Mustonen, O.H.J. orcid.org/0000-0002-3896-9875, Fogh, E. orcid.org/0000-0001-8305-4466, Paddison, J.A.M. et al. (10 more authors) (2024) Structure, spin correlations, and magnetism of the S = 1/2 square-lattice antiferromagnet Sr2CuTe1–xWxO6 (0 ≤ x ≤ 1). Chemistry of Materials, 36 (1). pp. 501-513. ISSN 0897-4756
Abstract
Quantum spin liquids are highly entangled magnetic states with exotic properties. The S = 1/2 square-lattice Heisenberg model is one of the foundational models in frustrated magnetism with a predicted, but never observed, quantum spin liquid state. Isostructural double perovskites Sr2CuTeO6 and Sr2CuWO6 are physical realizations of this model but have distinctly different types of magnetic order and interactions due to a d10/d0 effect. Long-range magnetic order is suppressed in the solid solution Sr2CuTe1–xWxO6 in a wide region of x = 0.05–0.6, where the ground state has been proposed to be a disorder-induced spin liquid. Here, we present a comprehensive neutron scattering study of this system. We show using polarized neutron scattering that the spin liquid-like x = 0.2 and x = 0.5 samples have distinctly different local spin correlations, which suggests that they have different ground states. Low-temperature neutron diffraction measurements of the magnetically ordered W-rich samples reveal magnetic phase separation, which suggests that the previously ignored interlayer coupling between the square planes plays a role in the suppression of magnetic order at x ≈ 0.6. These results highlight the complex magnetism of Sr2CuTe1–xWxO6 and hint at a new quantum critical point between 0.2 < x < 0.4.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Authors. Published by American Chemical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Chemical structure; Magnetic properties; Order; Quantum mechanics; Scattering |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 15 Jan 2024 12:03 |
Last Modified: | 15 Jan 2024 12:03 |
Published Version: | http://dx.doi.org/10.1021/acs.chemmater.3c02535 |
Status: | Published |
Publisher: | American Chemical Society (ACS) |
Refereed: | Yes |
Identification Number: | 10.1021/acs.chemmater.3c02535 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:207569 |