Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu2OSeO3

N. Prasai, B. A. Trump, G. G. Marcus, A. Akopyan, Sunxiang Huang, T. M. McQueen, Joshua Cohn

Research output: Contribution to journalArticle

12 Scopus citations

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 languageEnglish (US)
Article number224407
JournalPhysical Review B
Volume95
Issue number22
DOIs
StatePublished - Jun 1 2017

ASJC Scopus subject areas

  • Condensed Matter Physics

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