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  • Letter
  • Open Access

Planar thermal Hall effects in the Kitaev spin liquid candidate Na2Co2TeO6

Hikaru Takeda1, Jiancong Mai1, Masatoshi Akazawa1, Kyo Tamura1, Jian Yan1, Kalimuthu Moovendaran2, Kalaivanan Raju2, Raman Sankar2, Kwang-Yong Choi3 et al.

Minoru Yamashita1,*

  • 1The Institute for Solid State Physics, University of Tokyo, Kashiwa, 277–8581, Japan
  • 2Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
  • 3Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea

  • *my@issp.u-tokyo.ac.jp
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Phys. Rev. Research 4, L042035 – Published 23 November, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L042035

Abstract

We investigate both the longitudinal thermal conductivity (κxx) and the planar thermal Hall conductivity (κxy) in the Kitaev spin liquid candidate of the cobalt-based honeycomb antiferromagnet Na2Co2TeO6 in a magnetic field (B) applied along the a- and a*-axes. A finite κxy is resolved for both field directions in the antiferromagnetic (AFM) phase below the Néel temperature of 27 K. The temperature dependence of κxy/T shows the emergence of topological bosonic excitations. In addition, the field dependence of κxy shows sign reversals at the critical fields in the AFM phase, suggesting the changes in the Chern number distribution of the topological magnons. Remarkably, a finite κxy is observed in B∥a* between the first-order transition field in the AFM phase and the saturation field, which is prohibited in a disordered state by the two-fold rotation symmetry around the a* axis of the honeycomb lattice, showing the presence of a magnetically ordered state that breaks the two-fold rotation symmetry. Our results demonstrate the presence of topological magnons in this compound in the whole field range below the saturation field.

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Phys. Rev. Research 4, L042035– Published 23 November, 2022
  • Received 17 March 2022
  • Revised 19 October 2022
  • Accepted 24 October 2022
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