Magnetic excitations in the Kitaev quantum spin liquid candidate Na<sub>2</sub>Co<sub>2</sub>TeO<sub>6</sub> – Part II: Theory

ORAL

Abstract

The honeycomb cobaltates are pseudospin-1/2 materials known for their highly anisotropic and bond-dependent magnetic couplings, which have been recently highlighted as potential Kitaev materials. In this contribution, we discuss the stacked honeycomb material Na2Co2TeO6, for which a variety of magnetic models have been proposed on the basis of neutron scattering[1,2] and electron spin resonance measurements[3]. Combining ab-initio calculations with modeling of the neutron scattering and infrared / ESR (part I) experiments, we present a complete picture of the magnetic Hamiltonian and excitations. The effect of disorder of inter-layer Na ions on Co-Co magnetic coupling will also be discussed.

[1] W. Yao, et al., Phys. Rev. Lett. 129, 147202 (2022)

[2] W. Chen, et al., Phys. Rev. B 103, L180404 (2021)

[3] G. Lin, et al., Nat. Commun.12, 1-8 (2021)

*This work was supported by a pilot grant from the Center for Functional Materials, WFU.

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Presenters

  • Ramesh Dhakal

    • Wake Forest University

Authors

  • Ramesh Dhakal

    • Wake Forest University

  • Li Xiang

    • Florida State University
    • National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
    • National High Magnetic Field Laboratory

  • Yuxuan Jiang

    • School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, China
    • Anhui University

  • Mykhaylo Ozerov

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

  • Andrzej Ozarowski

    • National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
    • National High Magnetic Field Laboratory

  • Jiyuan Fang

    • School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
    • Georgia Institute of Technology

  • Zhigang Jiang

    • School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
    • Georgia Institute of Technology

  • Dmitry Smirnov

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

  • Stephen Winter

    • Wake Forest University