Observation of large magnon-polaron Hall effect in MnPS₃

Recent studies have demonstrated that the thermal Hall effect can originate from magnons (magnon Hall effect), phonons (phonon Hall effect), or their combination (magnon-polaron Hall effect). The magnon-polaron Hall effect, first observed in 2017 in Fe₂Mo₃O₈ ¹, held the record for the strongest thermal Hall signal in an insulating magnet at the time. In this study, we explore the thermal Hall effect in MnPS₃, an insulating antiferromagnetic material exhibiting a spin-flop transition and strong magnetoelastic coupling, making it a strong candidate for studying the magnon-polaron Hall effect. We report a record-high thermal Hall angle down to 4 K, and show that it cannot be accounted for by standard calculations based on the intrinsic magnon-polaron Berry curvature. Our findings provide an in-depth analysis of the role of the spin-flop transition in the thermal properties of MnPS3 and call for further investigations of magnon-phonon interactions and their influence on the quasiparticle Berry curvature and scattering.





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