Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu2OSeO3
Abstract
We report on the observation of magnon thermal conductivity m 70 W/mK near 5 K in the helimagnetic insulator Cu2OSeO3, exceeding that measured in any other ferromagnet by almost two orders of magnitude. Ballistic, boundary-limited transport for both magnons and phonons is established below 1 K, and Poiseuille flow of magnons is proposed to explain a magnon mean-free path substantially exceeding the specimen width for the least defective specimens in the range 2 K <T< 10 K. These observations establish Cu2OSeO3 as a model system for studying long-wavelength magnon dynamics.
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