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Strong enhancement of spin ordering by A-site magnetic ions in the ferrimagnet CaCu3Fe2Os2O12

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Hu,  Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kuo,  Changyang
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  Liu-Hao
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Deng, H., Liu, M., Dai, J., Hu, Z., Kuo, C., Yin, Y., et al. (2016). Strong enhancement of spin ordering by A-site magnetic ions in the ferrimagnet CaCu3Fe2Os2O12. Physical Review B, 94(2): 024414, pp. 1-8. doi:10.1103/PhysRevB.94.024414.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-246A-F
Abstract
ABO(3) 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 AA'3B2B'(2) O-12-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 T-C of 580 K compared with that of the B-site-only ordered Ca2FeOsO6 (T-C = 320 K) 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+(up arrow)Fe3+(up arrow)Os5+(down arrow) ferrimagnetic spin coupling. This work opens up an alternative way for enhancing the spin ordering temperature by introducing A-site magnetic ions.