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A new 3d-5d hybridized quadruple perovskite oxide, CaCu3Mn2Ir2O12, wassynthesized by high-pressure and high-temperature methods. The Rietveldstructure analysis reveals that the compound crystallizes in an AA'3B4O12-typeperovskite structure with space group Im-3, where the Ca and Cu are 1:3 orderedat fixed atomic positions. At the B site the 3d Mn and the 5d Ir ions aredisorderly distributed due to a rare equal +4 charge states for both of them asdetermined by X-ray absorption spectroscopy. The competing antiferromagneticand ferromagnetic interactions among Cu2+, Mn4+, and Ir4+ ions give rise tospin glass behavior, which follows a conventional dynamical slowing down model.

High-pressure synthesis and spin glass behavior of a Mn/Ir disordered quadruple perovskite CaCu3Mn2Ir2O12