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Magnetic interactions in the S = 1/2 square-lattice antiferromagnets Ba₂CuTeO₆ and Ba₂CuWO₆: parent phases of a possible spin liquid

Author:
Mustonen, Otto, Vasala, Sami, Mutch, Heather, Thomas, Chris I., Stenning, Gavin B. G., Baggio-Saitovitch, Elisa, Cussen, Edmund J., Karppinen, Maarit
Source:
Chemical communications 2019 v.55 no.8 pp. 1132-1135
ISSN:
1364-548X
Subject:
barium, chemical reactions, copper, liquids, magnetism, strontium, tellurium, tungsten
Abstract:
The isostructural double perovskites Ba₂CuTeO₆ and Ba₂CuWO₆ 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 Te⁶⁺ and W⁶⁺. A spin-liquid-like ground state is predicted for Ba₂Cu(Te₁₋ₓWₓ)O₆ solid solution similar to recent observations in Sr₂Cu(Te₁₋ₓWₓ)O₆.
Agid:
6269284