Exchange striction induced thermal Hall effect in van der Waals antiferromagnet MnPS${}_3$

Abstract

The thermal Hall effect has emerged as an ideal probe for investigating topological phenomena of charge-neutral excitation. Notably, it reveals crucial aspects of spin-lattice couplings that have been difficult to access for decades. However, the exchange striction mechanism from a lattice-induced change in exchange interaction has often been ignored in thermal Hall experiments. MnPS3 can offer a platform to study exchange striction on the thermal Hall effect due to its significant spin-lattice coupling and field-induced non-collinear spin configuration. Our thermal transport data show distinct temperature and field dependence of longitudinal thermal conductivity (${\kappa }_{xx}$) and thermal Hall effect (${\kappa }_{xy}$). By using detailed theoretical calculation, we found that the inclusion of the exchange striction is essential for a better description of both ${\kappa }_{xx}$ and ${\kappa }_{xy}$. Our result demonstrates the importance of the exchange striction mechanism for a complete understanding of the magnon-phonon-driven thermal Hall effect.

24 pages, 6 figures, accepted for publication in Phys. Rev. B

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Cited by in corpus (4)

• High Chern numbers and topological flat bands in high-field polarized Kitaev magnets on the star lattice
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• Anomalies in the thermal conductivity of honeycomb antiferromagnet MnPS${}_3$
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