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Magnetic interactions in the quantum spin liquid candidate Na<sub>2</sub>BaCo(PO<sub>4</sub>)<sub>2</sub>

ORAL

Abstract

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

Presenters

  • Jared Gdanski

    The Ohio State University

Authors

  • Jared Gdanski

    The Ohio State University

  • Guangyong Xu

    National Institute of Standards and Technology

  • Ruidan Zhong

    Princeton University

  • Robert J Cava

    Princeton University, Department of Chemistry, Princeton University

  • Franz Demmel

    ISIS Facility, Rutherford Appleton Laboratory

  • Suheon Lee

    Sungkyunkawn University

  • Yuan-Ming Lu

    The Ohio State University

  • Zhijun Xu

    National Institute of Standards and Technology