Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu 2 OSeO 3
Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu 2 OSeO 3
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弹道磁振子热传导和螺旋磁绝缘体 Cu 2 OSeO 3 中可能的泊肃叶流
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
J. Cohn
中科院分区：
文献类型：
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作者：
N. Prasai;B. Trump;G. Marcus;A. Akopyan;Sunxiang Huang;T. McQueen;J. Cohn
我们报告的观察磁振子热导率$kappa_msim $70 W/mK近5 K的helmagnetetic绝缘体Cu $2$OSeO $3 $，超过了在任何其他铁磁体测量的几乎两个数量级。在1 K以下建立了磁振子和声子的弹道、边界限制输运，提出了磁振子的Poilluille流来解释在2 K <T<$10 K范围内磁振子平均自由程大大超过最小缺陷样品的样品宽度。这些观测结果建立了Cu 2 OSeO 3作为研究长波磁振子动力学的模型系统。
We report on the observation of magnon thermal conductivity $kappa_msim$ 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.