Thermal Hall effect in a van der Waals triangular magnet FeCL2

Xu, Chunqiang; Carnahan, Caitlin; Zhang, Heda; Sretenovic, Milos; Zhang, Pengpeng; Xiao, Di; Ke, Xianglin

doi:10.1103/physrevb.107.l060404

Thermal Hall effect in a van der Waals triangular magnet FeCL₂

Journal Article · Sun Feb 05 23:00:00 EST 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.l060404· OSTI ID:2421064

Xu, Chunqiang ^[1]; Carnahan, Caitlin ^[2]; Zhang, Heda ^[3]; ^[3]; Zhang, Pengpeng ^[3]; Xiao, Di ^[4]; ^[3]

Michigan State Univ., East Lansing, MI (United States); Ningbo University (China); OSTI
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Michigan State Univ., East Lansing, MI (United States)
Univ. of Washington, Seattle, WA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: SC0019259

OSTI ID:: 2421064

Alternate ID(s):: OSTI ID: 2573040

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Thermal Hall effect in a van der Waals triangular magnet FeCL2

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Thermal Hall effect in a van der Waals triangular magnet FeCL₂