期刊
CHEMISTRY OF MATERIALS
卷 25, 期 10, 页码 2100-2108出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm400655x
关键词
LaCu0.5Mn0.5O3; orthorhombic perovskite; magneto resistance; superexchange interactions; ferromagnetism; antiferromagnetism
资金
- Spanish Ministerio de Ciencia e Innovacion [CSD2009-00013, MAT2007-61954, MAT2011-23068, MAT2011-27470-C02-02]
- PICATA postdoctoral fellowship of the Moncloa Campus of International Excellence (UCM)
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.
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