Geometrical frustration versus Kitaev interactions in BaCo2(AsO4)2

Thomas Halloran; Félix Desrochers; Emily Z. Zhang; Tong Chen; Li Ern Chern; Zhijun Xu; Barry Winn; M. Graves-Brook; M. B. Stone; Alexander I. Kolesnikov; Yiming Qiu; Ruidan Zhong; Robert Cava; Yong Baek Kim; Collin Broholm

doi:10.1073/pnas.2215509119

Geometrical frustration versus Kitaev interactions in BaCo₂(AsO₄)₂

Thomas Halloran, Félix Desrochers, Emily Z. Zhang, Tong Chen, Li Ern Chern, Zhijun Xu, Barry Winn, M. Graves-Brook, M. B. Stone, Alexander I. Kolesnikov, Yiming Qiu, Ruidan Zhong, Robert Cava, Yong Baek Kim, Collin Broholm

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

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 BaCo₂(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-J₃model. We show that the existing experimental data can be consistently accounted for by the XXZ-J₁-J₃model 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.

Original language	English (US)
Article number	e2215509119
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	120
Issue number	2
DOIs	https://doi.org/10.1073/pnas.2215509119
State	Published - Jan 10 2023

All Science Journal Classification (ASJC) codes

General

Keywords

Kitaev model
frustrated magnetism
inelastic neutron scattering
molecular dynamics

Access to Document

10.1073/pnas.2215509119

Cite this

Halloran, T., Desrochers, F., Zhang, E. Z., Chen, T., Chern, L. E., Xu, Z., Winn, B., Graves-Brook, M., Stone, M. B., Kolesnikov, A. I., Qiu, Y., Zhong, R., Cava, R., Kim, Y. B., & Broholm, C. (2023). Geometrical frustration versus Kitaev interactions in BaCo₂(AsO₄)₂. Proceedings of the National Academy of Sciences of the United States of America, 120(2), Article e2215509119. https://doi.org/10.1073/pnas.2215509119

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title = "Geometrical frustration versus Kitaev interactions in BaCo2(AsO4)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 BaCo2(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-J3model. We show that the existing experimental data can be consistently accounted for by the XXZ-J1-J3model 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.",

keywords = "Kitaev model, frustrated magnetism, inelastic neutron scattering, molecular dynamics",

author = "Thomas Halloran and F{\'e}lix Desrochers and Zhang, {Emily Z.} and Tong Chen and Chern, {Li Ern} and Zhijun Xu and Barry Winn and M. Graves-Brook and Stone, {M. B.} and Kolesnikov, {Alexander I.} and Yiming Qiu and Ruidan Zhong and Robert Cava and Kim, {Yong Baek} and Collin Broholm",

note = "Publisher Copyright: Copyright {\textcopyright} 2023 the Author(s).",

year = "2023",

month = jan,

day = "10",

doi = "10.1073/pnas.2215509119",

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Halloran, T, Desrochers, F, Zhang, EZ, Chen, T, Chern, LE, Xu, Z, Winn, B, Graves-Brook, M, Stone, MB, Kolesnikov, AI, Qiu, Y, Zhong, R, Cava, R, Kim, YB & Broholm, C 2023, 'Geometrical frustration versus Kitaev interactions in BaCo₂(AsO₄)₂', Proceedings of the National Academy of Sciences of the United States of America, vol. 120, no. 2, e2215509119. https://doi.org/10.1073/pnas.2215509119

TY - JOUR

T1 - Geometrical frustration versus Kitaev interactions in BaCo2(AsO4)2

AU - Halloran, Thomas

AU - Desrochers, Félix

AU - Zhang, Emily Z.

AU - Chen, Tong

AU - Chern, Li Ern

AU - Xu, Zhijun

AU - Winn, Barry

AU - Graves-Brook, M.

AU - Stone, M. B.

AU - Kolesnikov, Alexander I.

AU - Qiu, Yiming

AU - Zhong, Ruidan

AU - Cava, Robert

AU - Kim, Yong Baek

AU - Broholm, Collin

PY - 2023/1/10

Y1 - 2023/1/10

N2 - 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 BaCo2(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-J3model. We show that the existing experimental data can be consistently accounted for by the XXZ-J1-J3model 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.

AB - 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 BaCo2(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-J3model. We show that the existing experimental data can be consistently accounted for by the XXZ-J1-J3model 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.

KW - Kitaev model

KW - frustrated magnetism

KW - inelastic neutron scattering

KW - molecular dynamics

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