High-Pressure Synthesis of Quadruple Perovskite Oxide CaCu<sub>3</sub>Cr<sub>2</sub>Re<sub>2</sub>O<sub>12</sub> with a High Ferrimagnetic Curie Temperature
Jie Zhang, Zhehong Liu, Xubin Ye, Xiao Wang, Dabiao Lu, Haoting Zhao, Maocai Pi, Chien‐Te Chen, Jeng‐Lung Chen, Chang‐Yang Kuo, Zhiwei Hu, Xiaohui Yu, Xueqiang Zhang, Zhao Pan, Youwen Long
Abstract
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.