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  • Letter

Thermal Hall effect in a van der Waals triangular magnet FeCl2

Chunqiang Xu1,2, Caitlin Carnahan3, Heda Zhang1, Milos Sretenovic1, Pengpeng Zhang1, Di Xiao4, and Xianglin Ke1

  • 1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA
  • 2School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
  • 3Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
  • 4Department of Materials Science and Engineering and Department of Physics, University of Washington, Seattle, Washington 98195, USA

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Phys. Rev. B 107, L060404 – Published 6 February, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L060404

Abstract

Thermal transport is a pivotal probe for studying low-energy, charge-neutral quasiparticles in insulating magnets. In this Letter, we report an observation of large magnetothermal conductivity and thermal Hall effect (THE) in a van der Waals antiferromagnet FeCl2. The magnetothermal conductivity reaches over ∼700%, indicating strong magnon-phonon coupling. Furthermore, we find an appreciable thermal Hall signal which changes sign concurrently with the spin-flip transition from the antiferromagnetic state to the polarized ferromagnetic state. Our theoretical calculations suggest that, in addition to the Berry curvature induced at the anticrossing points of the hybridized magnon and acoustic phonon modes of FeCl2, other mechanisms are needed to account for the magnitude of the observed THE.

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Phys. Rev. B 107, L060404– Published 6 February, 2023
  • Received 10 June 2022
  • Revised 24 January 2023
  • Accepted 26 January 2023
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