Magnetic interactions in the quantum spin liquid candidate Na2BaCo(PO4)2

Motivated by the recent discovery of the quantum spin liquid (QSL) candidate material Na₂BaCo(PO₄)₂ (PNAS 116 (29) 14505-14510), we use inelastic neutron scattering to determine the magnetic interaction in this material. We find that an out-of-plane magnetic field of larger than 3 T is enough to destroy the QSL phase and polarize the spins in the system, where a well-defined spin wave dispersion emerges. By fitting the observed spin wave spectrum with a linear spin wave theory, we are able to obtain the magnetic interactions in the system. We find that the nearest neighbor exchange interaction is dominated by an easy-axis Ising interaction and a bond-dependent Kitaev-type exchange interaction. Our study paves the way to understand the nature of the plausible QSL phase in Na₂BaCo(PO₄)₂.

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Bulletin of the American Physical Society

APS March Meeting 2022

Volume 67, Number 3

Monday–Friday, March 14–18, 2022; Chicago

Session B51: Kitaev Materials I

Abstract: B51.00003 : Magnetic interactions in the quantum spin liquid candidate Na2BaCo(PO4)2

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Abstract: B51.00003 : Magnetic interactions in the quantum spin liquid candidate Na₂BaCo(PO₄)₂