title: 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 Fe(3+)-Fe(3+) antiferromagnetic interaction can result in a geometrical spin frustration as seen in a simple perovskite Ca2FeSbO6. With the introduction of Cu(2+) into the A' site, the antiferromagnetic spin frustration is relieved by the strong Cu(2+)-Fe(3+) interaction, and a ferrimagnetic ordering appears at a much higher temperature than the spin-glass transition temperature.
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.forename: Wei-tin
authors.initials: WT
authors.lastname: Chen
authors.forename: Masaichiro
authors.initials: M
authors.lastname: Mizumaki
authors.forename: Takashi
authors.initials: T
authors.lastname: Saito
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Shimakawa