High-Pressure Synthesis of Quadruple Perovskite Oxide CaCu 3 Cr 2 Re 2 O 12 with a High Ferrimagnetic Curie Temperature.
Jie ZhangZhehong LiuXubin YeXiao WangDabiao LuHaoting ZhaoMaocai PiChien-Te ChenJeng-Lung ChenChang-Yang KuoZhiwei HuXiaohui YuXueqiang ZhangZhao PanYouwen LongPublished in: Inorganic chemistry (2024)
An AA' 3 B 2 B' 2 O 12 -type quadruple perovskite oxide of CaCu 3 Cr 2 Re 2 O 12 was synthesized at 18 GPa and 1373 K. Both an A- and B-site ordered quadruple perovskite crystal structure was observed, with the space group Pn -3. The valence states are verified to be CaCu 3 2+ Cr 2 3+ Re 2 5+ O 12 by bond valence sum calculations and synchrotron X-ray absorption spectroscopy. The spin interaction among Cu 2+ , Cr 3+ , and Re 5+ generates a ferrimagnetic transition with the Curie temperature ( T C ) at about 360 K. Moreover, electric transport properties and specific heat data suggest the presence of a half-metallic feature for this compound. The present study provides a promising quadruple perovskite oxide with above-room-temperature ferrimagnetism and possible half-metallic properties, which shows potential in the usage of spintronic devices.
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