Geometrical frustration versus Kitaev interactions in BaCo2(AsO4)2.
Proc Natl Acad Sci U S A
; 120(2): e2215509119, 2023 Jan 10.
Article
em En
| MEDLINE
| ID: mdl-36608295
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.
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Base de dados:
MEDLINE
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article