1. Geometrical frustration versus Kitaev interactions in BaCo2(AsO4)2.
- Author
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Halloran, Thomas, Desrochers, Félix, Zhang, Emily Z., Tong Chen, Li Ern Chern, Zhijun Xu, Winn, Barry, Graves-Brook, M., Stone, M. B., Kolesnikov, Alexander I., Yiming Qiu, Ruidan Zhong, Cava, Robert, Yong Baek Kim, and Broholm, Collin
- Subjects
INELASTIC neutron scattering ,EXCHANGE ,FRUSTRATION ,MAGNETIC fields ,BOND prices ,HONEYCOMB structures - 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 (AsO4 )2 (BCAO), where it was suggested that the exchange processes between Co2+ 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 000 model and the XXZ-J1 -J3 model. We show that the existing experimental data can be consistently accounted for by the XXZ-J1 -J3 model but not by the JK 000 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. [ABSTRACT FROM AUTHOR]- Published
- 2023
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