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Large thermal Hall effect in MnPS3.

Mohamed Nawwar1, Robin R Neumann2,3, Jiamin Wen1

  • 1Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, United States of America.

Reports on Progress in Physics. Physical Society (Great Britain)
|August 7, 2025
PubMed
Summary
This summary is machine-generated.

This study investigates the thermal Hall effect (THE) in MnPS3, revealing an unexpectedly large thermal Hall angle. The findings highlight the significance of the spin-flop transition and suggest limitations in current theories of magnon-phonon coupling.

Keywords:
MnPS3magnon polaronsthermal Hall effect

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Area of Science:

  • Condensed Matter Physics
  • Solid-State Physics
  • Materials Science

Background:

  • The thermal Hall effect (THE) can arise from magnons, phonons, or magnon-polaron interactions.
  • The magnon-polaron Hall effect, observed in Fe2Mo3O8, exhibits a notably large thermal Hall signal.
  • MnPS3, an insulating antiferromagnet, shows a spin-flop transition and strong magnetoelastic coupling, making it ideal for studying spin-lattice coupling effects on THE.

Purpose of the Study:

  • To investigate the thermal Hall effect in MnPS3, focusing on the influence of its spin-flop transition.
  • To analyze the origin of the large thermal Hall signal in MnPS3 and its relation to spin-lattice coupling.
  • To assess the adequacy of current theoretical models in explaining the observed THE in MnPS3.

Main Methods:

  • Experimental measurement of the thermal Hall effect in MnPS3 down to 4 K.
  • Analysis of the material's magnetic and thermal properties, particularly around the spin-flop transition.
  • Comparison of experimental results with theoretical calculations based on magnon-polaron Berry curvature.

Main Results:

  • An exceptionally large thermal Hall angle was observed in MnPS3, persisting down to 4 K.
  • Standard theoretical calculations failed to reproduce the experimental THE, indicating the need for refined models.
  • The spin-flop transition was identified as a crucial factor influencing the thermal properties of MnPS3.

Conclusions:

  • The study demonstrates a significant role for spin-lattice coupling in the thermal Hall effect of MnPS3.
  • Current theories do not fully capture the complex magnon-phonon interactions responsible for the observed THE.
  • Further theoretical development is required to understand magnon-phonon coupling and scattering in transverse heat transport.