{"id":49,"date":"2011-12-27T11:49:55","date_gmt":"2011-12-27T10:49:55","guid":{"rendered":"http:\/\/www.icmm.csic.es\/matfuelcells\/?page_id=49"},"modified":"2011-12-27T11:49:55","modified_gmt":"2011-12-27T10:49:55","slug":"complex-perovskites-derived-from-cacu3mn4o12","status":"publish","type":"page","link":"https:\/\/wp.icmm.csic.es\/matfuelcells\/research-lines\/metastable-oxides\/complex-perovskites-derived-from-cacu3mn4o12\/","title":{"rendered":"Complex perovskites derived from CaCu3Mn4O12"},"content":{"rendered":"

\u00a0The CaCu3<\/sub>Mn4<\/sub>O12<\/sub> perovskite is a half-semiconducting and ferrimagnetic perovskite, with a TC<\/sub> = 360 K; it has been \u201crediscovered\u201d \u00a0upon description of a considerable MR at low field: at room temperature MR is almost saturated for magnetic fields as low as 0.03 T. Moreover, other novel compounds of this family have surprised the scientific community, for instance LaCu3<\/sub>Fe4<\/sub>O12<\/sub>, recently described in Nature. Its unique feature is the presence of an internal charge transfer effect between Cu cations, a the A positions, and Fe cations, at the B sites of the perovskite.<\/p>\n

The synthesis of this family of materials had been described, up to now, to proceed at 5-10 GPa; very recently we have prepared CaCu2.5<\/sub>Mn4.5<\/sub>O12<\/sub> at moderate pressures of 2 GPa, with comparable properties to those previously reported.<\/p>\n

Recent results of our group include: i) the preparation and study of Fe-substituted derivatives of LaCu3<\/sub>Mn4<\/sub>O12<\/sub>, studied by M\u00f6ssbauer spectroscopy and neutron diffraction, ii) the description of ferromagnetic behaviour in the La(Cu3-x<\/sub>Mnx<\/sub>)Mn4<\/sub>O12<\/sub> oxides and iii) the preparation and full characterization of ThCu3<\/sub>Mn4<\/sub>O12<\/sub>.<\/p>\n

On the other hand, we have checked that the replacement of Ca for La or other rare-earths in RCu3<\/sub>Mn4<\/sub>O12 <\/sub>has noticeable effects upon the increment of TC<\/sub>, besides observing a significant increase of the low-field MR, up to 3% at RT y 1 T. The peculiar magnetic structure of some members as TbCu3<\/sub>Mn4<\/sub>O12<\/sub> has also been studied by NPD.<\/p>\n

These results warrant the access to this family of oxides; the optimization of the MR properties and description of new derivatives are among the objectives of the present Research line.<\/p>\n

\"\"<\/a>
The internal pressure of the R3+ cations upon decreasing in size along the rare-earth series, from La to Lu accounts for the observed enhancement of TC, by 50 K: the compression of the MnO6 octahedral units improves the overlapping between Mn and O orbitals, thereby promoting superexchange.<\/figcaption><\/figure>\n

Recent Publications<\/strong><\/p>\n

Enhancement of the Curie Temperature along the Perovskite Series RCu3<\/sub>Mn4<\/sub>O12 Driven by Chemical Pressure of R3+ Cations (R = Rare Earths), Sanchez-Benitez, J, Alonso, JA, Martinez-Lope, MJ, de Andres, A, Fernandez-Diaz, MT, INORGANIC CHEMISTRY\u00a0 49, 5679-5685 (2010).<\/p>\n

Synthesis, magnetic properties, and neutron diffraction study of the complex perovskites R(Cu3-x<\/sub>Mnx<\/sub>)Mn4<\/sub>O12<\/sub> (R=Pr, Nd and x=1,2), Retuerto, M, Martinez-Lope, MJ, Sanchez-Benitez J., Garcia-Hernandez, M, Fernandez-Diaz, MT, Alonso, JA, JOURNAL OF APPLIED PHYSICS 108 (2010)<\/p>\n

Preparation at moderate pressures, crystal and magnetic structure and magnetotransport of the ferrimagnetic CeCu3<\/sub>Mn4<\/sub>O12<\/sub> perovskite, Sanchez-Benitez, J,\u00a0 Martinez-Lope, MJ, Alonso, JA, JOURNAL OF APPLIED PHYSICS\u00a0 107 (2010).<\/p>\n

Crystal and magnetic structures of the complex perovskites LaCu3<\/sub>(Mn4-x<\/sub>Fex<\/sub>)O12<\/sub> with colossal magnetoresistance,\u00a0 Sanchez-Benitez, J, Retuerto, M, Martinez-Lope, MJ, de la Calle, C, Fernandez-Diaz, MT, Alonso, JA, ZEITSCHRIFT FUR KRISTALLOGRAPHIE\u00a0 225,\u00a0 201- 208 (2010)<\/p>\n

High-pressure preparation and characterization of new metastable oxides: the case of NdCu3<\/sub>Mn3<\/sub>MO12<\/sub> (M=Fe,Cr). Sanchez-Benitez J.,Kayser P., Martinez-Lopede la Calle C., Retuerto, M., Fernandez-Diaz, MT, Alonso, JAJOURNAL OF PHYSICS: Conference Series 325, 012002 (2011).<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00a0The CaCu3Mn4O12 perovskite is a half-semiconducting and ferrimagnetic perovskite, with a TC = 360 K; it has been \u201crediscovered\u201d \u00a0upon description of a considerable MR at low field: at room temperature MR is almost saturated for magnetic fields as low as 0.03 T. Moreover, other novel compounds of this family have surprised the scientific community,…<\/p>\n","protected":false},"author":66,"featured_media":0,"parent":44,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-49","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/pages\/49","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/users\/66"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/comments?post=49"}],"version-history":[{"count":0,"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/pages\/49\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/pages\/44"}],"wp:attachment":[{"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/media?parent=49"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}