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Magnetoresistance and ferromagnetism in disordered LaCu0.5Mn0.5O3 perovskite

AuthorsCortés-Gil, R.; Ruíz-González, M. L.; Alonso, José M. ; García-Hernández, M. ; Hernando, Antonio ; González-Calbet, José M.
Superexchange interactions
Orthorhombic perovskite
Issue Date2013
PublisherAmerican Chemical Society
CitationChemistry of Materials 25(10): 2100-2108 (2013)
AbstractMagnetoresistance (MR) in half doped copper LaCu0.5Mn 0.5O3 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. LaCu0.5Mn 0.5O3 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. © 2013 American Chemical Society.
Identifiersdoi: 10.1021/cm400655x
issn: 0897-4756
e-issn: 1520-5002
Appears in Collections:(ICMM) Artículos
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