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

Journal Article · · Physical Review B
 [1];  [2];  [2];  [1];  [1];  [2];  [1]
  1. Univ. of Miami, Coral Gables, FL (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States)

Herein 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 2 K < T < 10 K. These observations establish Cu 2 OSeO 3 as a model system for studying long-wavelength magnon dynamics.

Research Organization:
Univ. of Miami, Coral Gables, FL (United States); Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0008607; FG02-08ER46544
OSTI ID:
1657463
Alternate ID(s):
OSTI ID: 1361444
Journal Information:
Physical Review B, Vol. 95, Issue 22; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Magnonic topological insulators in antiferromagnets text January 2017

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