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 journalArticlepeer-review

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 [Formula: see text] model and the XXZ[Formula: see text]model. We show that the existing experimental data can be consistently accounted for by the XXZ[Formula: see text]model but not by the [Formula: see text] 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 languageEnglish (US)
Pages (from-to)e2215509119
JournalProceedings of the National Academy of Sciences of the United States of America
Volume120
Issue number2
DOIs
StatePublished - Jan 10 2023

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • frustrated magnetism
  • inelastic neutron scattering
  • Kitaev model
  • molecular dynamics

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