Abstract
Here we synthesize and characterize a new double-perovskite oxide Sr2CuIrO6. The synthesis requires the use of high oxygen pressure to stabilize the VI oxidation state of iridium. The compound has a tetragonally-distorted crystal structure due to the Jahn–Teller active CuII ion, and a high degree of B-site cation order. Magnetic transition is apparent at 15K, but the zero-field-cooled and field-cooled susceptibilities diverge below this temperature. The high degree of cation order would exclude the possibility of a typical spin-glass, indicating that the divergence is probably due to a frustration of the magnetic interactions between Cu and Ir, with a high frustration factor of f≈25.
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