Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu                         2                         OSeO                         3

N. Prasai; B. A. Trump; G. G. Marcus; A. Akopyan; S. X. Huang; T. M. McQueen; J. L. Cohn

doi:10.1103/PhysRevB.95.224407

Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu ₂ OSeO ₃

N. Prasai, B. A. Trump, G. G. Marcus, A. Akopyan, S. X. Huang, T. M. McQueen, J. L. Cohn

Physics

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We report on the observation of magnon thermal conductivity κ _m ∼ 70 W/mK near 5 K in the helimagnetic insulator Cu ₂ OSeO ₃ , 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 Cu ₂ OSeO ₃ 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	https://doi.org/10.1103/PhysRevB.95.224407
State	Published - Jun 2017

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.95.224407

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Prasai, N., Trump, B. A., Marcus, G. G., Akopyan, A., Huang, S. X., McQueen, T. M., & Cohn, J. L. (2017). Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu ₂ OSeO ₃ Physical Review B, 95(22), [224407]. https://doi.org/10.1103/PhysRevB.95.224407

Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu ₂ OSeO ₃ . / Prasai, N.; Trump, B. A.; Marcus, G. G.; Akopyan, A.; Huang, S. X.; McQueen, T. M.; Cohn, J. L.

In: Physical Review B, Vol. 95, No. 22, 224407, 06.2017.

Research output: Contribution to journal › Article › peer-review

Prasai, N, Trump, BA, Marcus, GG, Akopyan, A, Huang, SX, McQueen, TM & Cohn, JL 2017, ' Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu ₂ OSeO ₃ ', Physical Review B, vol. 95, no. 22, 224407. https://doi.org/10.1103/PhysRevB.95.224407

Prasai N, Trump BA, Marcus GG, Akopyan A, Huang SX, McQueen TM et al. Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu ₂ OSeO ₃ Physical Review B. 2017 Jun;95(22). 224407. https://doi.org/10.1103/PhysRevB.95.224407

Prasai, N. ; Trump, B. A. ; Marcus, G. G. ; Akopyan, A. ; Huang, S. X. ; McQueen, T. M. ; Cohn, J. L. / Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu ₂ OSeO ₃ In: Physical Review B. 2017 ; Vol. 95, No. 22.

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abstract = " We report on the observation of magnon thermal conductivity κ m ∼ 70 W/mK near 5 K in the helimagnetic insulator Cu 2 OSeO 3 , 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 Cu 2 OSeO 3 as a model system for studying long-wavelength magnon dynamics. ",

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Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu ₂ OSeO ₃

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