Verification of the Wiedemann-Franz Law in YbRh2Si2 at a Quantum Critical Point
Verification of the Wiedemann-Franz Law in YbRh2Si2 at a Quantum Critical Point
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DOI：
10.1103/physrevlett.110.236402
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发表时间：
2013-06-07
影响因子：
8.6
通讯作者：
Flouquet, J.
中科院分区：
文献类型：
--
作者：
Machida, Y.;Tomokuni, K.;Flouquet, J.
测量了重费米子化合物YbRh_2Si_2在0.04K温度下的热导率，并在磁场下通过平行于c轴的量子临界点（QCP）.在T -> 0的极限下，我们发现尽管费米液体的标准特征被破坏，但在QCP的实验误差范围内，仍满足Wiedemann-Franz定律。我们的研究结果放置强有力的约束模型，试图描述的非常规量子临界的性质的YbRh 2Si 2。
The thermal conductivity measurements are performed on the heavy-fermion compound YbRh2Si2 down to 0.04 K and under magnetic fields through a quantum critical point (QCP) at B-c = 0.66 T parallel to c axis. In the limit as T -> 0, we find that the Wiedemann-Franz law is satisfied within experimental error at the QCP despite the destruction of the standard signature of Fermi liquid. Our results place strong constraints on models that attempt to describe the nature of the unconventional quantum criticality of YbRh2Si2.