Ballistic magnon transport and phonon scattering in the antiferromagnet Nd2CuO4 -: art. no. 156603
Ballistic magnon transport and phonon scattering in the antiferromagnet Nd2CuO4 -: art. no. 156603
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DOI：
10.1103/physrevlett.95.156603
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发表时间：
2005-10-07
影响因子：
8.6
通讯作者：
Chen, XH
中科院分区：
文献类型：
--
作者：
Li, SY;Taillefer, L;Chen, XH
反铁磁体Nd 2CuO 4的热导率测量到50 mK。利用自旋翻转跃迁来开关声学Nd磁振子，我们可以可靠地分离磁振子和声子对热输运的贡献。我们发现，磁振子弹道旅行低于0.5 K，与T-3的热导率增长，从中我们提取它们的速度。结果表明，声子对声磁振子的散射率随T-3的增加而增加，并且声子对磁振子的散射在平均Nd磁振子频率的两倍处达到峰值。
The thermal conductivity of the antiferromagnet Nd2CuO4 was measured down to 50 mK. Using the spin-flop transition to switch on and off the acoustic Nd magnons, we can reliably separate the magnon and phonon contributions to heat transport. We find that magnons travel ballistically below 0.5 K, with a thermal conductivity growing as T-3, from which we extract their velocity. We show that the rate of scattering of acoustic magnons by phonons grows as T-3, and the scattering of phonons by magnons peaks at twice the average Nd magnon frequency.