Abstract
We report on the observation of magnon thermal conductivity κm ∼ 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.
| Original language | English (US) |
|---|---|
| Article number | 224407 |
| Journal | Physical Review B |
| Volume | 95 |
| Issue number | 22 |
| DOIs | |
| State | Published - Jun 1 2017 |
ASJC Scopus subject areas
- Condensed Matter Physics
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Prasai, N., Trump, B. A., Marcus, G. G., Akopyan, A., Huang, S., McQueen, T. M., & Cohn, J. (2017). Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu2OSeO3. Physical Review B, 95(22), [224407]. https://doi.org/10.1103/PhysRevB.95.224407