function. These results were compared with those obtained with the usual calculus using room temperature reflectance spectrum. Finally, the performance of the coating was analyzed by comparison of coated respect to non-coated stainless steel. (C) 2013 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 1, 1, '', '', '', '0927-0248', '', '', '', 'OCT 2013', '2013', '117', '', 'SI', '', '', '390', '395', '', '10.1016/j.solmat.2013.07.002', '', '', '', '', '', '', 'WOS:0', 1, 0),
(329, '', 'J', 'Moreira, E.;Fraga, L. A.;Mendonca, M. H.;Monteiro, O. C.;', '', '', '', '', '', 'Synthesis, optical, and photocatalytic properties of a new visible-light-active ZnFe2O4-TiO2 nanocomposite material', 'JOURNAL OF NANOPARTICLE RESEARCH', '', '', '', '', '', '', '', '', '', '', '\r\n	The synthesis of new ZnFe2O4-TiO2 crystalline nanocomposites with enhanced visible-light catalytic performance is reported. Zinc ferrite powders were prepared by a wet method through oxalate precursor at 400 degrees C during 12 h and the nanocomposite materials were obtained through TiO2 incorporation before (ZnFe2O4/TiO2) and after (TiO2/ZnFe2O4) the ZnFe2O4 synthesis. The influence of the nanocomposite design in the structural, morphological, and optical properties of the composite oxide materials was studied, by XRD, SEM/TEM, BET measurements, and DRS. New and improved optical features were observed in the ZnFe2O4-TiO2 absorption spectra comparatively with the TiO2 and ZnFe2O4 ones. These results are discussed based on the interface effect and a proposal for the photogenerated electron transitions in the ZnFe2O4-TiO2 is presented. The photocatalytic performance of the prepared samples was evaluated for the methyl orange (MO) degradation process. From all the tested materials, the TiO2/ZnFe2O4 was the one with the best photocatalytic activity, even superior to the nanocrystalline TiO2 one. 100 % reduction of the MO concentration was achieved after 10 min of UV-Vis irradiation on a 10 ppm dye aqueous solution with 0.43 g L-1 of TiO2/ZnFe2O4 catalyst. By performing visible-light experiments, it was possible to discuss the influence of the visible-light absorption, charge separation, and photogenerated charge-carrier recombination in the TiO2/ZnFe2O4 photocatalytic performance.', '', '', '', '', '', '', '', 1, 1, '', '', '', '1388-0764', '', '', '', 'JUN 2012', '2012', '14', '6', '', '', '', '', '', '937', '10.1007/s11051-012-0937-y', '', '', '', '', '', '', 'WOS:0', 0, 0),
(333, '', 'J', 'Perez-Castaneda, T;Jimenez-Rioboo, RJ;Ramos, MA;', 'Perez-Castaneda, Tomas; Jimenez-Rioboo, Rafael J.; Ramos, Miguel A.', '', '', '', '', 'Two-Level Systems and Boson Peak Remain Stable in 110-Million-Year-Old Amber Glass', 'PHYSICAL REVIEW LETTERS', '', '', '', '', '', '', '', '', '', '', 'The two most prominent and ubiquitous features of glasses at low temperatures, namely the presence of tunneling two-level systems and the so-called boson peak in the reduced vibrational density of states, are shown to persist essentially unchanged in highly stabilized glasses, contrary to what was usually envisaged. Specifically, we have measured the specific heat of 110 million-year-old amber samples from El Soplao (Spain), both at very low temperatures and around the glass transition T-g. In particular, the amount of two-level systems, assessed at the lowest temperatures, was surprisingly found to be exactly the same for the pristine hyperaged amber as for the, subsequently, partially and fully rejuvenated samples.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0031-9007', '', '', '', 'APR 22', '2014', '112', '16', '', '', '', '', '', '165901', '10.1103/PhysRevLett.112.165901', '', '', '', '', '', '', 'WOS:0', 1, 0),
(383, '', 'J', 'Jimenez-Villacorta, F;Prieto, C;', 'Jimenez-Villacorta, F.; Prieto, C.', '', '', '', '', 'Magnetic properties and interaction mechanisms of iron-based core-shell structures prepared by sputtering at low substrate temperatures', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'The magnetic properties of partially oxidized nanocrystalline iron thin films prepared by DC-magnetron sputtering at low substrate temperatures in the 175-300 K range are studied. The preparation method is presented as a simple method for fabricating granular structures. Films prepared at intermediate temperatures exhibit granular magnetic behaviour, in which nanocrystalline grains act as almost decoupled particles, surrounded by an oxide shell, forming exchange bias core-shell systems. The magnetic features of granular systems obtained by this new method are described and the mechanisms of interaction between metallic grains and their oxide shells are explained, as are their effects in the magnetization reversal process.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0953-8984', '', '', '', 'FEB 27', '2008', '20', '8', '', '', '', '', '', '085216', '10.1088/0953-8984/20/8/085216', '', '', '', '', '', '', 'WOS:0', 0, 0),
(384, '', 'J', 'Riccitelli, R;Di Carlo, A;Fiori, A;Orlanducci, S;Terranova, ML;Santoni, A;Fantoni, R;Rufoloni, A;Villacorta, FJ;', 'Riccitelli, Riccardo; Di Carlo, Aldo; Fiori, Angelamaria; Orlanducci, Silvia; Terranova, Maria Letizia; Santoni, Antonino; Fantoni, Roberta; Rufoloni, Alessandro; Villacorta, Felix Jimenex', '', '', '', '', 'Field emission from silicon nanowires: Conditioning and stability', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'We report the low-pressure chemical vapor deposition growth and field emission characterization of silicon nanowires (SiNWs). Our field emission results show the importance of the so called conditioning process on the reproducibility of the emission performance itself; this effect has proven to be reversible for the investigated current regime. We explained this behavior by invoking a current-driven desorption of residual adsorbed gases. A highly reproducible turn-on electric field of 27 V/mu m is found for a diode-connected SiNW planar sample. Furthermore, stability analysis is performed showing the technologically promising field emission behavior of the samples.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'SEP 1', '2007', '102', '5', '', '', '', '', '', '054906', '10.1063/1.2776225', '', '', '', '', '', '', 'WOS:0', 0, 0),
(385, '', 'J', 'Jimenez-Villacorta, F;Huttel, Y;Munoz-Martin, A;Ballesteros, C;Roman, E;Prieto, C;', 'Jimenez-Villacorta, F.; Huttel, Y.; Munoz-Martin, A.; Ballesteros, C.; Roman, E.; Prieto, C.', '', '', '', '', 'Core-shell nanocrystalline structures in oxidized iron thin films prepared by sputtering at very low temperatures', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'We report on the effect of preparation temperature in the magnetic properties of oxidized iron thin films deposited by dc-magnetron sputtering below room temperature. Films prepared at 300 K show a typical thin film magnetic behavior, whereas samples prepared at 200 K present visible features of granular core-shell system formed by an oxide shell surrounding a ferromagnetic core and displaying exchange anisotropy. These differences are directly linked to the film microstructure and composition. We present results of microstructure, composition, and chemical analysis in order to discuss the observed magnetic behavior. Size and shape of iron crystallographic grains were characterized by transmission electron microscopy. Depth-resolved compositional characterization, obtained by ion-beam analysis techniques, has probed the penetration of oxygen along the thickness of the films and x-ray photoelectron spectroscopy was used to identify the different iron oxide species present in the structures. (c) 2007 American Institute of Physics.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'JUN 1', '2007', '101', '11', '', '', '', '', '', '113914', '10.1063/1.2737389', '', '', '', '', '', '', 'WOS:0', 0, 0),
(386, '', 'J', 'Santoni, A;Villacorta, FJ;Rufoloni, A;Mancini, A;', 'Santoni, A.; Villacorta, F. Jimenez; Rufoloni, A.; Mancini, A.', '', '', '', '', 'Growth of Au-catalysed Si nanowires by low pressure chemical vapour deposition on Si(100) and amorphous Si surfaces', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', '', '', '', '', '', '', '', '', 'Au-mediated Si nanowires (SiNW) have been grown at low temperatures (500-560 degrees C) on crystalline Si(100) and amorphous Si surfaces by means of low pressure chemical vapour deposition from Si2H6 in the 0.05-1.2 mbar range. The influence of the substrates on the nanowire (NW) growth and morphology has been investigated by means of x-ray photoelectron spectroscopy and scanning electron microscopy. No NW growth has been observed on the Au covered amorphous Si surfaces. On both substrates, the NW exhibit inhomogeneous sidewalls and a new morphology showing NW entrenchment which has been explained as a consequence of vapour-liquid-solid growth termination due to Au diffusion on the SiNW sidewalls.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0953-8984', '', '', '', 'DEC 6', '2006', '18', '48', '', '', '', '10853', '10859', '', '10.1088/0953-8984/18/48/012', '', '', '', '', '', '', 'WOS:0', 0, 0),
(387, '', 'J', 'Jimenez-Villacorta, F;Munoz-Martin, A;Prieto, C;', 'Jimenez-Villacorta, F.; Munoz-Martin, A.; Prieto, C.', '', '', '', '', 'Study of oxidized iron thin films by non-Rutherford elastic scattering', 'NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATO', '', '', '', '', '17th International Conference on Ion Beam Analysis', 'JUN 26-JUL', 'Seville, SPAIN', 'Univ Autonoma Madrid, Univ Sevilla, Junta Andalucia, Minist Educ & Ciencia, Consejo Superior Investi', '', '', 'Rutherford and non-Rutherford elastic scattering analyses have been performed to characterize oxidized iron thin films grown by sputtering. The oxygen depth profiles along the thickness of all the samples have been studied in order to unravel the oxidation process of these samples. The oxygen concentration along the film was related to the sample preparation parameters, resulting in a strong dependence of oxygen depth profile on the substrate temperature during deposition. (c) 2006 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0168-583X', '', '', '', 'AUG', '2006', '249', '', '', '', '', '486', '489', '', '10.1016/j.nimb.2006.03.036', '', '', '', '', '', '', 'WOS:0', 0, 0),
(388, '', 'J', 'Jimenez-Villacorta, F;Munoz-Martin, A;Ramirez, R;Prieto, C;', 'Jimenez-Villacorta, F; Munoz-Martin, A; Ramirez, R; Prieto, C', '', '', '', '', 'Magnetic properties of oxidized iron thin films grown by sputtering at very low temperatures', 'MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS', '', '', '', '', 'Meeting of the European-Materials-Research-Society', 'MAY 30-JUN', 'Strasbourg, FRANCE', 'European Materials Res Soc', '', '', 'Iron thin films have been grown by DC magnetron sputtering using Si(l 00) wafers as substrates, and then oxidized in a well-controlled oxygen atmosphere in the vacuum chamber. Film thickness is about 50 nm, and grains forming these samples do not exceed 20 rim. In order to control structural properties such as size and shape of these grains, growth conditions can be modified, like deposition rate or substrate temperature, varying from 150 to 300 K. Two sets of samples have been prepared considering deposition rate: (i) films grown at 0.6 nm/min and (ii) at 1.2 nm/min. In order to prevent iron films from natural oxidation, all the sample series were covered with a gold layer. Analysis of their magnetic behaviour shows a strong dependence on grain size and temperature, resulting in a more effective oxidation for samples prepared at higher deposition rates and lower substrate temperatures, which behaves as a Fe/Fe oxide granular system. (c) 2005 Elsevier B.V All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0928-4931', '', '', '', 'JUL', '2006', '26', '5-7', 'SI', '', '', '1141', '1145', '', '10.1016/j.msec.2005.09.023', '', '', '', '', '', '', 'WOS:0', 0, 0),
(389, '', 'J', 'Stankiewicz, J;Jimenez-Villacorta, F;Prieto, C;', 'Stankiewicz, J; Jimenez-Villacorta, F; Prieto, C', '', '', '', '', 'Magnetotransport properties of oxidized iron thin films', 'PHYSICAL REVIEW B', '', '', '', '', '', '', '', '', '', '', 'We report results of electrical resistivity, Hall effect, and anisotropic magnetoresistance (AMR) measurements performed on thin films (similar to 80 nm) of naturally oxidized iron in the 5 to 300 K temperature range, and in magnetic fields up to 5 T. The films were grown at low temperatures. We find that the resistivity, coercive field, as well as the magnetoresistance of the films are affected by growth conditions, particularly by the substrate temperature which controls the size and shape of crystalline grains. We used AMR as a probe for magnetization reversal studies in our films. We find that the coercive fields vary as root T as in systems of weakly interacting ensembles of magnetic nanoparticles even though dipole-dipole interactions may well play a significant role.', '', '', '', '', '', '', '', 0, 0, '', '', '', '1098-0121', '', '', '', 'JAN', '2006', '73', '1', '', '', '', '', '', '014429', '10.1103/PhysRevB.73.014429', '', '', '', '', '', '', 'WOS:0', 0, 0),
(390, '', 'J', 'Jimenez-Villacorta, F;Munoz-Martin, A;Prieto, C;', 'Jimenez-Villacorta, F; Munoz-Martin, A; Prieto, C', '', '', '', '', 'EXAFS study of non-spherical nanoparticles in oxidized iron thin films grown by sputtering at very low temperatures', 'NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATO', '', '', '', '', '4th International Conference on Synchrotron Radiation in Materials Science (SRMS-4)', 'AUG 23-25,', 'Grenoble, FRANCE', '', '', '', 'A detailed study of EXAFS data has been used to evaluate the microstructural properties of grains forming the sample. A new model is proposed to determine the average dimensions of nanometric thin film iron grains, considering them as elongated particles, and taking into account polarization of the incident X-ray. Results show a clear decrease of grain size as the preparation temperature diminishes, and they are in very good agreement with previous measurements determined by X-ray diffraction techniques. (c) 2005 Elsevier B.V. All rights reserved.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0168-583X', '', '', '', 'AUG', '2005', '238', '1-4', '', '', '', '340', '345', '', '10.1016/j.nimb.2005.06.073', '', '', '', '', '', '', 'WOS:0', 0, 0),
(391, '', 'J', 'Jimenez-Villacorta, F;Munoz-Martin, A;Vila, M;Prieto, C;Traverse, A;', 'Jimenez-Villacorta, F.; Munoz-Martin, A.; Vila, M.; Prieto, C.; Traverse, A.', '', '', '', '', 'EXAFS and XRD characterization of iron thin films prepared by sputtering at very low temperatures', 'PHYSICA SCRIPTA', '', '', '', '', '', '', '', '', '', '', 'Iron thin films of less than 100 nm have been grown on Si(100) wafers by DC magnetron sputtering at well-controlled substrate temperatures. Three different sets of samples have been prepared in order to study the influence of the preparation conditions on their magnetic properties: i) natural oxidized samples, ii) "in-situ" partially oxidized and iii) non-oxidized iron thin films. For the last two sets, a gold film prior to expose the air capped the samples. XRD and EXAFS experiments have been performed to obtain the size and the shape of the grains. They provide a columnar growth for samples prepared at room temperature and a diminution of the grain size along the normal to the surface when the preparation temperature decreases.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0031-8949', '', '', '', '', '2005', 'T115', '', '', '', '', '450', '453', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(392, '', 'J', 'Vila, M;Jimenez-Villacorta, F;Prieto, C;Traverse, A;', 'Vila, M.; Jimenez-Villacorta, F.; Prieto, C.; Traverse, A.', '', '', '', '', 'EXAFS characterization of nickel clusters in Ni/Si3N4 sputtered thin films', 'PHYSICA SCRIPTA', '', '', '', '', '', '', '', '', '', '', 'Ni and Si3N4 layers have been alternatively deposited by sputtering in order to study Ni clusters embedded in amorphous Si3N4. The nominal Ni layer thickness has been varied from 2 to 60 angstrom and the number of layers was planned to have a similar total amount of Ni. The decrease in the Ni-Ni coordination number observed by Extended X-ray Absorption Fine Structure spectroscopy has been used to study the microstructure of the Ni clustering. For small Ni layer thickness, the actual Ni layer becomes discontinuous and an average cluster diameter of Ni clusters can be determined. Ni metallic cluster in the Ni/Si3N4 system show a magnetization smaller than in bulk nickel, the decrease of magnetization of the cluster should be attributed to a dead skin at the surface of the Ni-clusters.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0031-8949', '', '', '', '', '2005', 'T115', '', '', '', '', '454', '456', '', '', '', '', '', '', '', '', 'WOS:0', 0, 0),
(393, '', 'J', 'Jimenez-Villacorta, F;Munoz-Martin, A;Prieto, C;', 'Jimenez-Villacorta, F; Munoz-Martin, A; Prieto, C', '', '', '', '', 'X-ray diffraction and extended x-ray absorption fine-structure characterization of nonspherical crystallographic grains in iron thin films', 'JOURNAL OF APPLIED PHYSICS', '', '', '', '', '', '', '', '', '', '', 'The characterization of iron thin films grown at different substrate temperatures has been performed by x-ray diffraction (XRD) and extended x-ray absorption fine structure (EXAFS). The film growing of iron at low temperatures provides an excellent system to test the results obtained from both techniques because the crystallographic grains present a variation of size and shape as a function of the growing temperature. In both cases, the shape of the particle must be taken into account to calculate their size. The comparison gives a very good agreement when appropriate models are used, showing the reasons for possible differences between the results obtained from a more simple XRD and EXAFS analysis applied to columnar growth systems. (C) 2004 American Institute of Physics.', '', '', '', '', '', '', '', 0, 0, '', '', '', '0021-8979', '', '', '', 'DEC 1', '2004', '96', '11', '', '', '', '6224', '6229', '', '10.1063/1.1810636', '', '', '', '', '', '', 'WOS:0', 0, 0),
(394, '', 'J', 'Aleksandrova, Ralitsa;Philipp, Martine;Muller, Ulrich;Rioboo, Rafael Jimenez;Ostermeyer, Martin;Sanctuary, Roland;Muller-Buschbaum, Peter;Kruger, Jan K;', '', '', '', '', '', 'Phase Instability and Molecular Kinetics Provoked by Repeated Crossing of the Demixing Transition of PNIPAM Solutions.', 'Langmuir : the ACS journal of surfaces and colloids', '', '', '', '', '', '', '', '', '', '', 'The demixing process of aqueous poly(N-isopropylacrylamide) (PNIPAM) solutions can occur either via a nucleation and growth process or via spinodal decomposition. The ensuing self-assembly, leading to heterogeneous morphologies within the PNIPAM solution, is codetermined by kinetic processes caused by molecular transport. By subjecting PNIPAM solutions to cyclic changes in temperature leading to repeated crossing of the demixing transition, we are able to assess the importance of kinetics as well as of overheating and supercooling of the phase transition within the metastable range delimited by the binodal and spinodal lines. First indications about the location of these stability limits for the low- and high-temperature phases, separated by about 1.6 K, could be gained by detailed kinetic studies of the refractive index. These investigations are made possible due to the novel technique of temperature-modulated optical refractometry.\r\n\r\n	', '', '', '', '', '', '', '', 0, 0, '', '', '', '', '', '', '', '2014-Oct-7', '2014', '30', '39', '', '', '', '11792', '801', '', '10.1021/la5026763', '', '', '', '', '', '', 'MEDLI', 1, 0),
(395, '', 'J', 'Diez-Betriu, X;Mompeam, FJ;Munuera, C;Rubio-Zuazo, J;Menendez, R;Castro, GR;de Andres, A;', 'Diez-Betriu, Xavier; Mompeam, Federico J.; Munuera, Carmen; Rubio-Zuazo, Juan; Menendez, Rosa; Castro, German R.; de Andres, Alicia', '', '', '', '', 'Graphene-oxide stacking and defects in few-layer films: Impact of thermal and chemical reduction', 'CARBON', '', '', 'English', 'Article', '', '', '', '', '', '', 'The stacking modes of graphene oxide monolayers (GO) when forming thin films is a crucial aspect determining many properties especially those related with transport. Stacking, morphology and effects of thermal and chemical reduction are studied combining in-situ synchrotron radiation diffraction and atomic force microscopy with simulations. The GO flakes mimic the substrate morphology and present an almost perfect stacking for few-layer films (2-10 layers) when in-plane flake size is large enough. The interlayer distance is found to be 1 nm irrespective of the film thickness and drastic discontinuities upon thermal annealing are observed between 100 and 200 degrees C. Moreover, the short GO-GO distance (0.38 nm) observed at temperatures (500 degrees C) where oxygen content is still high indicates that stacking is mainly governed by embedded water molecules. The large interlayer distance (0.76 nm) in chemically reduced films and its robustness against thermal annealing are due to the folding of the edges of the flakes occurring upon the elimination of the functional groups. The central part of the flakes remains extremely flat contrary to what occurs with thermal reduction. These structural defects induced by chemical and thermal reduction processes are very probably the most important limitations for electrical conductivity in GO based electrodes. (C) 2014 Elsevier Ltd. All rights reserved.', '[Diez-Betriu, Xavier; Mompeam, Federico J.; Munuera, Carmen; Rubio-Zuazo, Juan; Castro, German R.; de Andres, Alicia] CSIC, Inst Ciencia Mat Madrid, E', 'de Andres, A (reprint author), CSIC, Inst Ciencia Mat Madrid, Plaza Murillo 2, E-28049 Madrid, Spain.', 'ada@icmm.csic.es', 'Spanish MINECO [MAT2012-37276-C03-01, MAT2011-27470-C02-02, CSD2009-00050, CSD2009-00013]; Juan de la Cierva [JCI-2011-08815]; European Union [604391]', 'X.D. acknowledges a FPI scholarship from Spanish MINECO and C.M. thanks financial support from the "Juan de la Cierva" postdoctoral program JCI-2011-0', '', '32', 0, 0, 'PERGAMON-ELSEVIER SCIENCE LTD', 'OXFORD', 'THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND', '0008-6223', '', 'CARBON', 'Carbon', 'DEC', '2014', '80', '', '', '', '', '40', '49', '', '10.1016/j.carbon.2014.08.016', '', '10', '', 'Chemi', 'Chemi', 'AS2TN', 'WOS:0', 1, 1),
(396, '', 'J', 'Goncalves, G;Vila, M;Bdikin, I;de Andres, A;Emami, N;Ferreira, RAS;Carlos, LD;Gracio, J;Marques, PAAP;', 'Goncalves, Gil; Vila, Mercedes; Bdikin, Igor; de Andres, Alicia; Emami, Nazanin; Ferreira, Rute A. S.; Carlos, Luis D.; Gracio, Jose; Marques, Paula A. A. P.', '', '', '', '', 'Breakdown into nanoscale of graphene oxide: Confined hot spot atomic reduction and fragmentation', 'SCIENTIFIC REPORTS', '', '', 'English', 'Article', '', '', '', '', '', '', 'Nano-graphene oxide (nano-GO) is a new class of carbon based materials being proposed for biomedical applications due to its small size, intrinsic optical properties, large specific surface area, and easy to functionalize. To fully exploit nano-GO properties, a reproducible method for its production is of utmost importance. Herein we report, the study of the sequential fracture of GO sheets onto nano-GO with controllable lateral width, by a simple, and reproducible method based on a mechanism that we describe as a confined hot spot atomic fragmentation/reduction of GO promoted by ultrasonication. The chemical and structural changes on GO structure during the breakage were monitored by XPS, FTIR, Raman and HRTEM. We found that GO sheets starts breaking from the defects region and in a second phase through the disruption of carbon bonds while still maintaining crystalline carbon domains. The breaking of GO is accompanied by its own reduction, essentially by the elimination of carboxylic and carbonyl functional groups. Photoluminescence and photothermal studies using this nano-GO are also presented highlighting the potential of this nanomaterial as a unique imaging/therapy platform.', '[Goncalves, Gil; Vila, Mercedes; Bdikin, Igor; Gracio, Jose; Marques, Paula A. A. P.] Univ Aveiro, Dept Mech Engn, TEMA NRD, P-3810193 Aveiro, Portuga', 'Goncalves, G (reprint author), Univ Aveiro, Dept Mech Engn, TEMA NRD, P-3810193 Aveiro, Portugal.', 'ggoncalves@ua.pt; paulam@ua.pt', 'Fundacao para a Ciencia e Tecnologia (FCT) [SFRH/BDP/84419/2012]; MINECO [MAT2012-37276-C03-01]; FCT; Fundacao para a Ciencia e a Tecnologia (FCT, Por', 'Gil Goncalves thanks the Fundacao para a Ciencia e Tecnologia (FCT) for the PostDoc grant (SFRH/BDP/84419/2012). A de Andres thanks MINECO (MAT2012-37', '', '66', 0, 0, 'NATURE PUBLISHING GROUP', 'LONDON', 'MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND', '2045-2322', '', 'SCI REP-UK', 'Sci Rep', 'OCT 23', '2014', '4', '', '', '', '', '', '', '6735', '10.1038/srep06735', '', '8', '', 'Multi', 'Scien', 'AR5AK', 'WOS:0', 1, 1),
(397, '', 'J', 'Borlaf, M;Colomer, MT;de Andres, A;Cabello, F;Serna, R;Moreno, R;', 'Borlaf, Mario; Colomer, Maria T.; de Andres, Alicia; Cabello, Fatima; Serna, Rosalia; Moreno, Rodrigo', '', '', '', '', 'TiO2/Eu3+ Thin Films with High Photoluminescence Emission Prepared by Electrophoretic Deposition from Nanoparticulate Sols', 'EUROPEAN JOURNAL OF INORGANIC CHEMISTRY', '', '', 'English', 'Article', '', '', '', '', '', 'Luminescence; Thin films; Nanoparticles; Electrophoretic deposition; Sol-gel processes; Titanium; Europium', 'The light emission properties of anatase TiO2/Eu3+ thin films prepared by electrophoretic deposition and of the corresponding precursor nanoparticulate sols and xerogels with different Eu3+ contents are reported. Transparent anatase TiO2 thin films were successfully obtained by electrophoretic deposition after dilution of the original sols with ethanol in order to inhibit the water hydrolysis and facilitate the drying process. The topography of the films shows a high homogeneous distribution in terms of grain size and roughness of the surface of the thin films. The film thickness varied from 50 nm to 800 nm and it was found to be strongly dependent on the Eu3+ content of the sols, probably because of uncompensated electrical charges provided by Eu3+ ions located at the surface of the nanoparticles. A spontaneous densification of the films occurs at a thickness above 400 nm and, concomitantly, a significant increase of the Eu3+ emission efficiency is detected.', '[Borlaf, Mario; Colomer, Maria T.; Moreno, Rodrigo] CSIC, Inst Ceram & Vidrio, E-28049 Madrid, Spain; [de Andres, Alicia] CSIC, Inst Ciencia Mat Madri', 'Borlaf, M (reprint author), Univ Fed Santa Catarina, Lab Mat Vitroceram VITROCER, Campus Univ Trindade, BR-88040900 Florianopolis, SC, Brazil.', 'mborlaf@icv.csic.es', 'Spanish Ministry of Economy and Competitiveness (MINECO) [MAT2012-31090, TEC2012-38901-C02-01, MAT2012-37276-C03-01]; Consejo Superior de Investigacio', 'This study has been supported by the Spanish Ministry of Economy and Competitiveness (MINECO) through projects MAT2012-31090, TEC2012-38901-C02-01 and', '', '35', 0, 0, 'WILEY-V C H VERLAG GMBH', 'WEINHEIM', 'BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY', '1434-1948', '', 'EUR J INOR', 'Eur. J. In', 'OCT', '2014', '', '30', '', '', '', '5152', '5159', '', '10.1002/ejic.201402445', '', '8', '', 'Chemi', 'Chemi', 'AS6GK', 'WOS:0', 1, 0),
(398, '', 'J', 'Ramirez-Jimenez, R;Tardio, M;Munoz-Santiuste, JE;de Andres, A;', 'Ramirez-Jimenez, R.; Tardio, M.; Munoz-Santiuste, J. E.; de Andres, A.', '', '', '', '', 'Highly efficient electroluminescence in sapphire and magnesia', 'JOURNAL OF LUMINESCENCE', '', '', 'English', 'Article', '', '', '', '', '', 'Electroluminescence; F-type centers; Oxide crystals: MgO:Li and Al2O3:Mg; Light emitting diodes (LEDs)', 'Electroluminescence (EL) has been obtained and studied in two different wide band gap oxide crystals: MgO:Li (7.8 eV) and Al2O3:Mg (8.8 eV). EL requires crystal doping with Li or Mg to induce p-type conductivity and the formation of F-type centers which are the deep levels within the band gap for electron hole recombination. Oxidizing treatments are required in Al2O3:Mg to reach adequate conductivities. The main EL emissions are at 2.35 eV (528 nm) for MgO:Li crystals and at 3.8 eV (327 nm) for Al2O3:Mg. Trace impurities also produce EL in the visible region, their control may be used for color designed LEDs. (C) 2014 Elsevier B.V. All rights reserved.', '[Ramirez-Jimenez, R.; Tardio, M.; Munoz-Santiuste, J. E.] Univ Carlos III Madrid, Escuela Politecn Super, Dept Fis, Madrid 28911, Spain; [de Andres, A', 'Tardio, M (reprint author), Univ Carlos III Madrid, Escuela Politecn Super, Dept Fis, Ave Univ 30, Madrid 28911, Spain.', 'mtardio@fis.uc3m.es', 'Spanish MINECO [MAT2012-37276-C03-01]; Comunidad Autonoma de Madrid PHAMA [S2009/MAT-1756]', 'We acknowledge financial support from Spanish MINECO, MAT2012-37276-C03-01, and Comunidad Autonoma de Madrid PHAMA S2009/MAT-1756.', '', '24', 0, 0, 'ELSEVIER SCIENCE BV', 'AMSTERDAM', 'PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS', '0022-2313', '', 'J LUMIN', 'J. Lumines', 'SEP', '2014', '153', '', '', '', '', '291', '295', '', '10.1016/j.jlumin.2014.03.049', '', '5', '', 'Optic', 'Optic', 'AK4KC', 'WOS:0', 1, 0),
(399, '', 'J', 'de Miguel-Diiez, J;Jimenez-Garcia, R;Hernandez-Barrera, V;de Andres, AL;Villa-Asensi, JR;Plaza, V;Carrasco-Garrido, P;', 'de Miguel-Diez, Javier; Jimenez-Garcia, Rodrigo; Hernandez-Barrera, Valentin; Lopez de Andres, Ana; Ramon Villa-Asensi, Jose; Plaza, Vicente; Carrasco-Garrido, Pilar', '', '', '', '', 'National trends in hospital admissions for asthma exacerbations among pediatric and young adult population in Spain (2002-2010)', 'RESPIRATORY MEDICINE', '', '', 'English', 'Article', '', '', '', '', '', 'Asthma exacerbations; Incidence; Cost; Mortality; Outcome research; Spain', 'Objective: To assess the changes in incidence, use of mechanical ventilation, length of stay (LOS), costs and mortality of children (0-15 years) and young adults (16-45 years) hospitalized for asthma exacerbations. Methods: We included patients hospitalized for asthma exacerbations in Spain from 2002 to 2010 (ICD9-CM codes 493.0x-493.9x). The data were collected from the National Hospital Discharge Database (entire population). We calculated the yearly age- and sex-specific incidence rates for each of the two groups. Results: We included a total of 12,038 pediatric patients and 2792 young adults hospitalized for asthma exacerbations. Overall crude incidence decreased from 20.5 to 18.7 admissions per 100.000 inhabitants in the pediatric group (p < 0.05), and from 4.12 to 3.68 admissions per 100.000 inhabitants among young adults, from 2002 to 2010 (p < 0.05). By contrast, we detected a significant increase in the use of non-invasive ventilation (NIV) in both groups. The average LOS decreased during the study period, from 3.71 (SD 2.28) to 3.16 (SD 2.11) days (p < 0.05) among pediatric patients and there were not changes among young adults. During the study period, the mean cost per patient decreased from 1558.53 (SD 443.63) to 1378.41 (SD 472.71) euros in the pediatric group (p < 0.05), while increased from 2183.44 (SD 783.15) to 2564.32 (SD 1933.98) euros among young adults (p < 0.05). Conclusion: Our results suggest a decrease in the incidence of hospital admissions for asthma exacerbations with concomitant increase in use of NIV in asthmatic patients, both pediatric and young adults patients. Although LOS and mean cost have decreased among pediatric patients, they have not changed and increased, respectively, among young adults. A better management of the disease at primary care services may explain the improvement in the incidence and outcomes. (C) 2014 Elsevier Ltd. All rights reserved.', '[de Miguel-Diez, Javier] Univ Complutense Madrid, Dept Resp Med, Hosp Gen Gregorio Maranon, Inst Invest Sanitaria Gregorio Marar IiSGM, Madrid, Spain;', 'de Miguel-Diiez, J (reprint author), Hosp Gen Gregorio Maranon, Dept Resp Med, C Doctor Esquerdo 46, Madrid 28007, Spain.', 'javier.miguel@salud.madrid.org', '', '', '', '31', 0, 0, 'W B SAUNDERS CO LTD', 'LONDON', '32 JAMESTOWN RD, LONDON NW1 7BY, ENGLAND', '0954-6111', '', 'RESP MED', 'Respir. Me', 'JUL', '2014', '108', '7', '', '', '', '983', '991', '', '10.1016/j.rmed.2014.04.008', '', '9', '', 'Cardi', 'Cardi', 'AL0NA', 'WOS:0', 0, 0),
(500, '', 'J', 'Jimenez-Rioboo, RJ;Artus, L;Cusco, R;Taniguchi, T;Cassabois, G;Gil, B;', 'Jimenez-Rioboo, R. J.; Artus, L.; Cusco, R.; Taniguchi, T.; Cassabois, G.; Gil, B.', '', '', '', '', 'In- and out-of-plane longitudinal acoustic-wave velocities and elastic moduli in h-BN from Brillouin scattering measurements', 'APPLIED PHYSICS LETTERS', '', '', 'English', 'Article', '', '', '', '', '', '', 'The elastic constants of high-quality, single-crystal hexagonal boron nitride (h-BN) have been measured by means of high resolution Brillouin spectroscopy using a modified reflected light microscope. The sound propagation velocity in the c-axis direction and perpendicular to the c-axis have been obtained from the Brillouin frequency shift, with a proper account taken of the vast difference between the ordinary and extraordinary refractive indices recently reported in the highly anisotropic layered h-BN crystal. The elastic constants c(11) and c(33) obtained from the Brillouin experiments are somewhat lower than previous determinations based on inelastic x-ray measurements and confirm the overestimation of the h-BN elastic constants by ab initio calculations based on density functional perturbation theory in the local density approximation. Published by AIP Publishing.', '[Jimenez-Rioboo, R. J.] CSIC, Inst Ciencia Mat Madrid, Sor Juana Ines de la Cruz 3, E-28049 Madrid, Spain; [Artus, L.; Cusco, R.] CSIC, Inst Jaume Alm', 'Jimenez-Rioboo, RJ (reprint author), CSIC, Inst Ciencia Mat Madrid, Sor Juana Ines de la Cruz 3, E-28049 Madrid, Spain.', '', 'Spanish MINECO/FEDER [MAT2015-71035-R, MAT2015-65356-C3-1-R]; Russian Megagrant program (Ioffe Institute of RAS) [14.W03.31.0011]; Elemental Strategy ', 'This work was supported by the Spanish MINECO/FEDER under Contract Nos. MAT2015-71035-R and MAT2015-65356-C3-1-R. B.G. acknowledges the Russian Megagr', '', '21', 0, 0, 'AMER INST PHYSICS', 'MELVILLE', '1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA', '0003-6951', '', 'APPL PHYS ', 'Appl. Phys', 'JAN 29', '2018', '112', '5', '', '', '', '', '', '051905', '10.1063/1.5019629', '', '4', '', 'Physi', 'Physi', 'FU7SS', 'WOS:0', 1, 0),
(400, '', 'B', 'Jimenez-Villacorta, F; Lewis, LH;', 'F. Jimenez-Villacorta; L.H. Lewis', '', '', '', 'J. M. Gonzalez', 'Advanced Permanent Magnetic Materials', 'Nanomagnetism', '', '', '', '', '', '', '', '', '', '', '	Permanent, or hard, magnets deliver high magnetic flux combined with high stability against demagnetization. These properties render them essential in modern life: they are key components in efficient motors and electric machines and are integral in energy harvesting and conversion, power generation, sensors and in a plethora of automation-based devices. Permanent magnets are also highlighted as paradigmatic examples of the close relationship between basic research industry and technological implementation, as basic research advances may be directly transitioned to realization of better magnets with enhanced technical performance.  \r\n	Throughout the 20th century, researchers have achieved advances (sometimes disruptive, sometimes just incremental) in diversification and improvement of candidates for numerous permanent magnetic applications. However, earlier researchers did not have the analytical probes and tools that are available today. In the last few years, recent insights derived from advanced tools, design of nanostructured magnets with controlled average crystallite size and orientation, optimized intergranular phase character and directed engineering of intrinsic features via atomic substitution will foster the realization of new materials that may be processed into the next generation of advanced permanent magnets. \r\n	This chapter is organized as follows: in the first section, concepts and tools utilized by researchers to develop, tailor and enhance the performance of permanent magnetic materials are presented; in the second section, an up-to-date report of materials synthesized and processed in diverse manners for development of the next generation of permanent magnets is described, with special attention devoted to technical achievements obtained on nanostructured magnets.	\r\n\r\n	\r\n\r\n	', '', '', '', '', '', '', '', 0, 0, 'One Central Press', 'Manchester', '', '', '978-1-910086-04-9', '', '', '', '2014', '', '', '', '', '', '160', '189', '', '', '', '', '', '', '', '', '', 1, 0),
(401, '', 'J', 'Bigall, NC;Dilena, E;Dorfs, D;Beoutis, ML;Pugliese, G;Wilhelm, C;Gazeau, F;Khan, AA;Bittner, AM;Garcia, MA;Garcia-Hernandez, M;Manna, L;Pellegrino, T;', 'Bigall, Nadja C.; Dilena, Enrico; Dorfs, Dirk; Beoutis, Marie-Lys; Pugliese, Giammarino; Wilhelm, Claire; Gazeau, Florence; Khan, Abid A.; Bittner, Alexander M.; Garcia, Miguel A.; Garcia-Hernandez, Mar; Manna, Liberato; Pellegrino, Teresa', '', '', '', '', 'Hollow Iron Oxide Nanoparticles in Polymer Nanobeads as MRI Contrast Agents', 'JOURNAL OF PHYSICAL CHEMISTRY C', '', '', 'English', 'Article', '', '', '', '', '', '', 'Magnetic nanobeads are synthesized by coprecipitation of hollow iron oxide nanoparticles and an amphiphilic polymer. The resulting nanobeads can be tuned in diameter and nanoparticle content. X-ray absorption near-edge structure (XANES) spectroscopy and superconducting quantum interferometer device (SQUID) characterization of the nanobeads reveal that they exhibit an increased effective magnetic anisotropy as compared to the individual nanoparticles, despite that no structural changes of the particles had occurred during the embedding process into the polymer. The spinspin relaxation times of the pristine hollow nanoparticles and of the final magnetic nanobeads reveal a high R-2 relaxivity of 206 s(-1) mM(-1) for the magnetic nanobeads. This result should enable their application as negative contrast enhancing agents in magnetic resonance imaging.', '[Bigall, Nadja C.; Dilena, Enrico; Dorfs, Dirk; Pugliese, Giammarino; Manna, Liberato; Pellegrino, Teresa] Ist Italian Tecnol, I-16163 Genoa, Italy; [', 'Pellegrino, T (reprint author), Ist Italian Tecnol, Via Morego 30, I-16163 Genoa, Italy.', 'teresa.pellegrino@iit.it', 'European project Magnifyco [NMP4-SL-2009-228622]; Italian AIRC project [14527]; EU-ITN network Mag(net)icFun [PITN-GA-2012-290248]; Italian FIRB proje', 'We are grateful for financial support from the European project Magnifyco (contract NMP4-SL-2009-228622), by the Italian AIRC project (contract no. 14', 'Ai H, 2005, ADV MATER, V17, P1949, DOI 10.1002/adma.200401904; Arbuzova TI, 1998, PHYS SOLID STATE+, V40, P1702, DOI 10.1134/1.1130638; Arosio P, 2013', '49', 0, 0, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '1932-7447', '', 'J PHYS CHE', 'J. Phys. C', 'MAR 19', '2015', '119', '11', '', '', '', '6246', '6253', '', '10.1021/jp508951t', '', '8', '', 'Chemi', 'Chemi', 'CE1FP', 'WOS:0', 1, 0),
(477, '', 'J', 'Rioboo, RJJ;Climent-Pascual, E;Diez-Betriu, X;Jimenez-Villacorta, F;Prieto, C;de Andres, A;', 'Jimenez Rioboo, Rafael J.; Climent-Pascual, Esteban; Diez-Betriu, Xavier; Jimenez-Villacorta, Felix; Prieto, Carlos; de Andres, Alicia', '', '', '', '', 'Elastic constants of graphene oxide few-layer films: correlations with interlayer stacking and bonding', 'JOURNAL OF MATERIALS CHEMISTRY C', '', '', 'English', 'Article', '', '', '', '', '', '', 'We propose a strategy to study the elastic properties of extremely thin graphene oxide (GO) films using Brillouin spectroscopy. The dependence of the surface acoustic wave of a gold capping layer on the structural, chemical and morphological changes occurring to the underneath GO film with temperature is reported and analyzed. At room temperature the shear constant c(44) is similar to 17 GPa and hardens up to 28 GPa at 100 degrees C due to the partial elimination of embedded water layers and to interlayer distance shrinking. At 200 degrees C the almost complete elimination of water induces layer stacking disorder, further GO-GO distance reduction and a significant increase of all elastic constants. The in-plane constants harden due to the partial restoration of the sp(2) C network (c(11): from 268 to 620 GPa) and the out of plane constants harden due to the H bonds that now directly connect the neighbouring GO layers (c(44) approximate to 80 GPa). The obtained Young''s moduli are significantly higher than those reported for GO paper because the ultra-thin GO films are highly ordered and there is no macroscopic applied strain during the measurement. The results obtained here are associated with the intrinsic properties of GO as in-plane and inter-layer bonding.', '[Jimenez Rioboo, Rafael J.; Climent-Pascual, Esteban; Diez-Betriu, Xavier; Jimenez-Villacorta, Felix; Prieto, Carlos; de Andres, Alicia] CSIC, Inst Ci', 'de Andres, A (reprint author), CSIC, Inst Ciencia Mat Madrid, Plaza Murillo 2, E-28049 Madrid, Spain.', 'ada@icmm.csic.es', 'FPI scholarship from Spanish MINECO; Spanish MINECO [MAT2012-37276-C03-01]; Comunidad de Madrid [S2013/MIT-2740 (PHAMA_2.0-CM)]; European Union [60439', 'X.D. acknowledges a FPI scholarship from Spanish MINECO. We thank R. Menendez (INCAR-CSIC) for providing the GO suspension. The research leading to th', '', '31', 0, 0, 'ROYAL SOC CHEMISTRY', 'CAMBRIDGE', 'THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND', '2050-7526', '', 'J MATER CH', 'J. Mater. ', '', '2015', '3', '19', '', '', '', '4868', '4875', '', '10.1039/c4tc02883j', '', '8', '', 'Mater', 'Mater', 'CH7IN', 'WOS:0', 1, 1),
(403, '', 'J', 'Ferrari, AC;Bonaccorso, F;Fal''ko, V;Novoselov, KS;Roche, S;Boggild, P;Borini, S;Koppens, FHL;Palermo, V;Pugno, N;Garrido, JA;Sordan, R;Bianco, A;Ballerini, L;Prato, M;Lidorikis, E;Kivioja, J;Marinelli, C;Ryhanen, T;Morpurgo, A;Coleman, JN;Nicolosi, V', 'Ferrari, Andrea C.; Bonaccorso, Francesco; Fal''ko, Vladimir; Novoselov, Konstantin S.; Roche, Stephan; Boggild, Peter; Borini, Stefano; Koppens, Frank H. L.; Palermo, Vincenzo; Pugno, Nicola; Garrido, Jose A.; Sordan, Roman; Bianco, Alberto; Ballerin', '', '', '', '', 'Science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems', 'NANOSCALE', '', '', 'English', 'Review', '', '', '', '', '', '', 'We present the science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems, targeting an evolution in technology, that might lead to impacts and benefits reaching into most areas of society. This roadmap was developed within the framework of the European Graphene Flagship and outlines the main targets and research areas as best understood at the start of this ambitious project. We provide an overview of the key aspects of graphene and related materials (GRMs), ranging from fundamental research challenges to a variety of applications in a large number of sectors, highlighting the steps necessary to take GRMs from a state of raw potential to a point where they might revolutionize multiple industries. We also define an extensive list of acronyms in an effort to standardize the nomenclature in this emerging field.', '[Ferrari, Andrea C.; Bonaccorso, Francesco; Barbone, Matteo; Sun, Zhipei] Univ Cambridge, Cambridge Graphene Ctr, Cambridge CB3 0FA, England; [Bonacco', 'Ferrari, AC (reprint author), Univ Cambridge, Cambridge Graphene Ctr, Cambridge CB3 0FA, England.', 'acf26@eng.cam.ac.uk', 'EC under the Graphene Flagship Pilot; EC under the Graphene Flagship [604391]', 'We acknowledge useful discussions with A. K. Geim, K. von Klitzing, S. Haque, C. Kerr, R. Phaal, N. Athanassopoulou, R. S. Ruoff, G. Yu, M. Stoller, P', 'Abanin DA, 2011, SCIENCE, V332, P328, DOI 10.1126/science.1199595; Abbas A, 2011, BIOSENS BIOELECTRON, V26, P1815, DOI 10.1016/j.bios.2010.09.030; ', '', 0, 0, '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 0, 0),
(404, '', '0', '2257;', 'CAMBRIDGE', '1', '2040-3364', 'ROYAL SOC CHEMISTRY', '1', '2040-3372', '', 'NANOSCALE', 'Nanoscale', '', '2015', '7', '11', '', '', '', '', '4810', '', '10.1039/c4nr01600a', '', 'Chemistry; Science & Technology - Other Topics; Materials Science; Physics', 'CD4OA', 'WOS:000351061700001', '25707682', 0, 0, '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 0, 0),
(405, '', 'J', 'Galvis, JA;Herrera, E;Guillamon, I;Azpeitia, J;Luccas, RF;Munuera, C;Cuenca, M;Higuera, JA;Diaz, N;Pazos, M;Garcia-Hernandez, M;Buendia, A;Vieira, S;Suderow, H;', 'Galvis, J. A.; Herrera, E.; Guillamon, I.; Azpeitia, J.; Luccas, R. F.; Munuera, C.; Cuenca, M.; Higuera, J. A.; Diaz, N.; Pazos, M.; Garcia-Hernandez, M.; Buendia, A.; Vieira, S.; Suderow, H.', '', '', '', '', 'Three axis vector magnet set-up for cryogenic scanning probe microscopy', 'REVIEW OF SCIENTIFIC INSTRUMENTS', '', '', 'English', 'Article', '', '', '', '', '', '', 'We describe a three axis vector magnet system for cryogenic scanning probe microscopy measurements. We discuss the magnet support system and the power supply, consisting of a compact three way 100 A current source. We obtain tilted magnetic fields in all directions with maximum value of 5T along z-axis and of 1.2T for XY-plane magnetic fields. We describe a scanning tunneling microscopy-spectroscopy (STM-STS) set-up, operating in a dilution refrigerator, which includes a new high voltage ultralow noise piezodrive electronics and discuss the noise level due to vibrations. STM images and STS maps show atomic resolution and the tilted vortex lattice at 150 mK in the superconductor beta-Bi2Pd. We observe a strongly elongated hexagonal lattice, which corresponds to the projection of the tilted hexagonal vortex lattice on the surface. We also discuss Magnetic Force Microscopy images in a variable temperature insert. (C) 2015 AIP Publishing LLC.', '[Galvis, J. A.; Herrera, E.; Guillamon, I.; Buendia, A.; Vieira, S.; Suderow, H.] Univ Autonoma Madrid, Fac Ciencias, Condensed Matter Phys Ctr IFIMAC', 'Galvis, JA (reprint author), Univ Autonoma Madrid, Fac Ciencias, Condensed Matter Phys Ctr IFIMAC, Lab Bajas Temp,Dept Fis Mat Condensada,Inst Cienc, ', '', 'Convocatoria Doctorados en el Exterior [568-2012 COLCIENCIAS]; Spanish MINECO [FIS2011-23488, MAT2011-27470-C02-02, CSD2009-00013]; Comunidad de Madri', 'This work was supported by Convocatoria Doctorados en el Exterior 568-2012 COLCIENCIAS, the Spanish MINECO (FIS2011-23488, MAT2011-27470-C02-02, CSD20', 'Assig M, 2013, REV SCI INSTRUM, V84, DOI 10.1063/1.4793793; CAMPBELL LJ, 1988, PHYS REV B, V38, P2439, DOI 10.1103/PhysRevB.38.2439; Galvis JA, 2013, ', '22', 0, 0, 'AMER INST PHYSICS', 'MELVILLE', '1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA', '0034-6748', '', 'REV SCI IN', 'Rev. Sci. ', 'JAN', '2015', '86', '1', '', '', '', '', '', '013706', '10.1063/1.4905531', '', '8', '', 'Instr', 'Instr', 'CA7AF', 'WOS:0', 0, 0),
(406, '', 'J', 'Ribeiro, LNM;Alcantara, ACS;Darder, M;Aranda, P;Herrmann, PSP;Araujo-Moreira, FM;Garcia-Hernandez, M;Ruiz-Hitzky, E;', 'Ribeiro, Ligia N. M.; Alcantara, Ana C. S.; Darder, Margarita; Aranda, Pilar; Herrmann, Paulo S. P.; Araujo-Moreira, Fernando M.; Garcia-Hernandez, Mar; Ruiz-Hitzky, Eduardo', '', '', '', '', 'Bionanocomposites containing magnetic graphite as potential systems for drug delivery', 'INTERNATIONAL JOURNAL OF PHARMACEUTICS', '', '', 'English', 'Article', '', '', '', '', '', 'Bionanocomposites; Magnetic graphite; Layered double hydroxides; Drug delivery; Alginate; Ibuprofen; Controlled release', 'New magnetic bio-hybrid matrices for potential application in drug delivery are developed from the assembly of the biopolymer alginate and magnetic graphite nanoparticles. Ibuprofen (IBU) intercalated in a Mg-Al layered double hydroxide (LDH) was chosen as a model drug delivery system (DDS) to be incorporated as third component of the magnetic bionanocomposite DDS. For comparative purposes DDS based on the incorporation of pure IBU in the magnetic bio-hybrid matrices were also studied. All the resulting magnetic bionanocomposites were processed as beads and films and characterized by different techniques with the aim to elucidate the role of the magnetic graphite on the systems, as well as that of the inorganic brucite-like layers in the drug-loaded LDH. In this way, the influence of both inorganic components on the mechanical properties, the water uptake ability, and the kinetics of the drug release from these magnetic systems were determined. In addition, the possibility of modulating the levels of IBU release by stimulating the bionanocomposites with an external magnetic field was also evaluated in in vitro assays. (C) 2014 Elsevier B.V. All rights reserved.', '[Ribeiro, Ligia N. M.; Alcantara, Ana C. S.; Darder, Margarita; Aranda, Pilar; Garcia-Hernandez, Mar; Ruiz-Hitzky, Eduardo] CSIC, Inst Ciencia Mat Mad', 'Ruiz-Hitzky, E (reprint author), CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain.', 'eduardo@icmm.csic.es', 'CICYT, Spain [MAT2012-31759]; EU COST Action [MP1202]; CAPES (Brazil); Brazilian agency FAPESP; Brazilian agency CAPES; Brazilian agency CNPq', 'This work was supported by the CICYT, Spain (project MAT2012-31759) and the EU COST Action MP1202. L.N.M.R. acknowledges the CAPES (Brazil) for her fe', 'Aisawa S, 2004, J SOLID STATE CHEM, V177, P3987, DOI 10.1016/j.jssc.2004.07.024; Alcantara ACS, 2010, J MATER CHEM, V20, P9495, DOI 10.1039/c0jm01211d', '63', 0, 0, 'ELSEVIER SCIENCE BV', 'AMSTERDAM', 'PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS', '0378-5173', '', 'INT J PHAR', 'Int. J. Ph', 'DEC 30', '2014', '477', '1-2', '', '', '', '553', '563', '', '10.1016/j.ijpharm.2014.10.033', '', '11', '', 'Pharm', 'Pharm', 'AY5PG', 'WOS:0', 0, 0),
(407, '', 'J', 'Quesada, A;Rubio-Marcos, F;Marco, JF;Mompean, FJ;Garcia-Hernandez, M;Fernandez, JF;', 'Quesada, A.; Rubio-Marcos, F.; Marco, J. F.; Mompean, F. J.; Garcia-Hernandez, M.; Fernandez, J. F.', '', '', '', '', 'On the origin of remanence enhancement in exchange-uncoupled CoFe2O4-based composites', 'APPLIED PHYSICS LETTERS', '', '', 'English', 'Article', '', '', '', '', '', '', 'Abundant efforts are being devoted to the production of nanostructured composites based on ferrites where the exchange-spring mechanism yields larger energy products. However, experimental results occasionally contradict the predictions, and the origin of the phenomenology is not always thoroughly understood. Magnetic properties may eventually evolve in trends similar to that of exchange-spring magnets due to structural changes unrelated to exchange-coupling mechanisms at hard/soft interfaces. Thus, the evaluation of the possible sources of magnetic improvement is pivotal in determining and optimizing the extent of exchange-coupling in spring magnets. Here, we report the observation of remanence improvement and single-phase reversal behavior at room-temperature in CoFe2O4/FeCo composites, where the hard and soft phases are predominantly uncoupled. The results are explained in terms of the temperature evolution of the individual properties of CoFe2O4. Causes for the observation of single-phase magnetization reversal in exchange-uncoupled systems are discussed. Our results indicate that these type of phenomena must be taken into account in order to thoroughly understand the optimization required to improve the magnetic performance of CoFe2O4-based composites. (C) 2014 AIP Publishing LLC.', '[Quesada, A.; Rubio-Marcos, F.; Fernandez, J. F.] CSIC, Inst Ceram & Vidrio, E-28049 Madrid, Spain; [Marco, J. F.] CSIC, Inst Quim Fis Rocasolano, E-2', 'Quesada, A (reprint author), CSIC, Inst Ceram & Vidrio, Plaza Murillo 2, E-28049 Madrid, Spain.', '', 'European Comission [310516]; Spanish Ministerio de Economia y Competitividad [MAT2013-48009-C4-1-P, MAT2011-27470-C02-02, MAT2012-38045-C04-01]; CSIC ', 'The authors would like to thank financial support from the European Comission through the project NANOPYME FP7-NMP-2012-SMALL-6 NANOPYME (No. 310516),', 'DEASSISOLIMPIOC.F, 2008, MAGN IEEE TRANS, V44, P4235; Jiang JS, 2004, APPL PHYS LETT, V85, P5293, DOI 10.1063/1.1828225; Junior AF, 2007, J APPL PHYS,', '23', 0, 0, 'AMER INST PHYSICS', 'MELVILLE', 'CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA', '0003-6951', '', 'APPL PHYS ', 'Appl. Phys', 'NOV 17', '2014', '105', '20', '', '', '', '', '', '', '10.1063/1.4902351', '', '5', '', 'Physi', 'Physi', 'AU3KZ', 'WOS:0', 0, 0),
(408, '', 'J', 'Llamosa, D;Ruano, M;Martinez, L;Mayoral, A;Roman, E;Garcia-Hernandez, M;Huttel, Y;', 'Llamosa, D.; Ruano, M.; Martinez, L.; Mayoral, A.; Roman, E.; Garcia-Hernandez, M.; Huttel, Y.', '', '', '', '', 'The ultimate step towards a tailored engineering of core@shell and core@shell@shell nanoparticles', 'NANOSCALE', '', '', 'English', 'Article', '', '', '', '', '', '', 'Complex core@shell and core@shelicashell nanoparticles are systems that combine the functionalities of the inner core and outer shell materials together with new physico-chemical properties originated by their low (nano) dimensionality. Such nanoparticles are of prime importance in the fast growing field of nanotechnology as building blocks for more sophisticated systems and a plethora of applictions. Here, it is shown that although conceptually simple a modified gas aggregation approach allows the one-step generation of well-controlled complex nanoparticles. In particular, it is demonstrated that the atoms of the core and the shell of the nanoparticles can be easily inverted, avoiding intrinsic constraints of chemical methods.', '[Llamosa, D.; Ruano, M.; Martinez, L.; Roman, E.; Garcia-Hernandez, M.; Huttel, Y.] CSIC, Inst Ciencia Mat Madrid, Madrid 28049, Spain; [Mayoral, A.] ', 'Huttel, Y (reprint author), CSIC, Inst Ciencia Mat Madrid, C Sor Juana Ines de la Cruz 3, Madrid 28049, Spain.', 'huttel@icmm.csic.es', 'Spanish Ministerio de Ciencia e Innovacion [MAT2011-29194-C02-02, MAT201127470-C02-02, CSD2007-00041, CSD200900013]; Ministerio de Ciencia e Innovacio', 'Work was supported by the Spanish Ministerio de Ciencia e Innovacion under projects MAT2011-29194-C02-02, MAT201127470-0O2-02, CSD2007-00041 (NANOSELE', 'Baer DR, 2013, J VAC SCI TECHNOL A, V31, DOI 10.1116/1.4818423; Benelmekki M, 2014, NANOSCALE, V6, P3532, DOI 10.1039/c3nr06114k; BILLAS IML, 1993, PH', '23', 0, 0, 'ROYAL SOC CHEMISTRY', 'CAMBRIDGE', 'THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND', '2040-3364', '', 'NANOSCALE', 'Nanoscale', 'NOV', '2014', '6', '22', '', '', '', '13483', '13486', '', '10.1039/c4nr02913e', '', '4', '', 'Chemi', 'Chemi', 'AT3LQ', 'WOS:0', 0, 0),
(409, '', 'J', 'Vinas, R;Alvarez-Serrano, I;Lopez, ML;Pico, C;Veiga, ML;Mompean, F;Garcia-Hernandez, M;', 'Vinas, R.; Alvarez-Serrano, I.; Lopez, M. L.; Pico, C.; Veiga, M. L.; Mompean, F.; Garcia-Hernandez, M.', '', '', '', '', 'Influence of particle sizes on the electronic behavior of ZnxCo1- xFe(2)O(4) spinels (x=0.2, 0.3)', 'JOURNAL OF ALLOYS AND COMPOUNDS', '', '', 'English', 'Article', '', '', '', '', '', 'Chemical synthesis; X-ray diffraction; Dielectric response; Magnetic measurements', 'The effect of composition and particle size on the electrical and magnetic behavior of ZnxCo1 xFe2O4 spinels (x = 0.2 and 0.3) has been studied. Powdered samples of these ferrites have been synthetized by the liquid mix technique and hydrothermal method (in sub and supercritical conditions), leading to average particle sizes of ca. 50 and 10 nm, respectively. They have been characterized by means of X-ray diffraction, Thermogravimetric analysis, Energy-Dispersive X-ray Spectroscopy and impedance and magnetic measurements. Permittivity values up to ca. 500 were registered at 375 K, which remained almost constant at moderate frequencies, between 103 and 106 Hz. Stabilization of polarization phenomena is very sensitive to grain size and composition. Dielectric behavior evolves to a relaxor ferroelectric response when grain size becomes nanometric and, particularly, when the sample shows high monodispersion. The conduction mechanism and type of majority charge carriers have been established from Seebeck measurements. The x = 0.3 sample, prepared in supercritical water for the first time, exhibits homogeneous particle size distribution, superparamagnetic behavior and Curie temperature lower than those corresponding to similar microsized samples. The electronic response of the ferrites obtained in supercritical conditions is interpreted considering the possible short scale polarization of nanodomains. (c) 2014 Elsevier B. V. All rights reserved.', '[Vinas, R.; Alvarez-Serrano, I.; Lopez, M. L.; Pico, C.; Veiga, M. L.] Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Inorgan, E-28040 Madrid, ', 'Alvarez-Serrano, I (reprint author), Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Inorgan, Avda Complutense S-N, E-28040 Madrid, Spain.', 'ias@quim.ucm.es', 'Spanish Ministerio de Ciencia e Innovacion [MAT2010-20117, MAT2011-27470-C02-02, CSD2009-00013]', 'Authors are grateful to the CAI centers of the UCM (XRD and electron microscopy) and financial support from Spanish Ministerio de Ciencia e Innovacion', 'Alvarez-Serrano I, 2011, ADV MATER, V23, P5237, DOI 10.1002/adma.201101727; Anshu Sharma, 2012, INT J ADV ENG TECH, V5, P544; Ben Tahar L, 2012, MATER', '35', 0, 0, 'ELSEVIER SCIENCE SA', 'LAUSANNE', 'PO BOX 564, 1001 LAUSANNE, SWITZERLAND', '0925-8388', '', 'J ALLOY CO', 'J. Alloy. ', 'JUL 15', '2014', '601', '', '', '', '', '130', '139', '', '10.1016/j.jallcom.2014.02.016', '', '10', '', 'Chemi', 'Chemi', 'AE9GG', 'WOS:0', 0, 0),
(410, '', 'J', 'Biskup, N;Alvarez-Serrano, I;Veiga, M;Rivera-Calzada, A;Garcia-Hernandez, M;Pennycook, SJ;Varela, M;', 'Biskup, Neven; Alvarez-Serrano, Inmaculada; Veiga, Maria; Rivera-Calzada, Alberto; Garcia-Hernandez, Mar; Pennycook, Stephen J.; Varela, Maria', '', '', '', '', 'Mapping Chemical Disorder and Ferroelectric Distortions in the Double Perovskite Compound Sr2-xGdxMnTiO6 by Atomic Resolution Electron Microscopy and ', 'MICROSCOPY AND MICROANALYSIS', '', '', 'English', 'Article', '', '', '', '', '', 'double perovskite; electroresistance; ferroelectric displacement; atomic resolution electron microscopy; EELS', 'In this work we report a study of the chemical and structural order of the double perovskite compound Sr2-xGdxMnTiO6 for compositions x = 0, 0.25, 0.5, 0.75, and 1. A noticeable disorder at the B-site in the Mn and Ti sublattice is detected at the atomic scale by electron energy-loss spectroscopy for all x values, resulting in Mn-rich and Ti-rich regions. For x >= 0.75, the cubic unit cell doubles and lowers its symmetry because of structural rearrangements associated with a giant ferroelectric displacement of the perovskite B-site cation. We discuss this finding in the light of the large electroresistance observed in Sr2-xGdxMnTiO6, x >= 0.75.', '[Biskup, Neven; Rivera-Calzada, Alberto; Varela, Maria] Univ Complutense Madrid, Dept Fis Aplicada 3, E-28040 Madrid, Spain; [Biskup, Neven; Rivera-Ca', 'Biskup, N (reprint author), Univ Complutense Madrid, Dept Fis Aplicada 3, E-28040 Madrid, Spain.', 'biskupneven@gmail.com', 'ORNL''s Center for Nanophase Materials Sciences (CNMS) - Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy;', 'The authors acknowledge Andrew Lupini for fruitful discussions and for providing the script with the Hanning filtering routine. Research at ORNL US De', 'ABBATE M, 1991, PHYS REV B, V44, P5419, DOI 10.1103/PhysRevB.44.5419; Akinaga H, 2010, P IEEE, V98, P2237, DOI 10.1109/JPROC.2010.2070830; Alvarez-Ser', '18', 0, 0, 'CAMBRIDGE UNIV PRESS', 'NEW YORK', '32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA', '1431-9276', '', 'MICROSC MI', 'Microsc. m', 'JUN', '2014', '20', '3', '', '', '', '731', '739', '', '10.1017/S1431927614000506', '', '9', '', 'Mater', 'Mater', 'AL5FK', 'WOS:0', 0, 0),
(411, '', 'J', 'Sirvent, P;Berganza, E;Aragon, AM;Bollero, A;Moure, A;Garcia-Hernandez, M;Marin, P;Fernandez, JF;Quesada, A;', 'Sirvent, P.; Berganza, E.; Aragon, A. M.; Bollero, A.; Moure, A.; Garcia-Hernandez, M.; Marin, P.; Fernandez, J. F.; Quesada, A.', '', '', '', '', 'Effective high-energy ball milling in air of Fe65Co35 alloys', 'JOURNAL OF APPLIED PHYSICS', '', '', 'English', 'Article', '', '', '', '', '', '', 'Fe65Co35 alloys are technologically relevant, especially in magnetic storage and composite permanent magnets, due to the fact that they present higher saturation magnetization per volume than any other material. Out of the various approaches undertaken for its production, mechanical ball milling remains the most common and efficient method, especially considering the large industrial scale of the applications. With the development of cost-efficient processing in mind, the influence of performing the synthesis of the FeCo alloys in air instead of the standard argon atmosphere is studied. The structural and magnetic characterization, along with the study of the oxygen content of the samples, proves that synthesizing FeCo alloys in air produce materials with nearly identical magnetic performance as their argon-milled counterpart, with the oxidation extent of the materials consisting almost exclusively of the oxide passivating layer located at the surface. In addition, no aging effect was observed in the saturation magnetization up to 6 months. It is concluded that the use of argon atmospheres, desiccators and/or glove boxes may be entirely removed from the process without affecting the magnetic properties. (C) 2014 AIP Publishing LLC.', '[Sirvent, P.; Moure, A.; Fernandez, J. F.; Quesada, A.] CSIC, Electroceram Dept, Inst Ceram & Vidrio, Madrid 28049, Spain; [Berganza, E.; Bollero, A.]', 'Quesada, A (reprint author), CSIC, Electroceram Dept, Inst Ceram & Vidrio, Kelsen 5, Madrid 28049, Spain.', 'a.quesada@icv.csic.es', 'European Commission [310516]; Spanish Ministerio de Economia y Competitividad through the Juan de la Cierva program [MAT 2010-21088-C03-01]', 'The authors would like to thank financial support from the European Commission through the Project NANOPYME FP7-NMP-2012-SMALL-6 NANOPYME No. 310516, ', 'Azzaza S, 2006, J PHYS-CONDENS MAT, V18, P7257, DOI 10.1088/0953-8984/18/31/020; BODKER F, 1994, PHYS REV LETT, V72, P282, DOI 10.1103/PhysRevLett.72.', '24', 0, 0, 'AMER INST PHYSICS', 'MELVILLE', 'CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA', '0021-8979', '', 'J APPL PHY', 'J. Appl. P', 'MAY 7', '2014', '115', '17', '', '', '', '', '', '17B505', '10.1063/1.4862220', '', '3', '', 'Physi', 'Physi', 'AG8BO', 'WOS:0', 0, 0),
(412, '', 'J', 'Gonzalez-Jimenez, IN;Torres-Pardo, A;Sanchez-Pelaez, AE;Gutierrez, A;Garcia-Hernandez, M;Gonzalez-Calbet, JM;Parras, M;Varela, A;', 'Gonzalez-Jimenez, Irma N.; Torres-Pardo, Almudena; Sanchez-Pelaez, Ana E.; Gutierrez, Angel; Garcia-Hernandez, Mar; Gonzalez-Calbet, Jose M.; Parras, Marina; Varela, Aurea', '', '', '', '', 'Synthesis of 4H-SrMnO3.0 Nanoparticles from a Molecular Precursor and Their Topotactic Reduction Pathway Identified at Atomic Scale', 'CHEMISTRY OF MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', '', 'Stoichiometric 4H-SrMnO3.0 nanoparticles have been synthesized from thermal decomposition of a new molecular heterometallic precursor [SrMn(edta)-(H2(O))(5)]center dot 3/2H(2)O whose crystal structure has been solved by single crystal X-ray diffraction. From this precursor, highly homogeneous 4H-SrMnO3.0 nanoparticles, with average particle size of 70 nm, are obtained. The agglomeration of these nanoparticles maintains the sheet-assembling morphology of the metal organic compound. Local structural information, provided by atomically resolved microscopy techniques, shows that 4H-SrMnO3.0 nanoparticles exhibit the same general structural features as the bulk material, although structural disorder, due to edge dislocations, is observed. The nanometric particle size enables a topotactic reduction process at low temperature stabilizing a metastable 4H-SrMnO2.82 phase. The oxygen deficiency is accommodated through extra cubic layers breaking the ...chch... 4H-sequence. These defect areas are Mn3+ rich, as evidenced by high energy resolution EELS data. Magnetic characterization of nano-SrMnO3.0 shows significant variations with respect to the bulk material. Besides the dominant antiferromagnetic interactions, a weak ferromagnetic contribution as well as exchange bias and a glassy-like component are present. After the reduction process, the stabilization of Mn3+ in the 4H-structure gives rise to magnetic anomalies in the 40-60 K temperature range. The origin of such magnetic features is discussed.', '[Gonzalez-Jimenez, Irma N.; Torres-Pardo, Almudena; Sanchez-Pelaez, Ana E.; Gutierrez, Angel; Gonzalez-Calbet, Jose M.; Parras, Marina; Varela, Aurea]', 'Varela, A (reprint author), Univ Complutense Madrid, Dept Quim Inorgan, Fac CC Quim, E-28040 Madrid, Spain.', 'aurea@ucm.es', 'Moncloa Campus of International Excellence;  [CSD2009-00013];  [MAT2011-23068];  [MAT2011-27470-C02-02]', 'Financial support through research projects CSD2009-00013, MAT2011-23068, and MAT2011-27470-C02-02 is acknowledged. ATP thanks Moncloa Campus of Inter', 'Adkin JJ, 2006, J SOLID STATE CHEM, V179, P70, DOI 10.1016/j.jssc.2005.09.046; Adkin JJ, 2008, INORG CHEM, V47, P10959, DOI 10.1021/ic801185z; BATTLE ', '38', 0, 0, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0897-4756', '', 'CHEM MATER', 'Chem. Mat.', 'APR 8', '2014', '26', '7', '', '', '', '2256', '2265', '', '10.1021/cm500068y', '', '10', '', 'Chemi', 'Chemi', 'AF2WD', 'WOS:0', 0, 0),
(413, '', 'J', 'Guglieri, C;Cespedes, E;Espinosa, A;Laguna-Marco, MA;Carmona, N;Takeda, Y;Okane, T;Nakamura, T;Garcia-Hernandez, M;Garcia, MA;Chaboy, J;', 'Guglieri, Clara; Cespedes, Eva; Espinosa, Ana; Angeles Laguna-Marco, Maria; Carmona, Noemi; Takeda, Yukiharu; Okane, Tetsuo; Nakamura, Tetsuya; Garcia-Hernandez, Mar; Angel Garcia, Miguel; Chaboy, Jesus', '', '', '', '', 'dEvidence of Oxygen Ferromagnetism in ZnO Based Materials', 'ADVANCED FUNCTIONAL MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'X-ray magnetic circular dichroism; X-ray absorption spectroscopy; oxide surfaces; magnetic semiconductors; surface magnetism', 'Discoveries of room-temperature ferromagnetism (RTFM) in semiconductors hold great promise in future spintronics technologies. Unfortunately, this ferromagnetism remains poorly understood and the debate concerning the nature, carrier-mediated versus defect-mediated, of this ferromagnetism in semiconducting oxides is still open. Here, by using X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD), it is demonstrated that the oxygen ions have a ferromagnetic response in different ZnO-based compounds showing RTFM behavior: ZnO nanoparticles capped with organic molecules and ZnO/ZnS heterostructures. These results demonstrate the intrinsic occurrence of RTFM in these systems, and point out that it is not related to the metallic cation but it relays on the conduction band of the semiconductor.', '[Guglieri, Clara; Angeles Laguna-Marco, Maria; Chaboy, Jesus] Univ Zaragoza, Consejo Super Invest Cient, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Sp', 'Guglieri, C (reprint author), Univ Zaragoza, Consejo Super Invest Cient, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain.', 'jchaboy@unizar.es', 'Madrid Government project NANOBIOMAGNET [S2009/MAT-1726]; Aragon DGA NETOSHIMA grant; U. S. Department of Energy, Office of Science, Office of Basic E', 'This work was partially supported by Spanish MAT2011-27573-C04-04, MAT2010-16022, CSD2009-00013, MAT2011-27470-C02-02, MAT2010-09346-E, the Madrid Gov', 'Barla A, 2007, PHYS REV B, V76, DOI 10.1103/PhysRevB.76.125201; Benfatto M, 2001, J SYNCHROTRON RADIAT, V8, P1087, DOI 10.1107/S0909049501006422; Carm', '48', 5, 5, 'WILEY-V C H VERLAG GMBH', 'WEINHEIM', 'BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY', '1616-301X', '', 'ADV FUNCT ', 'Adv. Funct', 'APR', '2014', '24', '14', '', '', '', '2094', '2100', '', '10.1002/adfm.201303087', '', '7', '', 'Chemi', 'Chemi', 'AE2NG', 'WOS:0', 1, 0),
(414, '', 'J', 'Castro, M;Cuerno, R;Garcia-Hernandez, MM;Vazquez, L;', 'Castro, M.; Cuerno, R.; Garcia-Hernandez, M. M.; Vazquez, L.', '', '', '', '', 'Pattern-Wavelength Coarsening from Topological Dynamics in Silicon Nanofoams', 'PHYSICAL REVIEW LETTERS', '', '', 'English', 'Article', '', '', '', '', '', '', 'We report the experimental observation of a submicron cellular structure on the surface of silicon targets eroded by an ion plasma. Analysis by atomic force microscopy allows us to assess the time evolution and show that the system can be described quantitatively by the convective Cahn-Hilliard equation, found in the study of domain coarsening for a large class of driven systems. The space-filling trait of the ensuing pattern relates it to evolving foams. Through this connection, we are actually able to derive the coarsening law for the pattern wavelength from the nontrivial topological dynamics of the cellular structure. Thus, the study of the topological properties of patterns in nonvariational spatially extended systems emerges as complementary to morphological approaches to their challenging coarsening properties.', '[Castro, M.] Univ Pontificia Comillas, GISC, E-28015 Madrid, Spain; [Castro, M.] Univ Pontificia Comillas, DNL, Escuela Trc Sup Ingn ICAI, E-28015 Mad', 'Castro, M (reprint author), Univ Pontificia Comillas, GISC, E-28015 Madrid, Spain.', '', 'MICINN; MEC (Spain) [FIS2009-12964-C05-01, FIS2009-12964-C05-03, FIS2012-38866-C05-01, FIS2012-38866-C05-01-05, MAT2011-27470-C02-02, CSD2009-00013]', 'We thank R. Gago for discussions. This work has been partially supported by MICINN and MEC (Spain) via Grants No. FIS2009-12964-C05-01, No. FIS2009-12', 'Andreotti B, 2009, NATURE, V457, P1120, DOI 10.1038/nature07787; Arenzon JJ, 2007, PHYS REV LETT, V98, DOI 10.1103/PhysRevLett.98.145701; Bevington P.', '41', 0, 0, 'AMER PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '0031-9007', '', 'PHYS REV L', 'Phys. Rev.', 'MAR 7', '2014', '112', '9', '', '', '', '', '', '094103', '10.1103/PhysRevLett.112.094103', '', '5', '', 'Physi', 'Physi', 'AC7DW', 'WOS:0', 0, 0),
(415, '', 'J', 'Alguero, M;Ricote, J;Torres, M;Amorin, H;Alberca, A;Iglesias-Freire, O;Nemes, N;Holgado, S;Cervera, M;Piqueras, J;Asenjo, A;Garcia-Hernandez, M;', 'Alguero, Miguel; Ricote, Jesus; Torres, Maria; Amorin, Harvey; Alberca, Aurora; Iglesias-Freire, Oscar; Nemes, Norbert; Holgado, Susana; Cervera, Manuel; Piqueras, Juan; Asenjo, Agustina; Garcia-Hernandez, Mar', '', '', '', '', 'Thin Film Multiferroic Nanocomposites by Ion Implantation', 'ACS APPLIED MATERIALS & INTERFACES', '', '', 'English', 'Article', '', '', '', '', '', 'ion-implantation; magnetoelectric-devices; multiferroic-materials; nanoparticulate-composite; thin-film-technologies', 'Thin film multiferroic nanocomposites might enable a range of potentially disruptive integrated magnetoelectric devices for information storage, spintronics, microwave telecommunications, and magnetic sensing. With this aim, we have investigated ion implantation of magnetic species into ferroelectric single crystal targets as a radically novel approach to prepare film nanoparticulate magnetic-metal ferroelectricoxide composites. These materials are an alternative to multiferroic oxide epitaxial columnar nanostructures that are under intensive research, but whose magnetoelectric response is far from expectations. Here, we unambiguously demonstrate the preparation of such a thin film multiferroic nanocomposite of Co and BaTiO3 by ion implantation of a high dose of the magnetic species, followed by rapid thermal processing under tailored conditions. Results thus constitute a proof of concept for the feasibility of obtaining the materials by this alternative approach. Ion implantation is a standard technique for the microelectronic industry in combination with well-established patterning procedures.', '[Alguero, Miguel; Ricote, Jesus; Torres, Maria; Amorin, Harvey; Alberca, Aurora; Iglesias-Freire, Oscar; Asenjo, Agustina; Garcia-Hernandez, Mar] CSIC', 'Alguero, M (reprint author), CSIC, Inst Ciencia Mat Madrid, Plaza Murillo 2, E-28049 Madrid, Spain.', 'malguero@icmm.csic.es', 'MINECO [MAT2011-23709, MAT2009-07551-E]; EC [227012]', 'Funded by MINECO (formerly MICINN, Spain) through projects MAT2011-23709 and MAT2009-07551-E. Implantations were carried out within the TNA Programme ', 'Alexe M., 2012, NANO LETT, VII, P3202; Bea H, 2008, J PHYS-CONDENS MAT, V20, DOI 10.1088/0953-8984/20/43/434221; Bibes M, 2008, NAT MATER, V7, P425, D', '33', 1, 1, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '1944-8244', '', 'ACS APPL M', 'ACS Appl. ', 'FEB 12', '2014', '6', '3', '', '', '', '1909', '1915', '', '10.1021/am404945m', '', '7', '', 'Nanos', 'Scien', 'AB0OY', 'WOS:0', 0, 0),
(416, '', 'J', 'Mazario, E;Sanchez-Marcos, J;Menendez, N;Herrasti, P;Garcia-Hernandez, M;Munoz-Bonilla, A;', 'Mazario, Eva; Sanchez-Marcos, Jorge; Menendez, Nieves; Herrasti, Pilar; Garcia-Hernandez, Mar; Munoz-Bonilla, Alexandra', '', '', '', '', 'One-pot electrochemical synthesis of polydopamine coated magnetite nanoparticles', 'RSC ADVANCES', '', '', 'English', 'Article', '', '', '', '', '', '', 'Herein a facile and versatile one step synthesis of magnetite nanoparticles coated with polydopamine is described. Magnetite nanoparticles are synthesized electrochemically by electrooxidation of iron in an aqueous medium in the presence of dopamine. The oxidative conditions and alkaline pH involved in the synthesis favor the self-polymerization of dopamine that adheres at the surface of the magnetic nanoparticles in a simultaneous process. It is shown that the size of the magnetite nanoparticles as well as the polydopamine coating can be controlled by varying the synthetic approach that is, adding dopamine at the beginning of the electrosynthesis, in the middle or at the end of the process. The particle size of the core varies between a few nanometers and 25 nm while the shell can reach thicknesses of up to similar to 5 nm. The obtained hybrid nanoparticles were characterized by thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), X-ray diffraction (XRD) and transmission electron microscopy (TEM). In addition, the magnetic measurements of the different obtained materials were carried out showing a variety of magnetic behaviors depending on the synthetic procedure.', '[Mazario, Eva; Sanchez-Marcos, Jorge; Menendez, Nieves; Herrasti, Pilar; Munoz-Bonilla, Alexandra] Univ Autonoma Madrid, Fac Ciencias, Dept Quim Fis A', 'Munoz-Bonilla, A (reprint author), Univ Autonoma Madrid, Fac Ciencias, Dept Quim Fis Aplicada, C Francisco Tom & Valiente 7, E-28049 Madrid, Spain.', 'alexandra.munnoz@uam.es', 'Spanish MINECO [MAT2012-37109-C02-02]; MINECO', 'This work was financially supported by the Spanish MINECO (Project MAT2012-37109-C02-02). A. Munoz-Bonilla gratefully acknowledges the MINECO for her ', 'Alonso J, 2010, PHYS REV B, V82, DOI 10.1103/PhysRevB.82.054406; Black KCL, 2011, CHEM MATER, V23, P1130, DOI 10.1021/cm1024487; Cabrera L, 2008, ELEC', '36', 0, 0, 'ROYAL SOC CHEMISTRY', 'CAMBRIDGE', 'THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND', '2046-2069', '', 'RSC ADV', 'RSC Adv.', '', '2014', '4', '89', '', '', '', '48353', '48361', '', '10.1039/c4ra08065c', '', '9', '', 'Chemi', 'Chemi', 'AR6RC', 'WOS:0', 0, 0),
(417, '', 'J', 'Monti, M;Sanz, M;Oujja, M;Rebollar, E;Castillejo, M;Pedrosa, FJ;Bollero, A;Camarero, J;Cunado, JLF;Nemes, NM;Mompean, FJ;Garcia-Hernandez, M;Nie, S;McCarty, KF;N''Diaye, AT;Chen, G;Schmid, AK;Marco, JF;de la Figuera, J;', 'Monti, Matteo; Sanz, Mikel; Oujja, Mohamed; Rebollar, Esther; Castillejo, Marta; Pedrosa, Francisco J.; Bollero, Alberto; Camarero, Julio; Cunado, Jose Luis F.; Nemes, Norbert M.; Mompean, Federico J.; Garcia-Hernandez, Mar; Nie, Shu; McCarty, Kevin ', '', '', '', '', 'Room temperature in-plane (100) magnetic easy axis for Fe3O4/SrTiO3(001):Nb grown by infrared pulsed laser deposition', 'JOURNAL OF APPLIED PHYSICS', '', '', 'English', 'Article', '', '', '', '', '', '', 'We examine the magnetic easy-axis directions of stoichiometric magnetite films grown on SrTiO3: Nb by infrared pulsed-laser deposition. Spin-polarized low-energy electron microscopy reveals that the individual magnetic domains are magnetized along the in-plane <100> film directions. Magneto-optical Kerr effect measurements show that the maxima of the remanence and coercivity are also along in-plane <100> film directions. This easy-axis orientation differs from bulk magnetite and films prepared by other techniques, establishing that the magnetic anisotropy can be tuned by film growth. (C) 2013 AIP Publishing LLC.', '[Monti, Matteo; Sanz, Mikel; Oujja, Mohamed; Rebollar, Esther; Castillejo, Marta; Marco, Jose F.; de la Figuera, Juan] CSIC, Inst Quim Fis Rocasolano,', 'de la Figuera, J (reprint author), CSIC, Inst Quim Fis Rocasolano, E-28006 Madrid, Spain.', 'juan.delafiguera@iqfr.csic.es', 'MICINN [CTQ2010-15680, MAT2009-14578-C03-01, MAT2011-27470-C02- 02]; MINECO [MAT2012-38045-C04-01, MAT2011-25598]; EU-FP7 NANOPYME [310516]; Office of', 'Authors acknowledge fruitful discussions with Professor M. Ziese. This research was supported by Projects CTQ2010-15680, MAT2009-14578-C03-01 (MICINN)', 'ABE K, 1976, J PHYS SOC JPN, V41, P1894; Alexe M, 2009, ADV MATER, V21, P4452, DOI 10.1002/adma.200901381; Bibes M, 2011, ADV PHYS, V60, P5, DOI 10.10', '53', 3, 3, 'AMER INST PHYSICS', 'MELVILLE', 'CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA', '0021-8979', '', 'J APPL PHY', 'J. Appl. P', 'DEC 14', '2013', '114', '22', '', '', '', '', '', '223902', '10.1063/1.4837656', '', '5', '', 'Physi', 'Physi', '281HI', 'WOS:0', 0, 0),
(418, '', 'J', 'Alonso-Dominguez, D;Alvarez-Serrano, I;Lopez, ML;Veiga, ML;Pico, C;Mompean, F;Garcia-Hernandez, M;Cuello, GJ;', 'Alonso-Dominguez, D.; Alvarez-Serrano, I.; Lopez, M. L.; Veiga, M. L.; Pico, C.; Mompean, F.; Garcia-Hernandez, M.; Cuello, G. J.', '', '', '', '', 'Versatile electronic behavior of the LixMn3-x-yFeyO4 spinels', 'JOURNAL OF ALLOYS AND COMPOUNDS', '', '', 'English', 'Article', '', '', '', '', '', 'Ferrites; Neutron diffraction; Magnetocaloric effect; Dielectric behavior; Li cathodes; Spinel', 'The detailed structural and electronic characterization of microcrystalline powders of new spinels Lix-Mn3-x-yFeyO4 (0.4 <= x <= 1.33; 0 <= y <= 1.30), obtained by the "liquid mix" method, is reported. Compositional characterization was carried out by means of thermogravimetric analysis, energy-dispersive X-ray spectroscopy and electron energy loss spectroscopy, and their structure was refined from neutron and Xray diffraction showing a cubic symmetry between 5 and 550 K, Space Group Fd (3) over barm. However, at temperatures above ca. 950 K, a reversible transformation, probably implying the formation of an ordered vacant phase, has been detected. The magnetic behavior, analyzed from neutron diffraction data and magnetization measurements, is interpreted considering an "incomplete" ferrimagnetic response, due to magnetic frustration in the B sites. Potential applications have been evaluated from the magnetocaloric, electrochemical and dielectric behavior in selected compositional ranges. (C) 2013 Elsevier B.V. All rights', '[Alonso-Dominguez, D.; Alvarez-Serrano, I.; Lopez, M. L.; Veiga, M. L.; Pico, C.] Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Inorgan, E-280', 'Alvarez-Serrano, I (reprint author), Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Inorgan, Avda Complutense S-N, E-28040 Madrid, Spain.', 'ias@quim.ucm.es', 'Spanish Ministerio de Ciencia e Innovacion [MAT2010-20117, MAT2011-27470-C02-02, CSD2009-00013]; CEI Moncloa', 'Authors are grateful to the CAI centers of UCM (XRD and electron microscopy) and financial support from Spanish Ministerio de Ciencia e Innovacion MAT', 'Alvarez-Serrano I, 2011, ADV MATER, V23, P5237, DOI 10.1002/adma.201101727; Amarilla JM, 2009, J POWER SOURCES, V191, P591, DOI 10.1016/j.jpowsour.200', '33', 0, 0, 'ELSEVIER SCIENCE SA', 'LAUSANNE', 'PO BOX 564, 1001 LAUSANNE, SWITZERLAND', '0925-8388', '', 'J ALLOY CO', 'J. Alloy. ', 'NOV 15', '2013', '577', '', '', '', '', '269', '277', '', '10.1016/j.jallcom.2013.05.043', '', '9', '', 'Chemi', 'Chemi', '213TJ', 'WOS:0', 0, 0),
(419, '', 'J', 'Silva, B;Luccas, RF;Nemes, NM;Hanko, J;Osorio, MR;Kulkarni, P;Mompean, F;Garcia-Hernandez, M;Ramos, MA;Vieira, S;Suderow, H;', 'Silva, B.; Luccas, R. F.; Nemes, N. M.; Hanko, J.; Osorio, M. R.; Kulkarni, P.; Mompean, F.; Garcia-Hernandez, M.; Ramos, M. A.; Vieira, S.; Suderow, H.', '', '', '', '', 'Superconductivity and magnetism on flux-grown single crystals of NiBi3', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'We present resistivity, magnetization, and specific-heat measurements on flux-grown single crystals of NiBi3. We find typical behavior of a type-II superconductor, with, however, a sizable magnetic signal in the superconducting phase. There is a hysteretic magnetization characteristic of a ferromagnetic compound. By following the magnetization as a function of temperature, we find a drop at temperatures corresponding to the Curie temperature of ferromagnetic amorphous Ni. Thus, we assign the magnetism in NiBi3 crystals to amorphous Ni impurities.', '[Silva, B.; Luccas, R. F.; Hanko, J.; Osorio, M. R.; Kulkarni, P.; Ramos, M. A.; Vieira, S.; Suderow, H.] Univ Autonoma Madrid, Lab Bajas Temp, Dept F', 'Suderow, H (reprint author), Univ Autonoma Madrid, Lab Bajas Temp, Dept Fis Mat Condensada, Inst Nicolas Cabrera, E-28049 Madrid, Spain.', 'hermann.suderow@uam.es', 'Spanish MINECO [FIS2011-23488, ACI-2009-0905, MAT2011-27470-C02-02, CSD2009-0013]; Comunidad de Madrid through program Nanobiomagnet', 'We acknowledge discussions with A. I. Buzdin and F. Guinea. This work was supported by the Spanish MINECO (Grants No. FIS2011-23488, No. ACI-2009-0905', 'Aoki D, 2001, NATURE, V413, P613, DOI 10.1038/35098048; BLATTER G, 1994, REV MOD PHYS, V66, P1125, DOI 10.1103/RevModPhys.66.1125; Brison JP, 2000, PH', '42', 1, 1, 'AMER PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '1098-0121', '', 'PHYS REV B', 'Phys. Rev.', 'NOV 13', '2013', '88', '18', '', '', '', '', '', '184508', '10.1103/PhysRevB.88.184508', '', '5', '', 'Physi', 'Physi', '254GC', 'WOS:0', 0, 0),
(420, '', 'J', 'Alberca, A;Nemes, NM;Mompean, FJ;Feher, T;Simon, F;Tornos, J;Leon, C;Munuera, C;Kirby, BJ;Fitzsimmons, MR;Hernando, A;Santamaria, J;Garcia-Hernandez, M;', 'Alberca, A.; Nemes, N. M.; Mompean, F. J.; Feher, T.; Simon, F.; Tornos, J.; Leon, C.; Munuera, C.; Kirby, B. J.; Fitzsimmons, M. R.; Hernando, A.; Santamaria, J.; Garcia-Hernandez, M.', '', '', '', '', 'Magnetoelastic coupling in La0.7Ca0.3MnO3/BaTiO3 ultrathin films', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'The magnetism of La0.7Ca0.3MnO3 (LCMO) epitaxial thin films grown on SrTiO3 (STO) and BaTiO3 (BTO) substrates is studied using polarized neutron reflectometry (PNR) and ferromagnetic resonance (FMR) techniques. In LCMO/BTO, PNR reveals a strongly suppressed magnetization of 300 kA/m, equivalent to a magnetic moment of 2 mu B/Mn, throughout the LCMO layer, amounting to half the expected value. The largest suppression occurs near the interface with BTO, with magnetization values of 50 kA/m, equivalent to 0.3 mu B/Mn. FMR is observable at 8.9 GHz only around the [110] crystallographic direction in thin LCMO/BTO. The resonance barely shifts as the applied field is rotated away from [110]. The FMR results are analyzed in terms of magnetoelastic anisotropy and compared to LCMO/STO grown under the same conditions. A two-layer magnetization model is proposed, based on strong out-of-plane anisotropy near the BTO interface and shown to qualitatively explain the main characteristics of the FMR results.', '[Alberca, A.; Mompean, F. J.; Munuera, C.; Garcia-Hernandez, M.] CSIC, Inst Ciencia Mat Madrid, ES-28049 Madrid, Spain; [Nemes, N. M.; Tornos, J.; Leo', 'Alberca, A (reprint author), CSIC, Inst Ciencia Mat Madrid, Sor Juana Ines Cruz 3, ES-28049 Madrid, Spain.', '', 'Spanish Ministry for Science and Innovation [MAT2011-27470-C02-01, MAT2011-27470-C02-02, CSD2009-00013]; European Research Council [ERC-259374-Sylo]; ', 'We thank Maria Jose Calderon for useful discussions. We acknowledge funding from the Spanish Ministry for Science and Innovation through Grants No. MA', 'Alberca A, 2012, PHYS REV B, V86, DOI 10.1103/PhysRevB.86.144416; Alberca A, 2011, PHYS REV B, V84, DOI 10.1103/PhysRevB.84.134402; [Anonymous], 1996,', '49', 1, 1, 'AMER PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '1098-0121', '', 'PHYS REV B', 'Phys. Rev.', 'OCT 11', '2013', '88', '13', '', '', '', '', '', '134410', '10.1103/PhysRevB.88.134410', '', '12', '', 'Physi', 'Physi', '233GF', 'WOS:0', 0, 0),
(421, '', 'J', 'Fente, A;Suderow, H;Vieira, S;Nemes, NM;Garcia-Hernandez, M;Bud''ko, SL;Canfield, PC;', 'Fente, A.; Suderow, H.; Vieira, S.; Nemes, N. M.; Garcia-Hernandez, M.; Bud''ko, S. L.; Canfield, P. C.', '', '', '', '', 'Low temperature magnetic transitions of single crystal HoBi', 'SOLID STATE COMMUNICATIONS', '', '', 'English', 'Article', '', '', '', '', '', 'Holmium; Bismuth; Single crystal; Magnetic transitions', 'We present resistivity, specific heat and magnetization measurements in high quality single crystals of HoBi, with a residual resistivity ratio of 126. We find, from the temperature and field dependence of the magnetization, an antiferromagnetic transition at 5.7 K, which evolves, under magnetic fields, into a series of up to five metamagnetic phases. (C) 2013 Elsevier Ltd. All rights reserved.', '[Fente, A.; Suderow, H.; Vieira, S.] Univ Autonoma Madrid, Dept Fis Mat Condensada, Inst Ciencia Mat Nicolas Cabrera, Lab Bajas Temp, E-28049 Madrid, ', 'Suderow, H (reprint author), Univ Autonoma Madrid, Dept Fis Mat Condensada, Inst Ciencia Mat Nicolas Cabrera, Lab Bajas Temp, Cantoblanco, E-28049 Mad', 'hermann.suderow@uam.es', 'Spanish MINECO [CSD2007-00010, FIS2011-23488, MAT2011-27470-C02-02]; Comunidad de Madrid through program Nanobiomagnet; US Department of Energy, Basic', 'We thank discussions with J.V. Alvarez. This work was supported by the Spanish MINECO (Consolider Ingenio Molecular Nanoscience CSD2007-00010 program,', 'ANDERSEN NH, 1980, J PHYS C SOLID STATE, V13, P5137, DOI 10.1088/0022-3719/13/27/011; Aoki D, 2001, NATURE, V413, P613, DOI 10.1038/35098048; Bhardwaj', '27', 0, 0, 'PERGAMON-ELSEVIER SCIENCE LTD', 'OXFORD', 'THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND', '0038-1098', '', 'SOLID STAT', 'Solid Stat', 'OCT', '2013', '171', '', '', '', '', '59', '63', '', '10.1016/j.ssc.2013.07.027', '', '5', '', 'Physi', 'Physi', '240ZM', 'WOS:0', 0, 0),
(422, '', 'J', 'Sanz, M;Oujja, M;Rebollar, E;Marco, JF;de la Figuera, J;Monti, M;Bollero, A;Camarero, J;Pedrosa, FJ;Garcia-Hernandez, M;Castillejo, M;', 'Sanz, Mikel; Oujja, Mohamed; Rebollar, Esther; Marco, Jose F.; de la Figuera, Juan; Monti, Matteo; Bollero, Alberto; Camarero, Julio; Pedrosa, Francisco J.; Garcia-Hernandez, Mar; Castillejo, Marta', '', '', '', '', 'Stoichiometric magnetite grown by infrared nanosecond pulsed laser deposition', 'APPLIED SURFACE SCIENCE', '', '', 'English', 'Article', '', '', '', '', '', 'Pulsed laser deposition; Nanocrystalline magnetite fabrication; Magnetic properties', 'Pulsed laser deposition (PLD) is a versatile technique for the fabrication of nanostructures due to the possibilities it offers to control size and shape of nanostructured deposits by varying the laser parameters. Magnetite nanostructures are currently promising materials to be used in computing, electronic devices and spintronic applications. For all these uses the fabrication of uniform nanostructured pure magnetite thin films is highly advantageous. In PLD of magnetite, the laser irradiation wavelength and substrate temperature crucially affect the composition, crystallinity, surface structure and the magnetic properties of the grown samples. This work shows that the use of nanosecond IR laser at 1064 nm enhances the quality of the resulting magnetite thin films, compared to the extensively used UV wavelengths. Deposition at 1064 nm, upon heating the substrate at 750 K, produces thin films constituted by stoichiometric magnetite nanoparticles with sharp edges and sizes ranging from 80 to 150 nm, with a Verwey transition at 119 K and a coercivity of 232 Oe at room temperature, close to those of pure bulk magnetite. Thus, IR-PLD of self-prepared hematite sintered targets constitutes a low-cost procedure of fabrication of pure magnetite nanostructured thin films. (C) 2013 Elsevier B.V. All rights reserved.', '[Sanz, Mikel; Oujja, Mohamed; Rebollar, Esther; Marco, Jose F.; de la Figuera, Juan; Monti, Matteo; Castillejo, Marta] CSIC, Inst Quim Fis Rocasolano,', 'Sanz, M (reprint author), CSIC, Inst Quim Fis Rocasolano, Madrid 28006, Spain.', 'mikel.sanz@iqfr.csic.es', 'Ramon y Cajal Programme [RYC2011-08069, RYC-2007-01727]; CSIC; CAM, S2009/Mat-1629; MICINN FPI Programme; EU-FP7 NANOPYME Project [310516];  [CTQ2010-', 'We acknowledge funding under Projects CTQ2010-15680, CONSOLIDER CSD2007-00058 and CSD2009-00013 (MICINN) and MAT2012-38045-C04-01, MAT2011-25598 and M', 'Alexe M, 2009, ADV MATER, V21, P4452, DOI 10.1002/adma.200901381; Ashfold MNR, 2004, CHEM SOC REV, V33, P23, DOI 10.1039/b207644f; BALBERG I, 1978, J ', '46', 4, 4, 'ELSEVIER SCIENCE BV', 'AMSTERDAM', 'PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS', '0169-4332', '', 'APPL SURF ', 'Appl. Surf', 'OCT 1', '2013', '282', '', '', '', '', '642', '651', '', '10.1016/j.apsusc.2013.06.026', '', '10', '', 'Chemi', 'Chemi', '190CJ', 'WOS:0', 0, 0),
(423, '', 'J', 'Okada, T;Gonzalez-Alfaro, Y;Espinosa, A;Watanabe, N;Haeiwa, T;Sonehara, M;Mishima, S;Sato, T;Munoz-Noval, A;Aranda, P;Garcia-Hernandez, M;Ruiz-Hitzky, E;', 'Okada, T.; Gonzalez-Alfaro, Y.; Espinosa, A.; Watanabe, N.; Haeiwa, T.; Sonehara, M.; Mishima, S.; Sato, T.; Munoz-Noval, A.; Aranda, P.; Garcia-Hernandez, M.; Ruiz-Hitzky, E.', '', '', '', '', 'Magnetic and electronic properties of bimagnetic materials comprising cobalt particles within hollow silica decorated with magnetite nanoparticles', 'JOURNAL OF APPLIED PHYSICS', '', '', 'English', 'Article', '', '', '', '', '', '', 'Bimagnetic materials were fabricated by decorating the external surface of rattle-type hollow silica microspheres (which themselves contain metallic cobalt nanoparticles) with magnetite nanoparticles; thus, each magnetic substance was spatially isolated by the silica shell. The amount of magnetite decoration on the co-occluded hollow silica was varied from 1 to 17 mass %. Magnetic and electronic properties of the resulting bimagnetic materials were characterized by superconducting quantum interference device measurements and X-ray absorption spectroscopy, respectively. The ferrous iron in the bimagnetic sample was slightly more oxidized than in the magnetite reference, probably from some charge-transfer because of the SiO2 surface contact, although the overall oxidation state of the samples is very similar to that of magnetite. The temperature dependence of the sample magnetization recorded with Zero Field Cooling and Field Cooling resulted in blocking temperatures for the bimagnetic materials that were close to that of magnetite nanoparticles (176K) and were lower than that for the bare Co-occluded hollow silica (which was above room temperature). Values of coercive force and exchange bias at 300K became quite small after decoration with only minimal amounts of magnetite nanoparticles (1-3 mass %) and were lower than those of magnetite. This is the first example of enhancing superparamagnetism by spatial separation of both Co and magnetite magnetic nanoparticles using a thin wall of diamagnetic silica. (C) 2013 AIP Publishing LLC.', '[Okada, T.; Watanabe, N.; Mishima, S.] Shinshu Univ, Dept Chem & Mat Engn, Nagano 3808553, Japan; [Gonzalez-Alfaro, Y.; Espinosa, A.; Aranda, P.; Garc', 'Okada, T (reprint author), Shinshu Univ, Dept Chem & Mat Engn, Wakasato 4-17-1, Nagano 3808553, Japan.', 'tomohiko@shinshu-u.ac.jp; eduardo@icmm.csic.es', 'JSPS [23655143]; JST (A-STEP); Nippon Sheet Glass Foundation for Materials Science and Engineering; Shinshu University; CICYT (Spain) [MAT2012-31759];', 'T.O. thanks JSPS (Grant-in-Aid for Scientific Research, No. 23655143), JST (A-STEP), Nippon Sheet Glass Foundation for Materials Science and Engineeri', 'Aslam M, 2007, J AM CERAM SOC, V90, P950, DOI 10.1111/j.1551-2916.2007.01509.x; Caruso F, 2001, ADV MATER, V13, P11, DOI 10.1002/1521-4095(200101)13:1', '32', 3, 3, 'AMER INST PHYSICS', 'MELVILLE', 'CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA', '0021-8979', '', 'J APPL PHY', 'J. Appl. P', 'SEP 28', '2013', '114', '12', '', '', '', '', '', '124304', '10.1063/1.4822299', '', '8', '', 'Physi', 'Physi', '231CR', 'WOS:0', 0, 0),
(424, '', 'J', 'Fan, JD;Hao, Y;Munuera, C;Garcia-Hernandez, M;Guell, F;Johansson, EMJ;Boschloo, G;Hagfeldt, A;Cabot, A;', 'Fan, Jiandong; Hao, Yan; Munuera, Carmen; Garcia-Hernandez, Mar; Gueell, Frank; Johansson, Erik M. J.; Boschloo, Gerrit; Hagfeldt, Anders; Cabot, Andreu', '', '', '', '', 'Influence of the Annealing Atmosphere on the Performance of ZnO Nanowire Dye-Sensitized Solar Cells', 'JOURNAL OF PHYSICAL CHEMISTRY C', '', '', 'English', 'Article', '', '', '', '', '', '', 'Postsynthesis thermal treatments are key to promote crystallinity and reduce the defect density in solution-processed nanomaterials. In particular, the annealing atmosphere strongly influences the functional properties of ZnO nanowires (NWs) and specifically their performance as photoanodes in dye-sensitized solar cells (DSCs). We prepared vertically aligned ZnO NWs by a low-cost, high-yield, and up-scalable hydrothermal method and studied the effect of the postannealing atmosphere on their optoelectronic properties and on their performance as electrodes in DSCs. When annealing ZnO NWs under argon, instead of air, significantly higher photoluminescence (PL) UV emission and relatively lower defects-related visible PL emission were obtained. At the same time, Ar-annealing rendered ZnO NWs with higher electrical conductivities, as observed from single NW measurements using conductive-atomic force microscopy. Furthermore, DSCs based on ZnO NWs annealed in argon were characterized by 50% higher photocurrents than those obtained from air-annealed ZnO. As a result 30% efficiency increases were systematically obtained when using argon as the annealing atmosphere. These results are discussed within the framework of a multiple trapping model for transport and charge transfer, taking into account differences in the defect concentration introduced during the annealing.', '[Fan, Jiandong; Cabot, Andreu] IREC, Catalonia Inst Energy Res, Barcelona 08930, Spain; [Hao, Yan; Johansson, Erik M. J.; Boschloo, Gerrit; Hagfeldt, ', 'Cabot, A (reprint author), IREC, Catalonia Inst Energy Res, Barcelona 08930, Spain.', 'acabot@irec.cat', 'European Regional Development Funds; Agencia de Gestio d''Ajuts Universitaris i de Recerca (AGAUR) from the Catalan Government; "Juan de la Cierva" pos', 'The research was supported by the European Regional Development Funds. J.F. is thankful for the FI-DGR grant from the Agencia de Gestio d''Ajuts Univer', 'Bisquert J, 2003, APPL PHYS A-MATER, V77, P507, DOI 10.1007/s00339-002-1479-4; Bisquert J, 2004, J PHYS CHEM B, V108, P2313, DOI 10.1021/jp035395y; Bo', '53', 18, 19, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '1932-7447', '', 'J PHYS CHE', 'J. Phys. C', 'AUG 15', '2013', '117', '32', '', '', '', '16349', '16356', '', '10.1021/jp405557b', '', '8', '', 'Chemi', 'Chemi', '203NY', 'WOS:0', 0, 0),
(425, '', 'J', 'Guglieri, C;Espinosa, A;Carmona, N;Laguna-Marco, MA;Cespedes, E;Ruiz-Gonzalez, ML;Gonzalez-Calbet, J;Garcia-Hernandez, M;Garcia, MA;Chaboy, J;', 'Guglieri, C.; Espinosa, A.; Carmona, N.; Laguna-Marco, M. A.; Cespedes, E.; Ruiz-Gonzalez, M. L.; Gonzalez-Calbet, J.; Garcia-Hernandez, M.; Garcia, M. A.; Chaboy, J.', '', '', '', '', 'Relationship between the Magnetic Properties and the Formation of a ZnS/ZnO Interface in S-Capped ZnO Nanoparticles and ZnS-ZnO Thin Films', 'JOURNAL OF PHYSICAL CHEMISTRY C', '', '', 'English', 'Article', '', '', '', '', '', '', 'We have synthesized ZnO nanoparticles capped with butanethiol, octanethiol, and dodecanethiol. In all of the cases, the capped ZnO nanoparticles exhibit ferromagnetic-like behavior up to room temperature whose intrinsic origin has been demonstrated by using both X-ray magnetic circular dichroism (XMCD) and X-ray absorption spectroscopy (XAS) at the Zn K-edge. Using these tools, we have also determined that the occurrence of ferromagnetism does not critically depend on the details of the synthesis but on the formation of a pristine ZnS/ZnO interface. Within this interface, ferromagnetism is favored in those regions where the local order is closer to wurzite-like ZnO than to w-ZnS. The study of ZnS-ZnO films prepared by cosputtering clearly indicates that increasing the disorder of this interface weakens the onset of ferromagnetic behavior.', '[Guglieri, C.; Laguna-Marco, M. A.; Chaboy, J.] Univ Zaragoza, Consejo Super Invest Cient, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain; [Espinosa', 'Chaboy, J (reprint author), Univ Zaragoza, Consejo Super Invest Cient, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain.', 'jchaboy@unizar.es', 'Madrid Government project NANOBIOMAGNET [S2009/MAT-1726]; Ministerio de Educacion y Ciencia of Spain; Ministerio de Ciencia e Innovacion of Spain; CSI', 'This work was partially supported by Spanish MAT2011-27573-C04-04, MAT2010-16022, CSD2009-00013, FIS-2008-06249, CSD2009-00013, MAT2011-27470-C02-02 a', '[Anonymous], 2003, J AM CHEM SOC, V125, P1128; Barla A, 2007, PHYS REV B, V76, DOI 10.1103/PhysRevB.76.125201; Cespedes E, 2011, J PHYS CHEM C, V115, ', '33', 6, 6, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '1932-7447', '', 'J PHYS CHE', 'J. Phys. C', 'JUN 13', '2013', '117', '23', '', '', '', '12199', '12209', '', '10.1021/jp403336z', '', '11', '', 'Chemi', 'Chemi', '167OE', 'WOS:0', 1, 0),
(426, '', 'J', 'Retuerto, M;Munoz, A;Martinez-Lope, MJ;Garcia-Hernandez, M;Andre, G;Krezhov, K;Alonso, JA;', 'Retuerto, M.; Munoz, A.; Martinez-Lope, M. J.; Garcia-Hernandez, M.; Andre, G.; Krezhov, K.; Alonso, J. A.', '', '', '', '', 'Influence of the Bi3+ electron lone pair in the evolution of the crystal and magnetic structure of La1-xBixMn2O5 oxides', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', 'English', 'Article', '', '', '', '', '', '', 'La1-xBixMn2O5 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) oxides are members of the RMn2O5 family. The entire series has been prepared in polycrystalline form by a citrate technique. The evolution of their magnetic and crystallographic structures has been investigated by neutron powder diffraction (NPD) and magnetization measurements. All the samples crystallize in an orthorhombic structure with space group Pbam containing infinite chains of Mn4+O6 octahedra sharing edges, linked together by Mn3+O5 pyramids and (La/Bi)O-8 units. These units become strongly distorted as the amount of Bi increases, due to the electron lone pair of Bi3+. All the members of the series are magnetically ordered below T-N = 25-40 K and they present different magnetic structures. For the samples with low Bi content (x = 0.2 and 0.4) the magnetic structure is characterized by the propagation vector k = (0, 0, 1/2). The magnetic moments of the Mn4+ ions placed at octahedral sites are ordered according to the basis vectors (G(x), A(y), 0) whereas the Mn3+ moments, located at pyramidal sites, are ordered according to the basis vectors (0, 0, C-z). When the content of Bi increases, two different propagation vectors are needed to explain the magnetic structure: k(1) = (0, 0, 1/2) and k2 = (1/2, 0, 1/2). For x = 0.6 and 0.8, k(2) is predominant over k(1) and for this propagation vector (k(2)) the magnetic arrangement is defined by the basis vectors (G(x), A(y), 0) and (F-x, C-y, 0) for Mn4+ and Mn3+ ions, respectively.', '[Retuerto, M.] Rutgers State Univ, Dept Chem, Piscataway, NJ 08854 USA; [Munoz, A.] Univ Carlos III, EPS, Dept Fis Aplicada, E-28911 Leganes, Spain; [', 'Retuerto, M (reprint author), Rutgers State Univ, Dept Chem, POB 939, Piscataway, NJ 08854 USA.', 'retuerto@rci.rutgers.edu', 'Spanish Ministry of Science and Technology [MAT2010-16404]; Spanish Ministry of Education; Fulbright Commission', 'We are grateful for financial support from the Spanish Ministry of Science and Technology to project MAT2010-16404 and from the Spanish Ministry of Ed', 'Alonso JA, 1997, J PHYS-CONDENS MAT, V9, P8515, DOI 10.1088/0953-8984/9/40/017; Alonso JA, 1997, J SOLID STATE CHEM, V129, P105, DOI 10.1006/jssc.1996', '32', 0, 0, 'IOP PUBLISHING LTD', 'BRISTOL', 'TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND', '0953-8984', '', 'J PHYS-CON', 'J. Phys.-C', 'MAY 29', '2013', '25', '21', '', '', '', '', '', '216002', '10.1088/0953-8984/25/21/216002', '', '11', '', 'Physi', 'Physi', '148QH', 'WOS:0', 0, 0),
(427, '', 'J', 'Cortes-Gil, R;Ruiz-Gonzalez, ML;Alonso, JM;Garcia-Hernandez, M;Hernando, A;Gonzalez-Calbet, JM;', 'Cortes-Gil, Raquel; Luisa Ruiz-Gonzalez, M.; Alonso, Jose M.; Garcia-Hernandez, Mar; Hernando, Antonio; Gonzalez-Calbet, Jose M.', '', '', '', '', 'Magnetoresistance and Ferromagnetism in Disordered LaCu0.5Mn0.5O3 Perovskite', 'CHEMISTRY OF MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'LaCu0.5Mn0.5O3; orthorhombic perovskite; magneto resistance; superexchange interactions; ferromagnetism; antiferromagnetism', 'Magnetoresistance (MR) in half doped copper LaCu0.5Mn0.5O3 manganese related perovskite, synthesized by means of a soft chemistry pathway, is reported. Characterization by means of Rietveld refinement from powder X-ray diffraction data, SAED, HREM, and EELS indicates a random occupation of Cu2+ and Mn4+ at the octahedral sites of an orthorhombic perovskite lattice. This disordered situation is in agreement to the absence of charge ordering. LaCu0.5Mn0.5O3 exhibits antiferromagnetic behavior related to Mn4+-O-Mn4+ and Cu2+-O-Cu2+ interactions. Ferromagnetic interactions are also evident as a consequence of a disordered arrangement of Cu2+ and Mn4+ over the octahedral sites, being the coexistence of these ferromagnetic superexchange interactions related to the observed MR behavior at low temperature.', '[Cortes-Gil, Raquel; Luisa Ruiz-Gonzalez, M.; Gonzalez-Calbet, Jose M.] Univ Complutense CEI Moncloa, Fac Quim, UCM, Dept Quim Inorgan, Madrid 28040, ', 'Gonzalez-Calbet, JM (reprint author), Univ Complutense CEI Moncloa, Fac Quim, UCM, Dept Quim Inorgan, Madrid 28040, Spain.', 'jgcalbet@ucm.es', 'Spanish Ministerio de Ciencia e Innovacion [CSD2009-00013, MAT2007-61954, MAT2011-23068, MAT2011-27470-C02-02]; PICATA postdoctoral fellowship of the ', 'This work has been partially supported by the Spanish Ministerio de Ciencia e Innovacion grants: CSD2009-00013, MAT2007-61954, MAT2011-23068, and MAT2', 'ANDERSON MT, 1993, PROG SOLID STATE CH, V22, P197, DOI 10.1016/0079-6786(93)90004-B; ANDERSON PW, 1959, PHYS REV, V115, P2, DOI 10.1103/PhysRev.115.2;', '58', 0, 0, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0897-4756', '', 'CHEM MATER', 'Chem. Mat.', 'MAY 28', '2013', '25', '10', '', '', '', '2100', '2108', '', '10.1021/cm400655x', '', '9', '', 'Chemi', 'Chemi', '156XA', 'WOS:0', 0, 0),
(428, '', 'J', 'Bernardo, MS;Jardiel, T;Peiteado, M;Mompean, FJ;Garcia-Hernandez, M;Garcia, MA;Villegas, M;Caballero, AC;', 'Bernardo, M. S.; Jardiel, T.; Peiteado, M.; Mompean, F. J.; Garcia-Hernandez, M.; Garcia, M. A.; Villegas, M.; Caballero, A. C.', '', '', '', '', 'Intrinsic Compositional Inhomogeneities in Bulk Ti-Doped BiFeO3: Microstructure Development and Multiferroic Properties', 'CHEMISTRY OF MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'BiFeO3; nanostructural domains; multiferroics', 'Ti-doped BiFeO3 ceramics prepared by a mixed-oxide route were structurally characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM), giving evidence of the formation of an inner structure at the nanometric scale. The observed nanograins are separated by Ti-rich areas that originate due to the tendency of the titanium dopant to segregate from the perovskite lattice. Such a peculiar nanostructure is responsible for the changes produced in both the electrical and the magnetic properties of BiFeO3 upon titanium doping: the Ti-rich interfaces act as resistive layers that increase the direct-current (dc) resistivity of the material, while the existence of structural domains in the scale of tens of nanometers causes a ferrimagnetic-like behavior with a huge coercive field (on the order of 20 kOe), even at room temperature.', '[Bernardo, M. S.; Jardiel, T.; Garcia, M. A.; Villegas, M.; Caballero, A. C.] Inst Ceram & Vidrio CSIC, Dept Electroceram, Madrid 28049, Spain; [Peite', 'Bernardo, MS (reprint author), Inst Ceram & Vidrio CSIC, Dept Electroceram, Kelsen 5, Madrid 28049, Spain.', 'mbernardo@icv.csic.es', 'CICYT MAT [2010-16614, CSD2009-00013, MAT-27470-C02-02]; Spanish Ministry of Education [AP2008-00053]; Spanish National Research Council (CSIC); Europ', 'This work has been conducted within the CICYT MAT 2010-16614, CSD2009-00013, and MAT-27470-C02-02 projects. M.S.B. also acknowledges the Spanish Minis', 'Al-Haj M, 2010, CRYST RES TECHNOL, V45, P89, DOI 10.1002/crat.200900550; Azough F., 2009, J EUR CERAM SOC, V30, P727; Barsoukov E, 2005, IMPEDANCE SPE', '56', 15, 15, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0897-4756', '', 'CHEM MATER', 'Chem. Mat.', 'MAY 14', '2013', '25', '9', '', '', '', '1533', '1541', '', '10.1021/cm303743h', '', '9', '', 'Chemi', 'Chemi', '147RL', 'WOS:0', 0, 0),
(429, '', 'J', 'Awad, AA;Lara, A;Hernandez, MG;Metlushko, V;Guslienko, KY;Aliev, FG;', 'Awad, A. A.; Lara, A.; Garcia Hernandez, M.; Metlushko, V.; Guslienko, K. Y.; Aliev, F. G.', '', '', '', '', 'Spin Wave Excitations and Winter''s Magnons in Vertically Coupled Vortex State Permalloy Dots', 'JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM', '', '', 'English', 'Article', '', '', '', '', '', 'Magnetic vortex; Spin waves; Dipolar; Exchange coupling', 'Circular soft magnetic dots are the main elements of many proposed novel spintronics devices, capable of fascinating spin-based electronics applications, from extremely sensitive magnetic field sensors, to current-tunable microwave vortex oscillators. Here, we investigate static and broadband dynamic magnetization responses of vertically coupled Permalloy (Py) magnetic dots in the vortex state in layered nanopillars (experiment and simulations), which were explored as a function of in-plane magnetic field and interlayer separation. Under reduction of magnetic field from saturation for the field range just above vortex-vortex ground state. We observe a metastable double vortex state for each of the dots. In this state, novel kinds of spin waves (Winter''s magnons along domain walls between vortex cores and half-edge antivortex) are excited. For dipolarly coupled circular Py(25 nm)/Cu(20 nm)/Py(25 nm) trilayer nanopilars of diameter 600 nm, a small in-plane field splits the eigenfrequencies of azimuthal spin wave modes inducing an abrupt transition between acoustic (in-phase) and optic (out-of-phase) kinds of the low-lying coupled spin wave modes. Qualitatively similar changes (although more gradual and at higher values of in-plane fields) occur in the exchange coupled Py(25 nm)/Cu(1 nm)/Py(25 nm) trilayer nanopillars. These findings are in qualitative agreement with micromagnetic dynamic simulations.', '[Awad, A. A.; Lara, A.; Aliev, F. G.] Univ Autonoma Madrid, Dpto Fis Mat Condensada C 3, E-28049 Madrid, Spain; [Garcia Hernandez, M.] CISC, Inst Cien', 'Aliev, FG (reprint author), Univ Autonoma Madrid, Dpto Fis Mat Condensada C 3, E-28049 Madrid, Spain.', 'farkhad.aliev@uam.es', 'Spanish MINECO [MAT2012-32743, MAT2009-10139]; CM [P2009/MAT-1726]; IKERBASQUE; MEC [PIB2010US-00153, FIS2010-20979-C02-01]', 'The authors acknowledge support from Spanish MINECO (MAT2012-32743; MAT2009-10139) and CM (P2009/MAT-1726). K. G. acknowledges support by IKERBASQUE a', 'Aliev FG, 2011, PHYS REV B, V84, DOI 10.1103/PhysRevB.84.144406; Buchanan KS, 2005, PHYS REV B, V72, DOI 10.1103/PhysRevB.72.134415; Donahue M. J., 19', '5', 0, 0, 'SPRINGER', 'NEW YORK', '233 SPRING ST, NEW YORK, NY 10013 USA', '1557-1939', '', 'J SUPERCON', 'J. Superco', 'MAY', '2013', '26', '5', 'SI', '', '', '2057', '2061', '', '10.1007/s10948-012-1829-1', '', '5', '', 'Physi', 'Physi', '211KS', 'WOS:0', 0, 0),
(430, '', 'J', 'Bigall, NC;Wilhelm, C;Beoutis, ML;Garcia-Hernandez, M;Khan, AA;Giannini, C;Sanchez-Ferrer, A;Mezzenga, R;Materia, ME;Garcia, MA;Gazeau, F;Bittner, AM;Manna, L;Pellegrino, T;', 'Bigall, Nadja C.; Wilhelm, Claire; Beoutis, Marie-Lys; Garcia-Hernandez, Mar; Khan, Abid A.; Giannini, Cinzia; Sanchez-Ferrer, Antoni; Mezzenga, Raffaele; Materia, Maria Elena; Garcia, Miguel A.; Gazeau, Florence; Bittner, Alexander M.; Manna, Libera', '', '', '', '', 'Colloidal Ordered Assemblies in a Polymer Shell-A Novel Type of Magnetic Nanobeads for Theranostic Applications', 'CHEMISTRY OF MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'colloidal assemblies; polymer shell; MRI contrast agents; magnetic nanoparticles', 'We present the synthesis of polymer embedded colloidal ordered assemblies, built from highly ordered superparamagnetic manganese iron oxide nanocrystals. Each assembly is wrapped into a thin polymer shell. In-depth characterization of the nanoparticles by TEM, SAXS, SQUID, and magnetophoresis indicates that these colloidal hybrids exhibit high mobilities in external magnetic fields, and that they could efficiently serve as contrast enhancers in magnetic resonance imaging.', '[Bigall, Nadja C.; Materia, Maria Elena; Manna, Liberato; Pellegrino, Teresa] Ist Italiano Tecnol, I-16163 Genoa, Italy; [Wilhelm, Claire; Beoutis, Ma', 'Pellegrino, T (reprint author), Ist Italiano Tecnol, Via Morego 30, I-16163 Genoa, Italy.', 'teresa.pellegrino@unile.it', 'European projects Magnifyco [NMP4-SL-2009-228622]; ERC grant NANO-ARCH [240111]; Italian FIRB projects [588 BAP115AYN]; Rete integrata per la Nano Med', 'This work was supported in part by the European projects Magnifyco (contract no. NMP4-SL-2009-228622) and the starting ERC grant NANO-ARCH (contract n', 'Silva AKA, 2012, NANOMEDICINE-UK, V7, P1713, DOI 10.2217/NNM.12.40; Baranov D, 2010, NANO LETT, V10, P743, DOI 10.1021/nl903946n; Bigall NC, 2012, NAN', '33', 15, 15, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0897-4756', '', 'CHEM MATER', 'Chem. Mat.', 'APR 9', '2013', '25', '7', '', '', '', '1055', '1062', '', '10.1021/cm3036746', '', '8', '', 'Chemi', 'Chemi', '124BK', 'WOS:0', 0, 0),
(431, '', 'J', 'Tissen, VG;Osorio, MR;Brison, JP;Nemes, NM;Garcia-Hernandez, M;Cario, L;Rodiere, P;Vieira, S;Suderow, H;', 'Tissen, V. G.; Osorio, M. R.; Brison, J. P.; Nemes, N. M.; Garcia-Hernandez, M.; Cario, L.; Rodiere, P.; Vieira, S.; Suderow, H.', '', '', '', '', 'Pressure dependence of superconducting critical temperature and upper critical field of 2H-NbS2', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'We present measurements of the superconducting critical temperature T-c and upper critical field H-c2 as a function of pressure in the transition metal dichalcogenide 2H-NbS2 up to 20 GPa. We observe that Tc increases smoothly from 6 K at ambient pressure to about 8.9 K at 20 GPa. This range of increase is comparable to the one found previously in 2H-NbSe2. The temperature dependence of the upper critical field H-c2(T) of 2H-NbS2 varies considerably when increasing the pressure. At low pressures, H-c2(0) decreases, and at higher pressures both T-c and H-c2(0) increase simultaneously. This points out that there are pressure induced changes of the Fermi surface, which we analyze in terms of a simplified two-band approach. DOI: 10.1103/ PhysRevB. 87.134502', '[Tissen, V. G.] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Moscow Region, Russia; [Tissen, V. G.; Osorio, M. R.; Vieira, S.; Suder', '', 'hermann.suderow@uam.es', 'Spanish MINECO [CSD2007-00010, CSD2009-00013, SAB2009-0057, FIS2011-23488, MAT2011-27470-C02-02]; Comunidad de Madrid through program Nanobiomagnet; N', 'The Laboratorio de Bajas Temperaturas is associated with the ICMM of the CSIC. This work was supported by Spanish MINECO (Consolider-Ingenio CSD2007-0', 'Barisic N, 2011, PHYS REV B, V84, DOI 10.1103/PhysRevB.84.075157; Boaknin E, 2003, PHYS REV LETT, V90, DOI 10.1103/PhysRevLett.90.117003; Bulaevskii L', '57', 3, 3, 'AMER PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '1098-0121', '', 'PHYS REV B', 'Phys. Rev.', 'APR 3', '2013', '87', '13', '', '', '', '', '', '', '10.1103/PhysRevB.87.134502', '', '6', '', 'Physi', 'Physi', '119LB', 'WOS:0', 0, 0),
(432, '', 'J', 'Espinosa, A;Munoz-Noval, A;Garcia-Hernandez, M;Serrano, A;de la Morena, JJ;Figuerola, A;Quarta, A;Pellegrino, T;Wilhelm, C;Garcia, MA;', 'Espinosa, A.; Munoz-Noval, A.; Garcia-Hernandez, M.; Serrano, A.; Jimenez de la Morena, J.; Figuerola, A.; Quarta, A.; Pellegrino, T.; Wilhelm, C.; Garcia, M. A.', '', '', '', '', 'Magnetic properties of iron oxide nanoparticles prepared by seeded-growth route', 'JOURNAL OF NANOPARTICLE RESEARCH', '', '', 'English', 'Article', '', '', '', '', '', 'Magnetic nanoparticles; Superparamagnetism; X-ray absorption spectroscopy; Antiphase boundaries', 'In this work we investigate the magnetic properties of iron oxide nanoparticles obtained by two-step synthesis (seeded-growth route) with sizes that range from 6 to 18 nm. The initial seeds result monocrystalline and exhibit ferromagnetic behavior with low saturation field. The subsequent growth of a shell enhances the anisotropy inducing magnetic frustration, and, consequently, reducing its magnetization. This increase in anisotropy occurs suddenly at a certain size (similar to 10 nm). Electronic and structural analysis with X-ray absorption spectroscopy indicates a step reduction in the oxidation state as the particle reaches 10 nm size while keeping its overall structure in spite of the magnetic polydispersity. The formation of antiphase magnetic boundaries due to island percolation in the growing shells is hypothesized to be the mechanism responsible of the magnetic behavior, as a direct consequence of the two-step synthesis route of the nanoparticles.', '[Espinosa, A.; Garcia-Hernandez, M.; Jimenez de la Morena, J.] CSIC, ICMM, Madrid 28049, Spain; [Munoz-Noval, A.; Serrano, A.; Jimenez de la Morena, J', 'Espinosa, A (reprint author), CSIC, ICMM, Sor Juana Ines de la Cruz 3, Madrid 28049, Spain.', 'anaespinosamr@gmail.com', 'European project MAGNIFYCO [NMP4-SL-2009-228622]; Spanish Ministerio de Economia y Competitividad [CSD2009-00013, MAT2011-27470-C02-02, FIS-2008-06249', 'This work was supported by the European project MAGNIFYCO (Contract NMP4-SL-2009-228622); Spanish Ministerio de Economia y Competitividad grants CSD20', 'Arora SK, 2005, J MAGN MAGN MATER, V286, P463, DOI 10.1016/j.jmmm.2004.09.066; Azad AK, 2005, MATER RES BULL, V40, P1633, DOI 10.1016/j.materresbull.2', '50', 4, 4, 'SPRINGER', 'DORDRECHT', 'VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS', '1388-0764', '', 'J NANOPART', 'J. Nanopar', 'APR', '2013', '15', '4', '', '', '', '', '', '', '10.1007/s11051-013-1514-8', '', '13', '', 'Chemi', 'Chemi', '139AS', 'WOS:0', 0, 0),
(433, '', 'J', 'Bruno, FY;Schmidt, R;Varela, M;Garcia-Barriocanal, J;Rivera-Calzada, A;Cuellar, FA;Leon, C;Thakur, P;Cezar, JC;Brookes, NB;Garcia-Hernandez, M;Dagotto, E;Pennycook, SJ;Santamaria, J;', 'Bruno, Flavio Y.; Schmidt, Rainer; Varela, Maria; Garcia-Barriocanal, Javier; Rivera-Calzada, Alberto; Cuellar, Fabian A.; Leon, Carlos; Thakur, Pardeep; Cezar, Julio C.; Brookes, Nicholas B.; Garcia-Hernandez, Mar; Dagotto, Elbio; Pennycook, Stephen', '', '', '', '', 'Electron Doping by Charge Transfer at LaFeO3/Sm2CuO4 Epitaxial Interfaces', 'ADVANCED MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'charge transfer; interface phenomena; superlattices', NULL, '[Bruno, Flavio Y.; Schmidt, Rainer; Varela, Maria; Garcia-Barriocanal, Javier; Rivera-Calzada, Alberto; Cuellar, Fabian A.; Leon, Carlos; Santamaria, ', 'Bruno, FY (reprint author), Univ Complutense Madrid, GFMC Dpto Fis Aplicada 3, Campus Moncloa, E-28040 Madrid, Spain.', 'avioyb@fis.ucm.es; jacsan@fis.ucm.es', 'Spanish MICINN [MAT 2011 27470]; Consolider Ingenio [CSD2009-00013, CAM S2009-MAT 1756]; ERC [239739 STEMOX]; U.S. Department of Energy, Basic Energy ', 'Work at UCM supported by Spanish MICINN Grant MAT 2011 27470, Consolider Ingenio CSD2009-00013 (IMAGINE), CAM S2009-MAT 1756 (PHAMA) and ERC starting ', 'Alvarez G, 2005, PHYS REV B, V71, DOI 10.1103/PhysRevB.71.014514; Barsoukov E, 2005, IMPEDANCE SPECTROSCOPY: THEORY, EXPERIMENT, AND APPLICATIONS, 2ND', '40', 1, 1, 'WILEY-V C H VERLAG GMBH', 'WEINHEIM', 'BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY', '0935-9648', '', 'ADV MATER', 'Adv. Mater', 'MAR 13', '2013', '25', '10', '', '', '', '1468', '1473', '', '10.1002/adma.201203483', '', '6', '', 'Chemi', 'Chemi', '104PR', 'WOS:0', 0, 0),
(434, '', 'J', 'Carrasco, PM;Tzounis, L;Mompean, FJ;Strati, K;Georgopanos, P;Garcia-Hernandez, M;Stamm, M;Cabanero, G;Odriozola, I;Avgeropoulos, A;Garcia, I;', 'Carrasco, P. M.; Tzounis, L.; Mompean, F. J.; Strati, K.; Georgopanos, P.; Garcia-Hernandez, M.; Stamm, M.; Cabanero, G.; Odriozola, I.; Avgeropoulos, A.; Garcia, I.', '', '', '', '', 'Thermoset Magnetic Materials Based on Poly(ionic liquid)s Block Copolymers', 'MACROMOLECULES', '', '', 'English', 'Article', '', '', '', '', '', '', 'A new methodology for the preparation of nanostructured magnetic thermoset materials without any kind of metal oxide or metal magnetic nanoparticles has been proposed. The present study focuses on the nanostructuration of thermoset materials based on poly(ionic liquid)s block copolymer and the subsequent production of magnetic nanostructured thermoset. Judicious selection of block copolymer, such as P2VP-b-PMMA, soluble in epoxy and its subsequent quaternization leads to a phase modification of the system, from totally soluble to a nanostructured system. Different degree of quaternization of the pyridine groups showed the range of quaternization values which allowed the nanostructuration of the thermoset. Magnetic material was obtained by anion exchange of the quaternized poly(ionic liquid) block copolymer without using any kind of metal oxide or metal magnetic nanoparticles. The different materials obtained by quaternization of the block copolymers, the anion exchange of the polymeric ionic liquid and thermoset materials were characterized by H-1 nuclear magnetic resonance (H-1 NMR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), high resolution transmission electron microscopy (HR-TEM) and magnetic properties were measured by a superconducting quantum interference device (SQUID).', '[Carrasco, P. M.; Cabanero, G.; Odriozola, I.; Garcia, I.] IK4 CIDETEC Ctr Electrochem Technol, New Mat Dept, Donostia San Sebastian 20009, Spain; [Mo', 'Avgeropoulos, A (reprint author), Univ Ioannina, Polymers Lab, Dept Mat Sci Engn, Univ Campus, GR-45110 Ioannina, Greece.', 'aavger@cc.uoi.gr; iggarcia@cidetec.es', 'POCO European Project [NMP-213939]; PIL-to-MARKET Project [FP7-PEOPLE-IAPP-2008-230747]; IMAGINE [CSD2009-00013];  [MAT2011-27470-C02-02]', 'The present work was supported by POCO European Project (NMP-213939), the PIL-to-MARKET Project (FP7-PEOPLE-IAPP-2008-230747), MAT2011-27470-C02-02, a', 'Baker C, 2004, J MAGN MAGN MATER, V280, P412, DOI 10.1016/j.jmmm.2004.03.037; Binnemans K, 2007, CHEM REV, V107, P2592, DOI 10.1021/cr050979c; Blanco ', '37', 4, 4, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0024-9297', '', 'MACROMOLEC', 'Macromolec', 'MAR 12', '2013', '46', '5', '', '', '', '1860', '1867', '', '10.1021/ma302261c', '', '8', '', 'Polym', 'Polym', '106TW', 'WOS:0', 0, 0),
(435, '', 'J', 'Ruano, M;Diaz, M;Martinez, L;Navarro, E;Roman, E;Garcia-Hernandez, M;Espinosa, A;Ballesteros, C;Fermento, R;Huttel, Y;', 'Ruano, M.; Diaz, M.; Martinez, L.; Navarro, E.; Roman, E.; Garcia-Hernandez, M.; Espinosa, A.; Ballesteros, C.; Fermento, R.; Huttel, Y.', '', '', '', '', 'Matrix and interaction effects on the magnetic properties of Co nanoparticles embedded in gold and vanadium', 'PHYSICAL CHEMISTRY CHEMICAL PHYSICS', '', '', 'English', 'Article', '', '', '', '', '', '', 'The study of the magnetic properties of Co nanoparticles (with an average diameter of 10.3 nm) grown using a gas-phase aggregation source and embedded in Au and V matrices is presented. We investigate how the matrix, the number of embedded nanoparticles (counted by coverage percentage), the interparticle interactions and the complex nanoparticles/matrix interface structure define the magnetic properties of the studied systems. A threshold coverage of 3.5% of a monolayer was found in both studied systems: below this coverage, nanoparticles behave as an assembly of independent single-domain magnetic entities with uniaxial anisotropy. Above the threshold it is found that the magnetic behavior of the systems is more matrix dependent. While magnetic relaxation and Henkel plots measurements stress the importance of the dipolar interactions and the formation of coherent clusters in the case of the Au matrix, the magnetic behavior of cobalt clusters embedded in the vanadium matrix is explained through the formation of a spin glass-like state at the V-Co interface that screens the magnetic interactions between NPs.', '[Ruano, M.; Diaz, M.; Martinez, L.; Roman, E.; Garcia-Hernandez, M.; Espinosa, A.; Huttel, Y.] Inst Ciencia Mat Madrid ICMM CSIC, Madrid 28049, Spain;', 'Huttel, Y (reprint author), Inst Ciencia Mat Madrid ICMM CSIC, C Sor Juana Ines de la Cruz 3, Madrid 28049, Spain.', 'huttel@icmm.csic.es', 'Spanish Ministerio de Economia y Competitividad [MAT2011-29194-C02-02, MAT2011-27470-C02-02, MAT-2007-66181, MAT2008-06765-C02, MAT2008-06517-C02-01, ', 'TEM work has been performed at LABMET laboratory associated to the Red de Laboratorios of Comunidad de Madrid. Work was supported by the Spanish Minis', 'Allia P, 1997, J APPL PHYS, V81, P4599, DOI 10.1063/1.365175; Allia P, 2001, PHYS REV B, V64, DOI 10.1103/PhysRevB.64.144420; Bai JM, 2005, APPL PHYS ', '', 0, 0, '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 0, 0),
(436, '', 'J', 'Larregola, SA;Pedregosa, JC;Alguero, M;Jimenez, R;Garcia-Hernandez, M;Fernandez-Diaz, MT;Alonso, JA;', 'Larregola, Sebastian A.; Pedregosa, Jose C.; Alguero, Miguel; Jimenez, Ricardo; Garcia-Hernandez, Mar; Fernandez-Diaz, Maria T.; Alonso, Jose A.', '', '', '', '', 'Novel Near-Room-Temperature Type I Multiferroic: Pb(Fe0.5Ti0.25W0.25)O-3 with Coexistence of Ferroelectricity and Weak Ferromagnetism', 'CHEMISTRY OF MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'perovskite; ferroelectric; multiferroic; magnetoelectric; lead', 'We report on the crystal structure evolution and the physical properties of the complex perovskite Pb(Fe0.5Ti0.25W0.25)O-3. It presents a paraelectric to ferroelectric transition at T-C = 293 K, determined by permittivity measurements. The room-temperature neutron powder diffraction pattern (NPD) shows an admixture of the ferroelectric phase (34%, P4mm space group) and the paraelectric polymorph (66%, Pm (3) over barm space group). In both polymorphs, the perovskite crystal structure contains the three B cations (Fe, Ti, W) distributed at random at the octahedral sites, and Pb is shifted away from the center of the cubic (sub)cell. On the other hand, the presence of iron drives the appearance of magnetic interactions above room temperature. This is related to the existence of Fe-rich islands where the strong Fe3+-O-Fe3+ superexchange interactions govern the magnetic behavior. The magnetic structure has been determined from low-temperature NPD experiments as a G-type antiferromagnetic (AFM) cell. Furthermore, there is a net magnetization in the entire range of temperature, which is related to the existence of noncompensated spins in each island. The coexistence of ferroelectricity and a magnetically ordered state and the observation of a possible coupling between both phenomena allow us to suggest the multiferroic-magnetoelectric nature of the sample.', '[Larregola, Sebastian A.; Pedregosa, Jose C.] Univ Nacl San Luis, Dept Quim, Fac Quim Bioquim & Farm, INTEQUI Area Quim Gen & Iorgan Dr Gabino F Puell', 'Larregola, SA (reprint author), Univ Nacl San Luis, Dept Quim, Fac Quim Bioquim & Farm, INTEQUI Area Quim Gen & Iorgan Dr Gabino F Puelle, RA-5700 San', 'salarreg@unsl.edu.ar', 'CONICET [2008-01360]; SECyT-UNSL [PROICO 2-7707 -22/Q823]; Spanish Ministry of Education [MAT2010-16404]', 'SAL. thanks a CONICET fellowship. J.C.P. thanks CONICET (Project PIP No. 2008-01360), SECyT-UNSL (Project PROICO 2-7707 -22/Q823). J.C.P. is a member ', 'Alguero M, 2007, APPL PHYS LETT, V91, DOI 10.1063/1.2778471; ASTROV DN, 1969, SOV PHYS JETP-USSR, V28, P1123; Belik AA, 2009, ANGEW CHEM INT EDIT, V48', '32', 3, 3, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0897-4756', '', 'CHEM MATER', 'Chem. Mat.', 'JUL 24', '2012', '24', '14', '', '', '', '2664', '2672', '', '10.1021/cm300470f', '', '9', '', 'Chemi', 'Chemi', '977OP', 'WOS:0', 0, 0),
(437, '', 'J', 'Cortes-Gil, R;Ruiz-Gonzalez, L;Alonso, JM;Garcia-Hernandez, M;Hernando, A;Gonzalez-Calbet, JM;', 'Cortes-Gil, R.; Ruiz-Gonzalez, L.; Alonso, J. M.; Garcia-Hernandez, M.; Hernando, A.; Gonzalez-Calbet, J. M.', '', '', '', '', 'Stair-like Metamagnetic Transition Induced by Controlled Introduction of Oxygen Deficiency in La0.5Ca0.5MnO3-delta', 'CHEMISTRY OF MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'stair-like metamagnetism; La0.5Ca0.5MnO2.95; anionic vacancies; phase segregation; charge and orbital ordering', 'Stair-like metamagnetic transitions in the oxygen deficient La0.5Ca0.5MnO3-delta perovskite are here for first time reported. This experimental fact sheds light on the knowledge of metamagnetic transition in anion deficient phase segregations systems. Actually, it is shown that controlled reduction of the oxygen content constitutes an alternative pathway to the chemical doping at the A and B positions of the perovskite sublattice. In this way, point defects are created inducing the stair-like transition in a CE-type AFM (antiferromagnetic) manganite.', '[Cortes-Gil, R.; Ruiz-Gonzalez, L.; Gonzalez-Calbet, J. M.] Univ Complutense CEI Moncloa, Fac Quim, UCM, Dept Quim Inorgan, Madrid 28040, Spain; [Alon', 'Gonzalez-Calbet, JM (reprint author), Univ Complutense CEI Moncloa, Fac Quim, UCM, Dept Quim Inorgan, Madrid 28040, Spain.', 'jgcalbet@quim.ucm.es', 'Spanish Ministerio de Ciencia e Innovacion [CSD2009-00013, MAT2007-61954, MAT2011-23068, MAT2011-27470-C02-02]; Moncloa Campus of International Excell', 'This work has been partially supported by the Spanish Ministerio de Ciencia e Innovacion grants: CSD2009-00013, MAT2007-61954, MAT2011-23068 and MAT20', 'Alonso JM, 2006, J PHYS CHEM SOLIDS, V67, P571, DOI 10.1016/j.jpcs.2005.10.159; Alonso JM, 2007, EUR J INORG CHEM, P3350, DOI 10.1002/ejic.200700108; ', '55', 2, 2, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0897-4756', '', 'CHEM MATER', 'Chem. Mat.', 'JUL 10', '2012', '24', '13', '', '', '', '2519', '2526', '', '10.1021/cm300927w', '', '8', '', 'Chemi', 'Chemi', '971JR', 'WOS:0', 0, 0),
(438, '', 'J', 'Galvis, JA;Crespo, M;Guillamon, I;Suderow, H;Vieira, S;Hernandez, MG;Bud''ko, S;Canfield, PC;', 'Galvis, J. A.; Crespo, M.; Guillamon, I.; Suderow, H.; Vieira, S.; Garcia Hernandez, M.; Bud''ko, S.; Canfield, P. C.', '', '', '', '', 'Magnetic and superconducting phase diagrams in ErNi2B2C', 'SOLID STATE COMMUNICATIONS', '', '', 'English', 'Article', '', '', '', '', '', 'Superconductors; Magnetic metals; Tunneling; Magnetic phase diagram', 'We present measurements of the superconducting upper critical field H-c2(T) and the magnetic phase diagram of the superconductor ErNi2B2C made with a scanning tunneling microscope (STM). The magnetic field was applied in the basal plane of the tetragonal crystal structure. We have found large gapless regions in the superconducting phase diagram of ErNi2B2C, extending between different magnetic transitions. A close correlation between magnetic transitions and H-c2(T) is found, showing that superconductivity is strongly linked to magnetism. (C) 2012 Elsevier Ltd. All rights reserved.', '[Galvis, J. A.; Crespo, M.; Guillamon, I.; Suderow, H.; Vieira, S.] Univ Autonoma Madrid, Lab Bajas Temp, Dept Fis Mat Condensada, Inst Ciencia Mat Ni', 'Suderow, H (reprint author), Univ Autonoma Madrid, Lab Bajas Temp, Dept Fis Mat Condensada, Inst Ciencia Mat Nicolas Cabrera,Fac Ciencias, E-28049 Mad', 'hermann.suderow@uam.es', 'U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering; U.S. Department of Energy by Iowa State Uni', 'The Laboratorio de Bajas Temperaturas is associated to the ICMM of the CSIC. This work was supported by the U.S. Department of Energy, Office of Basic', 'CAVA RJ, 1994, NATURE, V367, P252, DOI 10.1038/367252a0; Bluhm H, 2006, PHYS REV B, V73, DOI 10.1103/PhysRevB.73.014514; Brison JP, 2004, J MAGN MAGN ', '41', 3, 3, 'PERGAMON-ELSEVIER SCIENCE LTD', 'OXFORD', 'THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND', '0038-1098', '', 'SOLID STAT', 'Solid Stat', 'JUN', '2012', '152', '12', '', '', '', '1076', '1079', '', '10.1016/j.ssc.2012.03.021', '', '4', '', 'Physi', 'Physi', '952MB', 'WOS:0', 0, 0),
(439, '', 'J', 'Liu, YH;Visani, C;Nemes, NM;Fitzsimmons, MR;Zhu, LY;Tornos, J;Garcia-Hernandez, M;Zhernenkov, M;Hoffmann, A;Leon, C;Santamaria, J;te Velthuis, SGE;', 'Liu, Yaohua; Visani, C.; Nemes, N. M.; Fitzsimmons, M. R.; Zhu, L. Y.; Tornos, J.; Garcia-Hernandez, M.; Zhernenkov, M.; Hoffmann, A.; Leon, C.; Santamaria, J.; te Velthuis, S. G. E.', '', '', '', '', 'Effect of Interface-Induced Exchange Fields on Cuprate-Manganite Spin Switches', 'PHYSICAL REVIEW LETTERS', '', '', 'English', 'Article', '', '', '', '', '', '', 'We examine the anomalous inverse spin switch behavior in La0.7Ca0.3MnO3(LCMO)/YBa2Cu3O7-delta (YBCO)/LCMO trilayers by combined transport studies and polarized neutron reflectometry. Measuring magnetization profiles and magnetoresistance in an in-plane rotating magnetic field, we prove that, contrary to many accepted theoretical scenarios, the relative orientation between the two LCMO''s magnetizations is not sufficient to determine the magnetoresistance. Rather the field dependence of magnetoresistance is explained by the interplay between the applied magnetic field and the (exponential tail of the) induced exchange field in YBCO, the latter originating from the electronic reconstruction at the LCMO/YBCO interfaces.', '[Liu, Yaohua; Zhu, L. Y.; Hoffmann, A.; te Velthuis, S. G. E.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA; [Visani, C.; Nemes, N. M.; Tornos', 'Liu, YH (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA.', 'yhliu@anl.gov; tevelthuis@anl.gov', 'U. S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-06CH11357]; Spanish MICINN ', 'We thank S. Okamoto and J. Salafranca for valuable discussions. Research at Argonne National Laboratory was supported by the U. S. Department of Energ', 'Brinkman A, 2007, NAT MATER, V6, P493, DOI 10.1038/nmat1931; Buzdin AI, 1999, EUROPHYS LETT, V48, P686, DOI 10.1209/epl/i1999-00539-0; Chakhalian J, 2', '27', 8, 8, 'AMER PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '0031-9007', '', 'PHYS REV L', 'Phys. Rev.', 'MAY 18', '2012', '108', '20', '', '', '', '', '', '207205', '10.1103/PhysRevLett.108.207205', '', '5', '', 'Physi', 'Physi', '982TP', 'WOS:0', 0, 0),
(440, '', 'J', 'de Lucas, EA;Alvarez-Serrano, I;Cuello, GJ;Garcia-Hernandez, M;Lopez, ML;Pico, C;Veiga, ML;', 'Asensio de Lucas, E.; Alvarez-Serrano, I.; Cuello, G. J.; Garcia-Hernandez, M.; Lopez, M. L.; Pico, C.; Veiga, M. L.', '', '', '', '', 'Enhancement of localization phenomena driven by covalency in the SrBiMn1.75Ti0.25O6 manganite', 'JOURNAL OF ALLOYS AND COMPOUNDS', '', '', 'English', 'Article', '', '', '', '', '', 'Manganites; Bismuth; Charge ordering; Orbital ordering; Neutron diffraction', 'Manganites are materials that show remarkable phenomena related to charge orbital ordering (CO/OO) and it is extremely important to understand the fundamental nature of this behaviour. This paper reports on the structural, electronic and magnetic behaviour of the new SrBiMn1.75Ti0.25O6 manganite and the dependence of these properties with temperature. A detailed structural analysis has been carried out by electron, X-ray, neutron diffraction between 4 and 700 K. The electron diffraction patterns obtained at room temperature (RT) evidence that the average structure (a similar to b similar to root 2a(p) and c similar to 2ap) presents a modulation that doubles the a and c lattice parameters. A very high charge ordering (CO) transition temperature of 510 K, similar to that found for the non-doped material, SrBiMn2O6, is observed. Above this temperature the symmetry changes from orthorhombic to tetragonal. The conductivity and susceptibility data show a strong interdependence with the structural transition. The activation energy decreases from 0.24 eV to 0.12 eV below and above 510 K, respectively. On the other hand, the high value of the magnetic moment (mu(eff) = 9.34 mu(B)), observed between 300 and 500 K, is interpreted in terms of the existence of Mn-4 magnetic clusters. Finally, extra maxima appearing in neutron diffraction patterns at lower temperatures are interpreted considering the stabilization of AFM interactions, consistent with an A-type magnetic ordering. The results are discussed in the framework of charge ordering/orbital ordering and cluster models. (C) 2012 Elsevier B. V. All rights reserved.', '[Asensio de Lucas, E.; Alvarez-Serrano, I.; Lopez, M. L.; Pico, C.; Veiga, M. L.] Univ Complutense Madrid, Fac Ciencias Quim, Depto Quim Inorgan 1, E-', 'Lopez, ML (reprint author), Univ Complutense Madrid, Fac Ciencias Quim, Depto Quim Inorgan 1, E-28040 Madrid, Spain.', 'marisal@quim.ucm.es', 'Spanish Ministerio de Ciencia e Innovacion [MAT2010-20117]', 'We acknowledge financial support from Spanish Ministerio de Ciencia e Innovacion - Grant MAT2010-20117. Authors are grateful to the ILL and CAI center', 'Biskup N, 2005, PHYS REV B, V72, DOI 10.1103/PhysRevB.72.024115; Borges RP, 1999, PHYS REV B, V60, P12847, DOI 10.1103/PhysRevB.60.12847; Coey M. D., ', '33', 2, 2, 'ELSEVIER SCIENCE SA', 'LAUSANNE', 'PO BOX 564, 1001 LAUSANNE, SWITZERLAND', '0925-8388', '', 'J ALLOY CO', 'J. Alloy. ', 'MAY 5', '2012', '522', '', '', '', '', '123', '129', '', '10.1016/j.jallcom.2012.01.124', '', '7', '', 'Chemi', 'Chemi', '901GR', 'WOS:0', 0, 0),
(441, '', 'J', 'Guardia, P;Di Corato, R;Lartigue, L;Wilhelm, C;Espinosa, A;Garcia-Hernandez, M;Gazeau, F;Manna, L;Pellegrino, T;', 'Guardia, Pablo; Di Corato, Riccardo; Lartigue, Lenaic; Wilhelm, Claire; Espinosa, Ana; Garcia-Hernandez, Mar; Gazeau, Florence; Manna, Liberato; Pellegrino, Teresa', '', '', '', '', 'Water-Soluble Iron Oxide Nanocubes with High Values of Specific Absorption Rate for Cancer Cell Hyperthermia Treatment', 'ACS NANO', '', '', 'English', 'Article', '', '', '', '', '', 'hyperthermia treatment; specific absorption rate; SAR values; iron oxide nanoparticles; magnetic nanoparticles; biomedical applications; magnetosome-l', 'Iron oxide nanoaystals (IONCs) are appealing heat mediator nanoprobes in magnetic-mediated hyperthermia for cancer treatment Here, specific absorption rate (SAR) values are reported for cube-shaped water-soluble IONCs prepared by a one-pot synthesis approach in a size range between 13 and 40 nm. The SAR values were determined as a function of frequency and magnetic field applied, also spanning technical conditions which are considered biomedically safe for patients. Among the different sizes tested, IONCs with an average diameter of 19 +/- 3 nm had significant SAR values in clinical conditions and reached SAR values up to 2452 W/g(Fe) at 520 kHz and 29 kAm(-1), which is one of the highest values so far reported for IONCs. In vitro trials carried out on KB cancer cells treated with IONCs of 19 nm have shown efficient hyperthermia performance, With cell mortality of about 50% recorded when an equilibrium temperature of 43 degrees C was reached after 1 h of treatment.', '[Guardia, Pablo; Di Corato, Riccardo; Manna, Liberato; Pellegrino, Teresa] Ist Italiano Tecnol, I-16163 Genoa, Italy; [Di Corato, Riccardo; Pellegrino', 'Pellegrino, T (reprint author), Ist Italiano Tecnol, Via Morego 30, I-16163 Genoa, Italy.', 'teresa.pellegrino@iit.it', 'European project Magnifyco [NMP4-SL-2009-228622]', 'This work was supported by the European project Magnifyco (Contract NMP4-SL-2009-228622). We thank Simone Nitti and Giammarino Pugliese for help with ', 'Alphandery E, 2011, J PHYS CHEM C, V115, P18, DOI 10.1021/jp104580t; Alphandery E, 2011, ACS NANO, V5, P6279, DOI 10.1021/nn201290k; Bazylinski DA, 20', '57', 81, 81, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '1936-0851', '', 'ACS NANO', 'ACS Nano', 'APR', '2012', '6', '4', '', '', '', '3080', '3091', '', '10.1021/nn2048137', '', '12', '', 'Chemi', 'Chemi', '929XP', 'WOS:0', 0, 0),
(442, '', 'J', 'Guglieri, C;Laguna-Marco, MA;Garcia, MA;Carmona, N;Cespedes, E;Garcia-Hernandez, M;Espinosa, A;Chaboy, J;', 'Guglieri, C.; Laguna-Marco, M. A.; Garcia, M. A.; Carmona, N.; Cespedes, E.; Garcia-Hernandez, M.; Espinosa, A.; Chaboy, J.', '', '', '', '', 'XMCD Proof of Ferromagnetic Behavior in ZnO Nanoparticles', 'JOURNAL OF PHYSICAL CHEMISTRY C', '', '', 'English', 'Article', '', '', '', '', '', '', 'The combined element-specific X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) study of ZnO nanoparticles (NPs) capped with organic molecules confirms the occurrence of intrinsic ferromagnetic-like (FML) behavior up to room temperature (HTFM). Zn K-edge XMCD measurements reveal the coexistence of two different magnetic contributions: a paramagnetic response from the core of the NP, and a ferromagnetic-like contribution stemming from the interface formed between the ZnO core of the NP and the organic molecule. The extent and conformation of this interface depends on the capping molecule, and as demonstrated in ZnO/ZnS heterostructures, the FML behavior is reinforced when neat interfaces are formed.', '[Guglieri, C.; Chaboy, J.] Univ Zaragoza, Inst Ciencia Mat Aragon, Consejo Super Invest Cient, E-50009 Zaragoza, Spain; [Guglieri, C.; Chaboy, J.] Uni', 'Guglieri, C (reprint author), Univ Zaragoza, Inst Ciencia Mat Aragon, Consejo Super Invest Cient, E-50009 Zaragoza, Spain.', '', 'Madrid Government [S2009/MAT-1726]; Ministerio de Eduacion y Ciencia of Spain; Ministerio de Ciencia e Innovacion of Spain; FSE-MEC; Ramon y Cajal pro', 'This work was partially supported by Spanish MAT2008-06542-C04-01, MAT-2010-16022, MAT2010-09346-E, MAT2011-27573-C04-04, MAT2011-27470-C02-02, FIS-20', 'Munoz MC, 2011, J PHYS CONF SER, V303, DOI 10.1088/1742-6596/303/1/012001; Cespedes E, 2011, J PHYS CHEM C, V115, P24092, DOI 10.1021/jp208929w; Chabo', '25', 19, 19, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '1932-7447', '', 'J PHYS CHE', 'J. Phys. C', 'MAR 22', '2012', '116', '11', '', '', '', '6608', '6614', '', '10.1021/jp300837f', '', '7', '', 'Chemi', 'Chemi', '912AW', 'WOS:0', 1, 0),
(443, '', 'J', 'Ziese, M;Esquinazi, PD;Pantel, D;Alexe, M;Nemes, NM;Garcia-Hernandez, M;', 'Ziese, M.; Esquinazi, P. D.; Pantel, D.; Alexe, M.; Nemes, N. M.; Garcia-Hernandez, M.', '', '', '', '', 'Magnetite (Fe3O4): a new variant of relaxor multiferroic?', 'JOURNAL OF PHYSICS-CONDENSED MATTER', '', '', 'English', 'Article', '', '', '', '', '', '', 'The electric polarization, dielectric permittivity, magnetoelectric effect, heat capacity, magnetization and ac susceptibility of magnetite films and polycrystals were investigated. The electric polarization of magnetite films with saturation values between 4 and 8 mu C cm(-2) was found to vanish between 32 and 38 K, but in polycrystals no phase transition was detected in this range by heat capacity. Both types of samples showed magnetoelectric effects at low temperatures below a frequency-dependent crossover. This is interpreted as arising from multiferroic relaxor behavior.', '[Ziese, M.; Esquinazi, P. D.] Univ Leipzig, Fac Phys & Geosci, Div Superconduct & Magnetism, D-04103 Leipzig, Germany; [Pantel, D.; Alexe, M.] Max Pla', 'Ziese, M (reprint author), Univ Leipzig, Fac Phys & Geosci, Div Superconduct & Magnetism, D-04103 Leipzig, Germany.', 'ziese@physik.uni-leipzig.de', 'DFG within the Collaborative Research Center [SFB 762]; Spanish MICINN [MAT2008-06517-C02-01, CSD2009 00013]', 'This work was supported by the DFG within the Collaborative Research Center SFB 762 ''Functionality of Oxide Interfaces'' and by the Spanish MICINN proj', 'Alexe M, 2009, ADV MATER, V21, P4452, DOI 10.1002/adma.200901381; ANDERSON PW, 1956, PHYS REV, V102, P1008, DOI 10.1103/PhysRev.102.1008; ARAI KI, 197', '73', 12, 12, 'IOP PUBLISHING LTD', 'BRISTOL', 'TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND', '0953-8984', '', 'J PHYS-CON', 'J. Phys.-C', 'FEB 29', '2012', '24', '8', '', '', '', '', '', '086007', '10.1088/0953-8984/24/8/086007', '', '8', '', 'Physi', 'Physi', '896QW', 'WOS:0', 0, 0),
(444, '', 'J', 'Alvarez-Serrano, I;Lopez, ML;Rubio, F;Garcia-Hernandez, M;Cuello, GJ;Pico, C;Veiga, ML;', 'Alvarez-Serrano, Inmaculada; Luisa Lopez, M.; Rubio, Fausto; Garcia-Hernandez, Mar; Cuello, Gabriel J.; Pico, Carlos; Luisa Veiga, M.', '', '', '', '', 'Non-symmetric superparamagnetic clusters in the relaxor manganites Sr2-xBixMnTiO6 (0 <= x <= 0.75)', 'JOURNAL OF MATERIALS CHEMISTRY', '', '', 'English', 'Article', '', '', '', '', '', '', 'The structural, microstructural, electrical and magnetic characterization of microcrystalline powders of new Ti manganites Sr2-xBixMnTiO6 (0 <= x <= 0.75) is reported. Compositional characterization by means of EDS and XPS confirms the stoichiometry of all samples to be practically equal to the nominal ones. Neutron and X-ray diffraction data show that all the samples crystallize with cubic symmetry, space group Pm (3) over barm, which is broken at the nanoscale as Raman spectroscopy and HRTEM/ED analysis suggest. The complex magnetic response is interpreted by considering the magnetic frustration derived from the presence of structural and atomic disorder; initial AFM behavior evolves to FM predominant interactions as x increases and superparamagnetic clusters stabilize above T-c. The variation of the permittivity with temperature for x >= 0.50, obtained from impedance measurements, seems to be related to a relaxor-type ferroelectric behaviour. The title materials could be regarded as a potential local multiferroic system, given that both the FE and FM responses seem to be dependent on the formation and development of BiMO3-type clusters, and therefore they are correlated.', '[Alvarez-Serrano, Inmaculada; Luisa Lopez, M.; Pico, Carlos; Luisa Veiga, M.] Univ Complutense, Dpto Quim Inorgan 1, Fac Ciencias Quim, E-28040 Madrid', 'Alvarez-Serrano, I (reprint author), Univ Complutense, Dpto Quim Inorgan 1, Fac Ciencias Quim, E-28040 Madrid, Spain.', 'ias@quim.ucm.es; frubio@icv.csic.es; marmar@icmm.c', '', '', 'Abrashev MV, 2002, PHYS REV B, V65, DOI 10.1103/PhysRevB.65.184301; Alonso-Dominguez D, 2011, MATER CHEM PHYS, V130, P280, DOI 10.1016/j.matchemphys.2', '39', 2, 2, 'ROYAL SOC CHEMISTRY', 'CAMBRIDGE', 'THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND', '0959-9428', '', 'J MATER CH', 'J. Mater. ', '', '2012', '22', '23', '', '', '', '11826', '11835', '', '10.1039/c2jm30670k', '', '10', '', 'Chemi', 'Chemi', '946KV', 'WOS:0', 0, 0),
(445, '', 'J', 'Espinosa, A;Serrano, A;Llavona, A;de la Morena, JJ;Abuin, M;Figuerola, A;Pellegrino, T;Fernandez, JF;Garcia-Hernandez, M;Castro, GR;Garcia, MA;', 'Espinosa, A.; Serrano, A.; Llavona, A.; Jimenez de la Morena, J.; Abuin, M.; Figuerola, A.; Pellegrino, T.; Fernandez, J. F.; Garcia-Hernandez, M.; Castro, G. R.; Garcia, M. A.', '', '', '', '', 'On the discrimination between magnetite and maghemite by XANES measurements in fluorescence mode', 'MEASUREMENT SCIENCE & TECHNOLOGY', '', '', 'English', 'Article', '', '', '', '', '', 'iron oxides; x-ray absorption; self-absorption', 'We discuss here the quantification of magnetite and maghemite from x-ray absorption near edge spectroscopy at the Fe K-edge in fluorescence mode. We show that the modification of the spectral shape due to self-absorption effects can lead to erroneous results for certain thicknesses. However, for homogeneous samples containing just magnetite and maghemite without other phases, the quantification of magnetite and maghemite can be obtained from the spectra measured in fluorescence mode without correcting the spectra for the self-absorption effects. We describe the conditions to carry on this analysis that requires measuring the reference compounds exactly under the same conditions as the studied samples and using the appropriate thickness.', '[Serrano, A.; Jimenez de la Morena, J.; Fernandez, J. F.; Garcia, M. A.] Inst Ceram & Vidrio ICV CSIC, Madrid 28049, Spain; [Espinosa, A.; Garcia-Hern', 'Garcia, MA (reprint author), Inst Ceram & Vidrio ICV CSIC, Madrid 28049, Spain.', 'magarcia@icv.csic.es', 'European project MAGNIFYCO [NMP4-SL-2009-228622]; Spanish Ministry of Science and innovation [FIS-2008-06249, MAT2010-C21088-C03, MAT2008-06517-C02-01', 'Normalized XAS Normalized XAS The authors acknowledge the European Synchrotron Radiation Facility for provision of synchrotron radiation facilities an', 'Borse PH, 2008, APPL PHYS LETT, V93, DOI 10.1063/1.3005557; Carboni R, 2005, PHYS SCRIPTA, VT115, P986; Castaner R, 1997, J PHYS III, V7, P337, DOI 10', '19', 17, 17, 'IOP PUBLISHING LTD', 'BRISTOL', 'TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND', '0957-0233', '', 'MEAS SCI T', 'Meas. Sci.', 'JAN', '2012', '23', '1', '', '', '', '', '', '015602', '10.1088/0957-0233/23/1/015602', '', '6', '', 'Engin', 'Engin', '864KZ', 'WOS:0', 0, 0),
(446, '', 'J', 'Arcos, D;Fal-Miyar, V;Ruiz-Hernandez, E;Garcia-Hernandez, M;Ruiz-Gonzalez, ML;Gonzalez-Calbet, J;Vallet-Regi, M;', 'Arcos, Daniel; Fal-Miyar, Vanesa; Ruiz-Hernandez, Eduardo; Garcia-Hernandez, Mar; Luisa Ruiz-Gonzalez, M.; Gonzalez-Calbet, Jose; Vallet-Regi, Maria', '', '', '', '', 'Supramolecular mechanisms in the synthesis of mesoporous magnetic nanospheres for hyperthermia', 'JOURNAL OF MATERIALS CHEMISTRY', '', '', 'English', 'Article', '', '', '', '', '', '', 'The present work deals with the preparation of magnetic mesoporous nanocomposites with potential application for cancer treatment. The supramolecular mechanisms that govern the incorporation of gamma-Fe(2)O(3) nanoparticles into mesoporous silica spheres have been deeply analyzed. The modification of gamma-Fe(2)O(3) nanoparticles during the encapsulation into mesoporous SiO(2) has been studied. The alkaline conditions of these processes lead to an enlargement of maghemite nanoparticles. We hypothesize that this particle enlargement results from Fe(3+) cations present in solution. The results presented in this work indicate the importance of the appropriate surface functionalization to incorporate nanosystems into mesoporous silica materials, as well as the modifications that magnetic nanoparticles undergo during the process. Finally, the ability to produce magnetic hyperthermia makes this material a very promising candidate for multifunctional thermoseeds for cancer treatment.', '[Arcos, Daniel; Fal-Miyar, Vanesa; Ruiz-Hernandez, Eduardo; Vallet-Regi, Maria] Univ Complutense Madrid, Fac Farm, Dept Quim Inorgan & Bioinorgan, E-2', 'Vallet-Regi, M (reprint author), Univ Complutense Madrid, Fac Farm, Dept Quim Inorgan & Bioinorgan, E-28040 Madrid, Spain.', 'vallet@farm.ucm.es', 'Spanish CICYT [MAT2008-00736]; CAM [S2009/MAT-1472]', 'This work was supported by the Spanish CICYT through the project MAT2008-00736 and by the CAM through project S2009/MAT-1472. We thank C. Aroca (ISOM,', 'Balas F, 2006, J AM CHEM SOC, V128, P8116, DOI 10.1021/ja062286z; Boissiere C, 2011, ADV MATER, V23, P599, DOI 10.1002/adma.201001410; Castanotto D, 2', '49', 11, 11, 'ROYAL SOC CHEMISTRY', 'CAMBRIDGE', 'THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND', '0959-9428', '', 'J MATER CH', 'J. Mater. ', '', '2012', '22', '1', '', '', '', '64', '72', '', '10.1039/c1jm13102h', '', '9', '', 'Chemi', 'Chemi', '855XA', 'WOS:0', 0, 0),
(447, '', 'J', 'Torres, M;Ricote, J;Amorin, H;Jaafar, M;Holgado, S;Piqueras, J;Asenjo, A;Garcia-Hernandez, M;Alguero, M;', 'Torres, Maria; Ricote, Jesus; Amorin, Harvey; Jaafar, Miriam; Holgado, Susana; Piqueras, Juan; Asenjo, Agustina; Garcia-Hernandez, Mar; Alguero, Miguel', '', '', '', '', 'Multiferroic nanoparticulate thin film composites by Co implantation of ferroelectric Pb(Mg1/3Nb2/3)O-3-PbTiO3 single crystal targets', 'JOURNAL OF PHYSICS D-APPLIED PHYSICS', '', '', 'English', 'Article', '', '', '', '', '', '', 'Two-phase magnetostrictive-piezoelectric thin film composites are key materials to the development of a range of potentially disruptive magnetoelectric technologies, such as electrical-writing magnetic-reading random access memories. However, multiferroic thin film composites prepared so far show neither magnetoelectric switching nor magnetoelectric responses comparable to those of related bulk ceramic materials and cermets. Here we show that ion implantation of magnetic species into ferroelectric single crystal targets can be an effective alternative means of obtaining nanoparticulate thin film composites of this type. Concept is proved by the implantation of Co into a Pb(Mg1/3Nb2/3)O-3-PbTiO3 single crystal with ultrahigh piezoelectricity. Formation of an ensemble of ferromagnetic nanoparticles embedded in an amorphized layer within the ferroelectric crystal is clearly shown.', '[Torres, Maria; Ricote, Jesus; Amorin, Harvey; Asenjo, Agustina; Garcia-Hernandez, Mar; Alguero, Miguel] Consejo Super Invest Cient, Inst Ciencia Mat ', 'Torres, M (reprint author), Consejo Super Invest Cient, Inst Ciencia Mat Madrid, Madrid 28049, Spain.', 'malguero@icmm.csic.es', 'MICINN (Spain) [MAT2009-07551-E]; European Community under EC [227012]', 'Funded by MICINN (Spain) through the EXPLORA Programme (ref. MAT2009-07551-E). Reseach has also been supported by the European Community as an Integra', 'Akdogan N, 2009, J APPL PHYS, V105, DOI 10.1063/1.3082080; Alexe M., 2003, NANOSCALE CHARACTERI; ASPNES DE, 1984, PHYS REV B, V29, P768, DOI 10.1103/P', '32', 2, 2, 'IOP PUBLISHING LTD', 'BRISTOL', 'TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND', '0022-3727', '', 'J PHYS D A', 'J. Phys. D', 'DEC 14', '2011', '44', '49', '', '', '', '', '', '495306', '10.1088/0022-3727/44/49/495306', '', '10', '', 'Physi', 'Physi', '862GS', 'WOS:0', 0, 0),
(448, '', 'J', 'Rivera-Calzada, A;Diaz-Guillen, MR;Dura, OJ;Sanchez-Santolino, G;Pennycook, TJ;Schmidt, R;Bruno, FY;Garcia-Barriocanal, J;Sefrioui, Z;Nemes, NM;Garcia-Hernandez, M;Varela, M;Leon, C;Pantelides, ST;Pennycook, SJ;Santamaria, J;', 'Rivera-Calzada, A.; Diaz-Guillen, M. R.; Dura, O. J.; Sanchez-Santolino, G.; Pennycook, T. J.; Schmidt, R.; Bruno, F. Y.; Garcia-Barriocanal, J.; Sefrioui, Z.; Nemes, N. M.; Garcia-Hernandez, M.; Varela, M.; Leon, C.; Pantelides, S. T.; Pennycook, S.', '', '', '', '', 'Tailoring Interface Structure in Highly Strained YSZ/STO Heterostructures', 'ADVANCED MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'epitaxy; thin films; charge transport; structure-property relationships', 'Heterostructures combining transition metal oxides, as compared to other materials, are able to accommodate very large amounts of epitaxial strain without breaking into islands or structural domains. Coherently strained interfaces are an interesting playground for the search of materials with enhanced ion diffusivities, of interest in devices for energy generation and storage. In this work we highlight the importance of the interface structure of highly strained YSZ/STO superlattices in determining an enhancement of their ionic conductivity. We show the role of growth orientation in controlling the structure and morphology of the interface. Results of density functional theory calculations are discussed, showing that the incompatibility of the oxygen positions at the interface planes plays a key role in stabilizing the high values of ionic conductivities.', '[Pantelides, S. T.; Pennycook, S. J.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA; [Rivera-Calzada, A.; Diaz-Guillen, M. R.; Dura, O.', 'Pantelides, ST (reprint author), Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA.', 'pantelides@Vanderbilt.Edu; pennycooksj@ornl.gov; j', 'Spanish MICINN [MAT 2008 06517, CSD2009-00013, CAM S2009-MAT 1756]; European Research Council; Materials Sciences and Engineering Division, Office of ', 'Work at UCM supported by Spanish MICINN Grant MAT 2008 06517, Consolider Ingenio CSD2009-00013 (IMAGINE), CAM S2009-MAT 1756 (PHAMA) and the European ', 'Bosman M, 2006, ULTRAMICROSCOPY, V106, P1024, DOI 10.1016/j.ultramic.2006.04.016; Bousquet E, 2008, NATURE, V452, P732, DOI 10.1038/nature06817; Brink', '35', 14, 14, 'WILEY-BLACKWELL', 'MALDEN', 'COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA', '0935-9648', '', 'ADV MATER', 'Adv. Mater', 'NOV 23', '2011', '23', '44', 'SI', '', '', '5268', '5274', '', '10.1002/adma.201102106', '', '7', '', 'Chemi', 'Chemi', '849XE', 'WOS:0', 0, 0),
(449, '', 'J', 'Alonso-Dominguez, D;Alvarez-Serrano, I;Cuello, G;Garcia-Hernandez, M;Lopez, ML;Pico, C;Veiga, ML;', 'Alonso-Dominguez, D.; Alvarez-Serrano, I.; Cuello, G.; Garcia-Hernandez, M.; Lopez, M. L.; Pico, C.; Veiga, M. L.', '', '', '', '', 'Tuning magnetic critical behaviour in Ti-manganites by doping with vacancies in A-sites: Sr1-x square xLaMnTiO6-delta (0 < x <= 0.15)', 'MATERIALS CHEMISTRY AND PHYSICS', '', '', 'English', 'Article', '', '', '', '', '', 'Oxides; Magnetic properties; Neutron scattering and diffraction; Ceramics', 'Microcrystalline powders of Sr1-x square xLaMnTiO6-delta (0 < x <= 0.15) perovskites have been synthesized by the sol-gel method. Structural characterization from neutron diffraction data shows tetragonal symmetry for all samples in the whole temperature range explored (5-700 K) and HRTEM analysis confirms it at the micro scale. Structural refinements suggest that Sr/La and Mn/Ti cations are placed at random in A and B sublattices, respectively, being the vacancies exclusively located on the former sites. Doping with vacancies in the A sites does not provoke any extra structural ordering or distortion but modifies the electronic scenario at the B-sites, leading to an enhancement of Griffiths phase as the amount of vacancies, x, increases. Semiconductor behaviour has been observed, without any transition to metallic state, with typical activation energies of 0.15 eV. The intrinsic magnetic frustrated behaviour is described in terms of a cluster-glass model. (C) 2011 Elsevier B.V. All rights reserved.', '[Alonso-Dominguez, D.; Alvarez-Serrano, I.; Lopez, M. L.; Pico, C.; Veiga, M. L.] Univ Complutense Madrid, Fac Ciencias Quim, Dpto Quim Inorgan 1, E-2', 'Alonso-Dominguez, D (reprint author), Univ Complutense Madrid, Fac Ciencias Quim, Dpto Quim Inorgan 1, E-28040 Madrid, Spain.', 'danielad@quim.ucm.es', 'Spanish Ministerio de Ciencia e Innovacion [MAT2010-20117]', 'We acknowledge financial support from Spanish Ministerio de Ciencia e Innovacion - MAT2010-20117. Authors are grateful to the CAI Centers of UCM (XRD ', 'Alvarez-Serrano I, 2007, J PHYS D APPL PHYS, V40, P3016, DOI 10.1088/0022-3727/40/10/001; Alvarez-Serrano I, 2006, SOLID STATE SCI, V8, P37, DOI 10.10', '24', 2, 2, 'ELSEVIER SCIENCE SA', 'LAUSANNE', 'PO BOX 564, 1001 LAUSANNE, SWITZERLAND', '0254-0584', '', 'MATER CHEM', 'Mater. Che', 'OCT 17', '2011', '130', '1-2', '', '', '', '280', '284', '', '10.1016/j.matchemphys.2011.06.064', '', '5', '', 'Mater', 'Mater', '829RJ', 'WOS:0', 0, 0),
(450, '', 'J', 'Levy, M;Quarta, A;Espinosa, A;Figuerola, A;Wilhelm, C;Garcia-Hernandez, M;Genovese, A;Falqui, A;Alloyeau, D;Buonsanti, R;Cozzoli, PD;Garcia, MA;Gazeau, F;Pellegrino, T;', 'Levy, Michael; Quarta, Alessandra; Espinosa, Ana; Figuerola, Albert; Wilhelm, Claire; Garcia-Hernandez, Mar; Genovese, Alessandro; Falqui, Andrea; Alloyeau, Damien; Buonsanti, Raffaella; Davide Cozzoli, Pantaleo; Angel Garcia, Miguel; Gazeau, Florenc', '', '', '', '', 'Correlating Magneto-Structural Properties to Hyperthermia Performance of Highly Monodisperse Iron Oxide Nanoparticles Prepared by a Seeded-Growth Rout', 'CHEMISTRY OF MATERIALS', '', '', 'English', 'Article', '', '', '', '', '', 'iron oxide nanoparticles; thermodecomposition colloidal synthesis; seeded-growth; hyperthermia; magnetic properties; antiphase boundaries; strain anal', 'Monodisperse cubic spinet iron oxide magnetic nanoparticles with variable sizes were prepared following a multi-injection seeded-growth approach. As expected from such a well-known synthetic route, all samples were characterized by narrow size distributions, and showed excellent stability in both organic and aqueous media without the presence of aggregates, thus becoming ideal candidates for the study of their hyperthermia performance. Specific Loss Power measurements indicated low heating powers for all samples without a maximum for any specific size, contrary to what theory predicts. The magnetic study showed the formation of size-dependent nonsaturated magnetic regions, which enlarged with the particle size, evidencing a clear discrepancy between the crystal size and the effective magnetic volume. Strain map analysis of high resolution transmission electron micrographs indicated the presence of highly strained crystal areas even if nanoparticles were monocrystalline. The origin of the crystal strain was found to be strictly correlated with the seeded-growth synthetic procedure used for the preparation of the nanoparticles, which turned out to alter their magnetic structure by creating antiphase boundaries. Considering the calculated effective magnetic volumes and their magnetic dispersions in each sample, a reasonable agreement between hyperthermia experiments and theory was obtained.', '[Figuerola, Albert; Genovese, Alessandro; Falqui, Andrea; Pellegrino, Teresa] Ist Italiano Tecnol, I-16169 Genoa, Italy; [Levy, Michael; Wilhelm, Clai', 'Figuerola, A (reprint author), Ist Italiano Tecnol, Via Morego 30, I-16169 Genoa, Italy.', 'albert.figuerola@qi.ub.es; magarcia@icv.csic.es', 'European project Magnifyco [NMP4-SL-2009-228622]; Spanish Ministerio de Ciencia e Innovacion [CSD2009-00013, MAT2008-06517-C02-01, FIS-2008-06249]; Ma', 'This work was supported by the European project Magnifyco (Contract NMP4-SL-2009-228622), the Spanish Ministerio de Ciencia e Innovacion grants CSD200', 'Arora SK, 2005, J MAGN MAGN MATER, V286, P463, DOI 10.1016/j.jmmm.2004.09.066; BACRI JC, 1986, J MAGN MAGN MATER, V62, P36, DOI 10.1016/0304-8853(86)9', '66', 43, 43, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0897-4756', '', 'CHEM MATER', 'Chem. Mat.', 'SEP 27', '2011', '23', '18', '', '', '', '4170', '4180', '', '10.1021/cm201078f', '', '11', '', 'Chemi', 'Chemi', '822OS', 'WOS:0', 0, 0),
(451, '', 'J', 'Villafuerte-Castrejon, ME;Garcia-Guaderrama, M;Fuentes, L;Prado-Gonjal, J;Gonzalez, AM;de la Rubia, MA;Garcia-Hernandez, M;Moran, E;', 'Villafuerte-Castrejon, M. E.; Garcia-Guaderrama, M.; Fuentes, L.; Prado-Gonjal, J.; Gonzalez, A. M.; de la Rubia, M. A.; Garcia-Hernandez, M.; Moran, E.', '', '', '', '', 'New Fe3+/Cr3+ Perovskites with Anomalous Transport Properties: The Solid Solution LaxBi1-xFe0.5Cr0.5O3 (0.4 <= x <= 1)', 'INORGANIC CHEMISTRY', '', '', 'English', 'Article', '', '', '', '', '', '', 'In this work, the sol gel synthesis, structural characterization, and transport properties of a new solid solution of the general formula LaxBi1-xFe0.5Cr0.5O3 (0.4 <= x <= 1) are presented. The solubility limit x has been determined and variation of the lattice parameters measured through profile fitting. The cell parameters, space group, and atomic positions, as obtained by the Rietveld refinement of X-ray diffraction data, are reported. This analysis and electron diffraction studies as well do not reveal any evidence of Fe/Cr ordering. Regarding the transport properties, magnetic and electric characterizations are described. The electrical response with the temperature and frequency has been studied, and a "positive temperature coefficient" for the resistivity has been found for temperatures between 270 and 400 degrees C. The magnetic behavior is striking because, for all materials studied, zero-field-cooling curves appear above field-cooling ones, an anomalous feature that is interpreted as being due to complex ferromagnetic/antiferromagnetic interactions in the B perovskite sublattice.', '[Villafuerte-Castrejon, M. E.; Fuentes, L.; Prado-Gonjal, J.; Moran, E.] UCM, Fac Ciencias Quim, Dept Quim Inorgan, Madrid 28040, Spain; [Villafuerte-', 'Moran, E (reprint author), UCM, Fac Ciencias Quim, Dept Quim Inorgan, Madrid 28040, Spain.', 'emoran@quim.ucm.es', 'PAPIIT-UNAM Project [IN116610-3]; UPM Project [AL08-P(I+D)-20]; Spanish Ministery for Science [MAT-2007-64006, CSD2009-00013, MAT2008-06517-C02-01]; C', 'M.E.V. is indebted to DGAPA, UNAM, for granting her a sabbatical year at the Universidad Complutense in Madrid. Financial support from different proje', 'Andreasson J, 2007, PHYS REV B, V75, DOI 10.1103/PhysRevB.75.104302; Azad AK, 2005, MATER RES BULL, V40, P1633, DOI 10.1016/j.materresbull.2005.07.007', '26', 4, 4, 'AMER CHEMICAL SOC', 'WASHINGTON', '1155 16TH ST, NW, WASHINGTON, DC 20036 USA', '0020-1669', '', 'INORG CHEM', 'Inorg. Che', 'SEP 5', '2011', '50', '17', '', '', '', '8340', '8347', '', '10.1021/ic2008864', '', '8', '', 'Chemi', 'Chemi', '811UX', 'WOS:0', 0, 0),
(452, '', 'J', 'Sierra, JF;Pryadun, VV;Russek, SE;Garcia-Hernandez, M;Mompean, F;Rozada, R;Chubykalo-Fesenko, O;Snoeck, E;Miao, GX;Moodera, JS;Aliev, FG;', 'Sierra, J. F.; Pryadun, V. V.; Russek, S. E.; Garcia-Hernandez, M.; Mompean, F.; Rozada, R.; Chubykalo-Fesenko, O.; Snoeck, E.; Miao, G. X.; Moodera, J. S.; Aliev, F. G.', '', '', '', '', 'Interface and Temperature Dependent Magnetic Properties in Permalloy Thin Films and Tunnel Junction Structures', 'JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY', '', '', 'English', 'Article', '', '', '', '', '', 'Magnetic Thin Films; Ferromagnetic Resonance; Thermally Induced Spin Reorientation Transition', 'Magnetization dynamics and field dependent magnetization of different devices based on 25-30 nm thick Permalloy (Py) films: such as single Py layers (Py/MgO; Py/CoFeB/Al(2)O(3)) and Py inserted as a magnetic layer in magnetic tunnel junctions (Py/CoFe/Al(2)O(3)/CoFe; Py/CoFeB/Al(2)O(3)/CoFe; Py/MgO/Fe) have been extensively studied within a temperature range between 300 K down to 5 K. The dynamic response was investigated in the linear regime measuring the ferromagnetic resonance response of the Py layers using broadband vector network analyzer technique. Both the static and the dynamic properties suggest the possible presence of a thermally induced spin reorientation transition in the Py interface at temperatures around 60 K in all the samples investigated. It seems, however, that the details of the interface between Py and the hardening ferromagnet/insulator structure, the atomic structure of Py layers (amorphous vs. textured) as well as the presence of dipolar coupling through the insulating barrier in the magnetic tunnel junction structures could strongly influence this low temperature reorientation transition. Our conclusions are indirectly supported by structural characterization of the samples by means of X-Ray diffraction and high resolution transmission electron microscopy techniques. Micromagnetic simulations indicate the possibility of strongly enhanced surface anisotropy in thin Py films over CoFe or CoFeB underlayers. Comparison of the simulations with experimental results also shows that the thermally-induced spin reorientation transition could be influenced by the presence of strong disorder at the surface.', '[Sierra, J. F.; Pryadun, V. V.; Aliev, F. G.] Univ Autonoma Madrid, Dept Fis Mat Condensada C 3, E-28049 Madrid, Spain; [Sierra, J. F.; Pryadun, V. V.', 'Sierra, JF (reprint author), CEA SPINTEC, 17 Rue Martyrs, F-38054 Grenoble, France.', '', 'Spanish MEC [MAT-2009-10139, MAT-2008-06517-C02-01, CSD-2009-00013, MAT2007-66719-C03-01]; Consolider [CSD2007-00010, CS2008-023]; Comunidad de Madrid', 'We thank M. J. Thornton for a critical reading of the manuscript. Authors acknowledge fruitful discussions with A. P. Levanyuk, V. Metlushko and F. Ga', 'Aliev FG, 2009, PHYS REV B, V79, DOI 10.1103/PhysRevB.79.174433; An SY, 2004, J APPL PHYS, V96, P1572, DOI 10.1063/1.1763996; ANDRE G, 1995, SURF SCI,', '38', 1, 1, 'AMER SCIENTIFIC PUBLISHERS', 'VALENCIA', '26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USA', '1533-4880', '', 'J NANOSCI ', 'J. Nanosci', 'SEP', '2011', '11', '9', '', '', '', '7653', '7664', '', '10.1166/jnn.2011.4754', '', '12', '', 'Chemi', 'Chemi', '837NG', 'WOS:0', 0, 0),
(453, '', 'J', 'Visani, C;Tornos, J;Nemes, NM;Rocci, M;Leon, C;Santamaria, J;te Velthuis, SGE;Liu, YH;Hoffmann, A;Freeland, JW;Garcia-Hernandez, M;Fitzsimmons, MR;Kirby, BJ;Varela, M;Pennycook, SJ;', 'Visani, C.; Tornos, J.; Nemes, N. M.; Rocci, M.; Leon, C.; Santamaria, J.; te Velthuis, S. G. E.; Liu, Yaohua; Hoffmann, A.; Freeland, J. W.; Garcia-Hernandez, M.; Fitzsimmons, M. R.; Kirby, B. J.; Varela, M.; Pennycook, S. J.', '', '', '', '', 'Symmetrical interfacial reconstruction and magnetism in La0.7Ca0.3MnO3/YBa2Cu3O7/La0.7Ca0.3MnO3 heterostructures', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'We have analyzed the interface structure and composition of La0.7Ca0.3MnO3/YBa2Cu3O7/La0.7Ca0.3MnO3 trilayers by combined polarized neutron reflectometry, aberration-corrected microscopy, and atomic column resolution electron-energy-loss spectroscopy and x-ray absorption with polarization analysis. We find the same stacking sequence at both top and bottom cuprate interfaces. X-ray magnetic circular dichroism experiments show that both cuprate interfaces are magnetic with a magnetic moment induced in Cu atoms as expected from symmetric Mn-O-Cu superexchange paths. These results supply a solid footing for the applicability of recent theories explaining the interplay between magnetism and superconductivity in this system in terms of the induced Cu spin polarization at both interfaces [J. Salafranca and S. Okamoto, Phys. Rev. Lett. 105, 256804 (2010)].', '[Visani, C.; Tornos, J.; Nemes, N. M.; Rocci, M.; Leon, C.; Santamaria, J.] Univ Complutense Madrid, Dept Fis Aplicada 3, GFMC, ES-28040 Madrid, Spain', 'Visani, C (reprint author), Univ Complutense Madrid, Dept Fis Aplicada 3, GFMC, Campus Moncloa, ES-28040 Madrid, Spain.', '', 'Spanish MICINN [MAT 2008 06517, CSD2009-00013, CAM S2009-MAT 1756]; European Research Council [239739]; U.S. Department of Energy, Office of Science [', 'Work at UCM was supported by Spanish MICINN Grant No. MAT 2008 06517, Consolider Ingenio CSD2009-00013 (IMAGINE), CAM S2009-MAT 1756 (PHAMA), and the ', 'Bergeret FS, 2005, REV MOD PHYS, V77, P1321, DOI 10.1103/RevModPhys.77.1321; Bosman M, 2006, ULTRAMICROSCOPY, V106, P1024, DOI 10.1016/j.ultramic.2006', '32', 14, 14, 'AMER PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '1098-0121', '', 'PHYS REV B', 'Phys. Rev.', 'AUG 23', '2011', '84', '6', '', '', '', '', '', '060405', '10.1103/PhysRevB.84.060405', '', '5', '', 'Physi', 'Physi', '811PN', 'WOS:0', 0, 0),
(454, '', 'J', 'Bruno, FY;Tornos, J;del Olmo, MG;Santolino, GS;Nemes, NM;Garcia-Hernandez, M;Mendez, B;Piqueras, J;Antorrena, G;Morellon, L;De Teresa, JM;Clement, M;Iborra, E;Leon, C;Santamaria, J;', 'Bruno, F. Y.; Tornos, J.; Gutierrez del Olmo, M.; Sanchez Santolino, G.; Nemes, N. M.; Garcia-Hernandez, M.; Mendez, B.; Piqueras, J.; Antorrena, G.; Morellon, L.; De Teresa, J. M.; Clement, M.; Iborra, E.; Leon, C.; Santamaria, J.', '', '', '', '', 'Anisotropic magnetotransport in SrTiO3 surface electron gases generated by Ar+ irradiation', 'PHYSICAL REVIEW B', '', '', 'English', 'Article', '', '', '', '', '', '', 'Metallic surface layers are fabricated by doping (100) SrTiO3 (STO) single crystals with oxygen vacancies generated by bombardment with Ar ions from an rf plasma source. The presence of oxygen vacancies is confirmed by cathodoluminescence and x-ray photoemission spectroscopy. This technique produces a surface electron gas with high values of the sheet carrier density (n(2D) = 2.45x10(17) cm(-2)). A strong increase (300%) of the low-temperature magnetoresistance is observed when the magnetic field is rotated away from the surface, characteristic of orbital effects of confined electrons. We estimate the width of the confinement region to be in the 200-300 nm range. When a magnetic field is applied in the surface plane and parallel to the current direction, a large negative magnetoresistance is found below the structural transition of the STO, which is discussed in terms of spin-orbit scattering. On further reduction of temperature, there is a change to a positive magnetoresistance regime due to the scattering of charge carriers at the disordered surface region.', '[Bruno, F. Y.; Tornos, J.; Gutierrez del Olmo, M.; Sanchez Santolino, G.; Nemes, N. M.; Leon, C.; Santamaria, J.] Univ Complutense Madrid, GFMC, Dept ', 'Bruno, FY (reprint author), Univ Complutense Madrid, GFMC, Dept Fis Aplicada 3, E-28040 Madrid, Spain.', '', 'Spanish MICINN [MAT 2008 06517]; Consolider Ingenio [CSD2009-00013]; CAM [S2009-MAT 1756]', 'This work was supported by Spanish MICINN Grant No. MAT 2008 06517, Consolider Ingenio Grant No. CSD2009-00013 (IMAGINE), and CAM Grant No. S2009-MAT ', 'Basletic M, 2008, NAT MATER, V7, P621, DOI 10.1038/nmat2223; Ben Shalom M, 2010, PHYS REV LETT, V104, DOI 10.1103/PhysRevLett.104.126802; Ben Shalom M', '41', 7, 7, 'AMER PHYSICAL SOC', 'COLLEGE PK', 'ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA', '1098-0121', '', 'PHYS REV B', 'Phys. Rev.', 'JUN 23', '2011', '83', '24', '', '', '', '', '', '245120', '10.1103/PhysRevB.83.245120', '', '8', '', 'Physi', 'Physi', '782CF', 'WOS:0', 0, 0),
