1. Charge and spin order in the perovskite CaFe0.5Mn0.5O3: Charge disproportionation behavior of randomly arranged Fe4+.
- Author
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Yoshiteru Hosaka, Noriya Ichikawa, Takashi Saito, Attfield, J. Paul, and Yuichi Shimakawa
- Subjects
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DISPROPORTIONATION (Chemistry) , *PEROVSKITE , *VALENCE (Chemistry) , *HIGH pressure chemistry , *ANTIFERROMAGNETIC materials , *MAGNETIC structure - Abstract
B-site-disordered perovskite CaFe0.5Mn0.5O3 with unusually high valence Fe4+ was synthesized using a high-pressure technique. Fe4+ randomly distributed at half of the B sites shows charge disproportionation to Fe3+ and Fe5+. The spins of Fe3+,Fe5+, and Mn4+ order below 90 K. Analysis of low-temperature neutron powder-diffraction data revealed a G-type antiferromagnetic structure--where all the nearest-neighboring spins of Fe3+,Fe5+, and Mn4+ couple antiparallel--and the small ordered moment of 0.58μB reveals local charge ordering that gives rise to predominant Fe3+-O-Fe5+ antiferromagnetic arrangements. Despite the identical chemical compositions of CaFe0.5Mn0.5O3 and Ca2FeMnO6, the magnetic structure of the present CaFe0.5Mn0.5O3 is very different from the noncollinear one of layered B-site-ordered Ca2FeMnO6. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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