Magnetic excitations in the Kitaev quantum spin liquid candidate Na2Co2TeO6 – Part I: Experiment

ORAL

Abstract

Layered honeycomb magnets have received lots of attention as potential candidates to realize Kitaev physics [1,2]. Among them, Co-based honeycomb Na2Co2TeO6 (NCTO) is recently proposed to be a potential Kitaev material. NCTO is antiferromagnetic ordered below TN = 25K. A complex temperature-field (T-B) phase diagram with multiple ordered, disordered states is proposed [3]. Here in Part I, we report the low-energy infrared and electron spin resonance spectroscopy measurements on NCTO in a broad range of temperatures and magnetic fields. The measurement results reveal a rich structure of magnetic excitations across the AFM, disordered and polarized states. Such richness of excitations is at variance with presently available theoretical models and suggests that other factors need to be taken into account. The experimental results will be further discussed with theoretical calculations in Part II.

[1] Liu et. al., Phys. Rev. B 97, 014407 (2018)

[2] Liu et. al., Phys. Rev. Lett. 125, 047201 (2020)

[3] Lin et al. Nat Commun 12, 5559 (2021).

*This work is supported by the Department of Energy, Basic Energy Sciences, under Contract No. DE- FG02-07ER46451. The National High Magnetic Field Laboratory is supported by the National Science Foundation through NSF/DMR-1644779 and the State of Florida.

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Presenters

  • Li Xiang

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

Authors

  • Li Xiang

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

  • Mykhaylo Ozerov

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

  • Yuxuan Jiang

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

  • 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

  • Ramesh Dhakal

    • Wake Forest University

  • Stephen Winter

    • Wake Forest University

  • 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