论文标题
FESE $ _ {1-x} $ s $ _x $的晶格偏移的nematic量子关键点
Lattice-Shifted Nematic Quantum Critical Point in FeSe$_{1-x}$S$_x$
论文作者
论文摘要
我们报告了FESE $ _ {1-x} $ s $ _x $单晶的列表波动的演变，这是硫含量$ x $的函数，nematic量子关键点（qcp）$ x_c \ sim $ 0.17通过拉曼散射。 $ b_ {1g} $ nematic通道中的拉曼光谱由两个组成部分组成，但只有低能量的一个部分显示出关键行为的清晰指纹，并归因于流动载体。对相关列敏感性的居里 - 韦斯分析表明，Nemato弹性耦合的实质性影响，这改变了列QCP的位置。我们认为，这种晶格诱导的转移可能解释了QCP上超导过渡温度的任何增强。列在列的波动光谱中存在两个组成部分归因于洪德金属中电子自由度的双重方面，巡游者和局部瞬间都导致了nematigation敏感性。
We report the evolution of nematic fluctuations in FeSe$_{1-x}$S$_x$ single crystals as a function of Sulfur content $x$ across the nematic quantum critical point (QCP) $x_c\sim$ 0.17 via Raman scattering. The Raman spectra in the $B_{1g}$ nematic channel consist of two components, but only the low energy one displays clear fingerprints of critical behavior and is attributed to itinerant carriers. Curie-Weiss analysis of the associated nematic susceptibility indicates a substantial effect of nemato-elastic coupling which shifts the location of the nematic QCP. We argue that this lattice-induced shift likely explains the absence of any enhancement of the superconducting transition temperature at the QCP. The presence of two components in the nematic fluctuations spectrum is attributed to the dual aspect of electronic degrees of freedom in Hund's metals, with both itinerant carriers and local moments contributing to the nematic susceptibility.
