Thermal Hall effect in a van der Waals triangular magnet FeCl2

Abstract

Thermal transport is a pivotal probe for studying low-energy, charge-neutral quasi-particles in insulating magnets. In this Letter, we report an observation of large magneto-thermal conductivity and thermal Hall effect (THE) in a van der Waals antiferromagnet FeCl2. The magneto-thermal 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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• Thermal Hall effect in a van der Waals ferromagnet CrI3
• Phonon thermal Hall effect in Mott insulators via skew-scattering by the scalar spin chirality
• Phonon thermal Hall effect in non-magnetic Y${}_2$Ti${}_2$O${}_7$
• Exchange striction induced thermal Hall effect in van der Waals antiferromagnet MnPS${}_3$
• Topological magnon-polarons in honeycomb antiferromagnets with spin-flop transition
• Large Thermal Hall Effect in MnPS${}_3$
• Topological magnon-polaron transport in a bilayer van der Waals magnet
• Intrinsic thermal Hall effect of optical phonons enhanced by discrete rotational symmetry
• Band topology and dynamic multiferroicity induced from dynamical Dzyaloshinskii-Moriya interactions in centrosymmetric lattices