Abstract
Thermal transport mechanism in a ferroelectricity-magnetism-coexisting system, hexagonal YMnO3 is investigated. In addition to the acoustic phonon contribution, heat transport induced by optical phonon is taken into account to explain the excess thermal conductivity above TN. Magnetoelectric coupling effect on both acoustic and optical phonons is embodied by change in Debye and Einstein temperatures, respectively. Magnon-phonon resonant interaction is considered as one of the scattering mechanisms that correct relaxation time of acoustic phonon thermal conductivity. Our theoretical fitting is in good agreement with the experimental data.
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