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

研究成果: Article同行評審

30 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號024414
期刊Physical Review B
94
發行號2
DOIs
出版狀態Published - 12 七月 2016

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