Magnetic interactions in the = 1/2 square-lattice antiferromagnets BaCuTeO and BaCuWO: parent phases of a possible spin liquid

The isostructural double perovskites Ba 2 CuTeO 6 and Ba 2 CuWO 6 are shown by theory and experiment to be frustrated square-lattice antiferromagnets with opposing dominant magnetic interactions. This is driven by differences in orbital hybridisation of Te 6+ and W 6+ . A spin-liquid-like ground sta...

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Published in:Chemical communications (Cambridge, England) England), 2019-01, Vol.55 (8), p.1132-1135
Main Authors: Mustonen, Otto, Vasala, Sami, Mutch, Heather, Thomas, Chris I, Stenning, Gavin B. G, Baggio-Saitovitch, Elisa, Cussen, Edmund J, Karppinen, Maarit
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Summary:The isostructural double perovskites Ba 2 CuTeO 6 and Ba 2 CuWO 6 are shown by theory and experiment to be frustrated square-lattice antiferromagnets with opposing dominant magnetic interactions. This is driven by differences in orbital hybridisation of Te 6+ and W 6+ . A spin-liquid-like ground state is predicted for Ba 2 Cu(Te 1− x W x )O 6 solid solution similar to recent observations in Sr 2 Cu(Te 1− x W x )O 6 . Magnetic interactions in double perovskites Ba 2 CuTeO 6 and Ba 2 CuWO 6 are characterized leading to a prediction of a spin-liquid-like state in Ba 2 Cu(Te 1− x W x )O 6 .
ISSN:1359-7345
1364-548X
DOI:10.1039/c8cc09479a