Strong enhancement of spin ordering by A -site magnetic ions in the ferrimagnet CaC u3 F e2 O s2 O12

Hongshan Deng, Min Liu, Jianhong Dai, Zhiwei Hu, Changyang Kuo, Yunyu Yin, Junye Yang, Xiao Wang, Qing Zhao, Yuanji Xu, Zhaoming Fu, Jianwang Cai, Haizhong Guo, Kuijuan Jin, Tunwen Pi, Yunliang Soo, Guanghui Zhou, Jinguang Cheng, Kai Chen, Philippe OhresserYi Feng Yang, Changqing Jin, Liu Hao Tjeng, Youwen Long

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25 Scopus citations

Abstract

ABO3 perovskite is a kind of very important functional material with versatile physical properties. Although B-site chemical substitution with various magnetic ions has been widely investigated, the A-site doping with magnetic transition metal is little known. Here we report AA3′B2B2′O12-type A- and B-site ordered ferrimagnet CaCu3Fe2Os2O12 with magnetic transition metals occupying three different atomic sites (A′, B, and B′ sites). This compound is synthesized by a special high-pressure annealing process. It possesses a much higher Curie temperature TC of 580 K compared with that of the B-site-only ordered Ca2FeOsO6 (TC=320K) without magnetic ion at the A site. First-principles numerical calculations reveal that this enhancement primarily originates from the additional spin interaction between the A′-site Cu2+ and the B′-site Os5+, generating a strong Cu2+(↑)Fe3+(↑)Os5+(↓) ferrimagnetic spin coupling. This work opens up an alternative way for enhancing the spin ordering temperature by introducing A-site magnetic ions.

Original languageEnglish
Article number024414
JournalPhysical Review B
Volume94
Issue number2
DOIs
StatePublished - 12 Jul 2016

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