Frustration relieved ferrimagnetism in novel A- and B-site-ordered quadruple perovskite

Abstract

A novel A- and B-site-ordered quadruple perovskite CaCu₃Fe₂Sb₂O₁₂ was obtained and it shows ferrimagnetism below about 170 K. The B-site Fe spin sublattice adapts a tetrahedral framework in a cubic structure and the Fe³⁺–Fe³⁺ antiferromagnetic interaction can result in a geometrical spin frustration as seen in a simple perovskite Ca₂FeSbO₆. With the introduction of Cu²⁺ into the A′ site, the antiferromagnetic spin frustration is relieved by the strong Cu²⁺–Fe³⁺ interaction, and a ferrimagnetic ordering appears at a much higher temperature than the spin–glass transition temperature.