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

Otto Mustonen; Sami Vasala; Heather Mutch; Chris I Thomas; Gavin B G Stenning; Elisa Baggio-Saitovitch; Edmund J Cussen; Maarit Karppinen

doi:10.1039/c8cc09479a

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

Chem Commun (Camb). 2019 Jan 25;55(8):1132-1135. doi: 10.1039/c8cc09479a. Epub 2019 Jan 10.

Authors

Otto Mustonen¹, Sami Vasala², Heather Mutch³, Chris I Thomas⁴, Gavin B G Stenning⁵, Elisa Baggio-Saitovitch⁶, Edmund J Cussen³, Maarit Karppinen⁴

Affiliations

¹ Department of Chemistry and Materials Science, Aalto University, FI-00076 Espoo, Finland. maarit.karppinen@aalto.fi ohj.mustonen@gmail.com and Department of Materials Science and Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK.
² Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro 22290-180, Brazil and Technische Universität Darmstadt, Institut für Materialwissenschaft, Fachgebiet Materialdesign durch Synthese, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany.
³ Department of Materials Science and Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK.
⁴ Department of Chemistry and Materials Science, Aalto University, FI-00076 Espoo, Finland. maarit.karppinen@aalto.fi ohj.mustonen@gmail.com.
⁵ ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, OX11 0QX, UK.
⁶ Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro 22290-180, Brazil.

PMID: 30628600
DOI: 10.1039/c8cc09479a

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(Te_1-xW_x)O₆ solid solution similar to recent observations in Sr₂Cu(Te_1-xW_x)O₆.