Charge and spin order in the perovskite CaF e0.5 M n0.5 O3: Charge disproportionation behavior of randomly arranged F e4+

Yoshiteru Hosaka, Noriya Ichikawa, Takashi Saito, Yuichi Shimakawa, John Attfield

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number104429
JournalPhysical review B: Condensed matter and materials physics
Volume94
Issue number10
Early online date26 Sep 2016
DOIs
Publication statusE-pub ahead of print - 26 Sep 2016

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