Journal
PHYSICAL REVIEW B
Volume 94, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.024414
Keywords
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Funding
- 973 Project of the Ministry of Science and Technology of China [2014CB921500, 2015CB921303]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB07030300, XDB07020200]
- National Natural Science Foundation of China [11574378]
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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.
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