Geometrical frustration versus Kitaev interactions in BaCo 2 (AsO 4 ) 2-Reference-Cited by-同舟云学术

Geometrical frustration versus Kitaev interactions in BaCo ₂ (AsO ₄ ) ₂

Published:2023-01-06 Issue:2 Volume:120 Page:
ISSN:0027-8424
Container-title:Proceedings of the National Academy of Sciences
language:en
Short-container-title:Proc. Natl. Acad. Sci. U.S.A.

Author:

Halloran Thomas¹^ORCID,Desrochers Félix²^ORCID,Zhang Emily Z.²^ORCID,Chen Tong¹^ORCID,Chern Li Ern³^ORCID,Xu Zhijun⁴⁵^ORCID,Winn Barry⁶^ORCID,Graves-Brook M.⁶,Stone M. B.⁶^ORCID,Kolesnikov Alexander I.⁶,Qiu Yiming⁴^ORCID,Zhong Ruidan⁷⁸^ORCID,Cava Robert⁷,Kim Yong Baek²,Broholm Collin¹⁹^ORCID

Affiliation:

1. Institute for Quantum Matter, Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218

2. Department of Physics, University of Toronto, Toronto ON M5S 1A7, Canada

3. Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom

4. National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, MD 20899

5. Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742

6. Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831

7. Department of Chemistry, Princeton University, Princeton, NJ 08544

8. Tsung-Dao Lee Institute, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

9. Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218

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 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.

Funder

U.S. Department of Energy

Gordon and Betty Moore Foundation

Gouvernement du Canada | Natural Sciences and Engineering Research Council of Canada

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

Link

https://pnas.org/doi/pdf/10.1073/pnas.2215509119

Reference73 articles.

1. Anyons in an exactly solved model and beyond