Geometrical frustration versus Kitaev interactions in BaCo 2 (AsO 4 ) 2
Abstract
Recently, Co-based honeycomb magnets have been proposed as promising candidate materials to host the Kitaev spin liquid (KSL) state. One of the front-runners is BaCo 2 (AsO 4 ) 2 (BCAO), where it was suggested that the exchange processes between Co 2+ ions via the surrounding edge-sharing oxygen octahedra could give rise to bond-dependent Kitaev interactions. In this work, we present and analyze a comprehensive inelastic neutron scattering (INS) study of BCAO with fields in the honeycomb plane. Combining the constraints from the magnon excitations in the high-field polarized state and the inelastic spin structure factor measured in zero magnetic field, we examine two leading theoretical models: the Kitaev-type model and the XXZ model. We show that the existing experimental data can be consistently accounted for by the XXZ model but not by the model, and we discuss the implications of these results for the realization of a spin liquid phase in BCAO and more generally for the realization of the Kitaev model in cobaltates.
- Authors:
-
- Institute for Quantum Matter, Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218
- Department of Physics, University of Toronto, Toronto ON M5S 1A7, Canada
- Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
- National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, MD 20899, Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
- National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, MD 20899
- Department of Chemistry, Princeton University, Princeton, NJ 08544, Tsung-Dao Lee Institute, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
- Department of Chemistry, Princeton University, Princeton, NJ 08544
- Institute for Quantum Matter, Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation (GBMF); Natural Sciences and Engineering Research Council of Canada (NSERC)
- OSTI Identifier:
- 1907999
- Alternate Identifier(s):
- OSTI ID: 1928929
- Grant/Contract Number:
- SC0019331; AC05-00OR22725; GBMF9456; DMR-1508249
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 120 Journal Issue: 2; Journal ID: ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; frustrated magnetism; Kitaev model; inelastic neutron scattering; molecular dynamics
Citation Formats
Halloran, Thomas, Desrochers, Félix, Zhang, Emily Z., Chen, Tong, Chern, Li Ern, Xu, Zhijun, Winn, Barry, Graves-Brook, M., Stone, M. B., Kolesnikov, Alexander I., Qiu, Yiming, Zhong, Ruidan, Cava, Robert, Kim, Yong Baek, and Broholm, Collin. Geometrical frustration versus Kitaev interactions in BaCo 2 (AsO 4 ) 2. United States: N. p., 2023.
Web. doi:10.1073/pnas.2215509119.
Halloran, Thomas, Desrochers, Félix, Zhang, Emily Z., Chen, Tong, Chern, Li Ern, Xu, Zhijun, Winn, Barry, Graves-Brook, M., Stone, M. B., Kolesnikov, Alexander I., Qiu, Yiming, Zhong, Ruidan, Cava, Robert, Kim, Yong Baek, & Broholm, Collin. Geometrical frustration versus Kitaev interactions in BaCo 2 (AsO 4 ) 2. United States. https://doi.org/10.1073/pnas.2215509119
Halloran, Thomas, Desrochers, Félix, Zhang, Emily Z., Chen, Tong, Chern, Li Ern, Xu, Zhijun, Winn, Barry, Graves-Brook, M., Stone, M. B., Kolesnikov, Alexander I., Qiu, Yiming, Zhong, Ruidan, Cava, Robert, Kim, Yong Baek, and Broholm, Collin. Fri .
"Geometrical frustration versus Kitaev interactions in BaCo 2 (AsO 4 ) 2". United States. https://doi.org/10.1073/pnas.2215509119.
@article{osti_1907999,
title = {Geometrical frustration versus Kitaev interactions in BaCo 2 (AsO 4 ) 2},
author = {Halloran, Thomas and Desrochers, Félix and Zhang, Emily Z. and Chen, Tong and Chern, Li Ern and Xu, Zhijun and Winn, Barry and Graves-Brook, M. and Stone, M. B. and Kolesnikov, Alexander I. and Qiu, Yiming and Zhong, Ruidan and Cava, Robert and Kim, Yong Baek and Broholm, Collin},
abstractNote = {Recently, Co-based honeycomb magnets have been proposed as promising candidate materials to host the Kitaev spin liquid (KSL) state. One of the front-runners is BaCo 2 (AsO 4 ) 2 (BCAO), where it was suggested that the exchange processes between Co 2+ ions via the surrounding edge-sharing oxygen octahedra could give rise to bond-dependent Kitaev interactions. In this work, we present and analyze a comprehensive inelastic neutron scattering (INS) study of BCAO with fields in the honeycomb plane. Combining the constraints from the magnon excitations in the high-field polarized state and the inelastic spin structure factor measured in zero magnetic field, we examine two leading theoretical models: the Kitaev-type JK Γ Γ ′ model and the XXZ - J 1 - J 3 model. We show that the existing experimental data can be consistently accounted for by the XXZ - J 1 - J 3 model but not by the JK Γ Γ ′ model, and we discuss the implications of these results for the realization of a spin liquid phase in BCAO and more generally for the realization of the Kitaev model in cobaltates.},
doi = {10.1073/pnas.2215509119},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 2,
volume = 120,
place = {United States},
year = {Fri Jan 06 00:00:00 EST 2023},
month = {Fri Jan 06 00:00:00 EST 2023}
}
https://doi.org/10.1073/pnas.2215509119
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