期刊
PHYSICAL REVIEW B
卷 95, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.224407
关键词
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资金
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences (BES) [DEFG02-12ER46888, DEFG02-08ER46544]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1253562] Funding Source: National Science Foundation
We report on the observation of magnon thermal conductivity kappa(m) similar to 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 2K < T < 10 K. These observations establish Cu2OSeO3 as a model system for studying long-wavelength magnon dynamics.
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