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  Liu, Z.; Sun, Q.; Ye, X.; Wang, X.; Zhou, L.; Shen, X.; Chen, K.; Nataf, L.; Baudelet, F.; Agrestini, S.; Chen, C.T.; Lin, H.J.; Vasili, H.B.; Valvidares, M.; Hu, Z.; Yang, Y.F.; Long, Y.: Quadruple perovskite oxide LaCu₃Co₂Re₂O₁₂: A ferrimagnetic half metal with nearly 100% B-site degree of order. Applied Physics Letters 117 (2020), p. 152402/1-5

10.1063/5.0025704

Abstract:
An A- and B-site ordered quadruple perovskite oxide LaCu3Co2Re2O12 was synthesized at 9 GPa and 1323 K. The compound possesses a Pn-3 space group, where both A and B sites are orderly occupied by different cations with a nearly 100% degree of order. Bond valence sum calculations and x-ray absorption spectroscopy confirm the charge distribution to be LaCu2+3Co2+2Re5.5+2O12. A ferrimagnetic phase transition is found to occur around 150 K due to the Cu2+(↑)-Co2+(↑)-Re5.5+(↓) spin coupling found by x-ray magnetic circular dichroism at Cu-, Co-, and Re-L2,3 edges. The magnetoresistance effects as well as the first-principle calculations indicate the half-metallic nature for LaCu3Co2Re2O12 with a wider energy gap at the up-spin channel and a conducting band at the down-spin channel.