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Coexistence of localized and itinerant electrons in the double-perovskite Ba2Fe2/3Mo4/3O6

AuthorsLópez, Carlos A.; Saleta, Martín E.; Pedregosa, José C.; Sánchez, Rodolfo D.; Alonso, J. A. ; Fernández-Díaz, M. T.
Mixed‐­valent compounds
Magnetic properties
Perovskite phases
Issue Date1-Aug-2014
PublisherJohn Wiley & Sons
CitationEuropean Journal of Inorganic Chemistry 2014(22): 3555-3563 (2014)
AbstractA polycrystalline Ba2Fe2/3Mo4/3O 6 double-perovskite has been prepared by decomposition of citrate precursors and subsequent thermal treatment under a reducing atmosphere. The crystal structure has been studied by combined X-ray and neutron powder diffraction (XRPD and NPD). At room temperature, the structure is cubic (Fm3̄m) with lattice parameter a = 8.0710(1) Å. It is unchanged between 3 and 320 K. The crystallographic formula is Ba2[Fe 0.52(2)Mo0.48(2)]4a[Fe0.14(2)Mo 0.86(2)]4bO5.9(2). NPD, electron spin resonance (ESR), and magnetization measurements show spontaneous magnetization below the Curie temperature (TC) = 310 K. The ESR behavior is associated with the presence of localized Fe3+ ions, whereas the transport properties (electrical conductivity and Seebeck effect) suggest the presence of highly correlated electrons in a metallic band with disorder, which can be associated with the Mo t2g electrons. The coexistence of localized and itinerant electrons leads to non-negligible magnetoresistance properties.
Publisher version (URL)https://doi.org/10.1002/ejic.201402241
Appears in Collections:(ICMM) Artículos
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