Non-Fermi liquid transport in the vicinity of the nematic quantum critical point of superconducting FeSe1-xSx
Non-Fermi liquid transport in the vicinity of the nematic quantum critical point of superconducting FeSe1-xSx
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DOI：
10.1103/physrevresearch.2.033367
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发表时间：
2020-09-08
影响因子：
4.2
通讯作者：
Matsuda, Y.
中科院分区：
文献类型：
--
作者：
Huang, W. K.;Hosoi, S.;Matsuda, Y.
非费米液体是一种奇怪的金属，它的物理性质由于强量子涨落而与传统金属的物理性质发生了质的偏离。本文报道了FeSe1-xSx超导体的输运测量，该超导体具有向列数量级的量子临界点，但不伴有反铁磁性。我们发现，除了与T成正比的线性温度电阻率rho（xx）接近普朗克极限外，霍尔角随cot θ (H)与T-2成正比而变化，在向列量子临界点附近，低场磁电阻很好地缩放为δ rho(xx)/rho（xx）与tan(2) θ (H)成比例。这组异常电荷输运性质与铜、铁和重费米子超导体中报道的异常电荷输运性质惊人地相似，表明q近似于0的向列序的临界波动也会导致费米液体描述的崩溃。
Non-Fermi liquids are strange metals whose physical properties deviate qualitatively from those of conventional metals due to strong quantum fluctuations. In this paper, we report transport measurements on the FeSe1-xSx superconductor, which has a quantum critical point of a nematic order without accompanying antiferromagnetism. We find that in addition to a linear-in-temperature resistivity rho(xx) proportional to T, which is close to the Planckian limit, the Hall angle varies as cot theta(H) proportional to T-2 and the low-field magnetoresistance is well scaled as Delta rho(xx)/rho(xx) proportional to tan(2) theta(H) in the vicinity of the nematic quantum critical point. This set of anomalous charge transport properties show striking resemblance with those reported in cuprate, iron-pnictide, and heavy fermion superconductors, demonstrating that the critical fluctuations of a nematic order with q approximate to 0 can also lead to a breakdown of the Fermi liquid description.