High pressure synthesis and high performance half metallicity of quadruple perovskite oxide DyCu3Fe2Re2O12

Abstract

The A and B site ordered quadruple perovskite oxide DyCu3 Fe 2 Re 2 O 12 with cubic Pn 3 symmetry was synthesized under high pressure and high temperature conditions. The material experiences a sharp long range ferrimagnetic transition arising from the strong superexchange antiferromagnetic interactions of Cu Re and Fe Re at a high Curie temperature TC amp; 8776; 660 K . Owing to the influence at lower temperatures of the antiferromagnetic ordering of the Dy3 occupying the A site, the susceptibility of DyCu3 Fe 2 Re 2 O 12 decreases continuously below 50 K, which is essentially different from that of the isostructural compound LaCu3 Fe 2 Re 2 O 12 . Moreover, in the presence of a magnetic field, the A site Dy3 spins are readily transformed into the ferromagnetic state from theantiferromagnetic ground state. Thus,the saturated magnetic moment of DyCu3 Fe 2 Re 2 O 12 is sharply enhanced from 7.0 amp; 956;B f.u. at 300 K to 14 amp; 956;B f.u. at 2 K by applying a magnetic field of 7 T. Theoretical calculations suggest that DyCu3 Fe 2 Re 2 O 12 is a half metallic ferrimagnet with a spin up band gap of approximately 2.0 eV. The combination of the high Curie temperature, wide half metallic energy gap, and large magnetic moment makes DyCu3 Fe 2 Re 2 O 12 promising for potential applications in advanced spintronic device