Geometrical frustration versus Kitaev interactions in BaCo2(AsO4)2

被引：26

作者：

Halloran, Thomas ^{[1
]}

Desrochers, Felix ^{[2
]}

Zhang, Emily Z. ^{[2
]}

Chen, Tong ^{[1
]}

Chern, Li Ern ^{[3
]}

Xu, Zhijun ^{[4
,5
]}

Winn, Barry ^{[6
]}

Graves-Brook, M. ^{[6
]}

Stone, M. B. ^{[6
]}

Kolesnikov, Alexander I. ^{[6
]}

Qiu, Yiming ^{[4
]}

Zhong, Ruidan ^{[7
,8
]}

Cava, Robert ^{[7
]}

Kim, Yong Baek ^{[2
]}

Broholm, Collin ^{[1
,9
]}

机构：

[1] Johns Hopkins Univ, Inst Quantum Matter, Dept Phys & Astron, Baltimore, MD 21218 USA

[2] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[3] Univ Cambridge, Cavendish Lab, Theory Condensed Matter Grp, Cambridge CB3 0HE, England

[4] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[5] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[6] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA

[7] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[8] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Sch Phys & Astron, Shanghai 200240, Peoples R China

[9] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2023年 / 120卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

frustrated magnetism; Kitaev model; inelastic neutron scattering; molecular dynamics; NEUTRON-SCATTERING; QUANTUM; MODEL; PHYSICS; ANYONS;

D O I：

10.1073/pnas.2215509119

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 JKFF' 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 JKF F' 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.

引用

页数：12

共 50 条

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