Neutron Scattering Study of the Kitaev Spin-Liquid Candidate Material BaCo<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>
ORAL · Invited
Abstract
Recently, a new generation of Kitaev materials has been proposed that is based on the low spin configuration 3d7 Co2+. We present an inelastic single-crystal neutron scattering study of one such spin-liquid candidate material BaCo2(AsO4)2 (BCAO). This material has attracted interest due to the observation of the suppression of magnetic order into a paragagnet-like phase above an in-plane critical field of Hab≈0.55 T. This melting of order with field is reminiscent of α-RuCl3, where the high field state is proposed to be a quantum spin-liquid. Structural considerations and the small critical field make BCAO an appealing Kitaev spin-liquid candidate. The observed magnetic excitations in a fully field-polarized phase are modeled using linear spin-wave theory, and accompanying bulk characterization studies are used to determine the exchange interactions and place the material within the generalized phase diagram of the K-Γ-Γ'-J model.
*This work was supported as part of the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0019331 and by the Gordon Betty Moore Foundation under Award No. GBMF9456.
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Publication: Unpublished
Presenters
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Thomas J Halloran
- Johns Hopkins University