We combine in situ electrical transport and Seebeck coefficient measurements with the ionic liquid gating technique to investigate superconductivity and the normal state of ${\mathrm{Fe}}_y{\mathrm{Se}}_{1-x}{\mathrm{Te}}_x$ (FST) films. We find that the pristine FST films feature a non-Fermi-liquid temperature dependence of the Seebeck coefficient, i.e., $S/T\sim A_{\mathrm{S}}lnT$, and $A_{\mathrm{S}}$ is strongly correlated with the superconducting transition temperature ($T_{\mathrm{c}}$). Ionic liquid gating significantly raises $T_{\mathrm{c}}$ of FST films, for which the Seebeck coefficient displays a different scaling behavior and retains the logarithmic temperature dependence. Moreover, a quantitative relationship between the slope of $T\text{−}\mathrm{linear}$ resistivity ($A_{\rho }$) and $T_{\mathrm{c}}$ for gated films is observed, i.e., ${\left(A_{\rho }\right)}^{1/2}\sim T_{\mathrm{c}}$, consistent with previous reports on cuprates and FeSe. The scaling behaviors of $A_{\mathrm{S}}$ and $A_{\rho }$ point to a spin-fluctuation-associated transport mechanism in gated ${\mathrm{Fe}}_y{\mathrm{Se}}_{1-x}{\mathrm{Te}}_x$ superconductors.

中文翻译：

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具有离子液体门控的 FeySe1−xTex 薄膜的原位电和热传输特性

我们将原位电传输和塞贝克系数测量与离子液体门控技术相结合，以研究超导性和正常状态${铁}_{是}{硒}_{\mathrm{1个}-X}{特}_X$(FST) 电影。我们发现原始 FST 薄膜具有塞贝克系数的非费米液体温度依赖性，即$\mathrm{小号}/吨～A_{\mathrm{小号}}在吨$， 和$A_{\mathrm{小号}}$与超导转变温度密切相关（${吨}_{\mathrm{C}}$). 离子液体门控显着提高${吨}_{\mathrm{C}}$FST 薄膜的塞贝克系数显示出不同的缩放行为并保留对数温度依赖性。此外，斜率之间的定量关系$吨\text{−}\mathrm{线性的}$电阻率（$A_{\rho }$） 和${吨}_{\mathrm{C}}$观察到门控薄膜，即${\left(A_{\rho }\right)}^{\mathrm{1个}/\mathrm{2个}}～{吨}_{\mathrm{C}}$，与之前关于铜酸盐和 FeSe 的报道一致。的缩放行为$A_{\mathrm{小号}}$和$A_{\rho }$指向门控中与自旋涨落相关的传输机制${铁}_{是}{硒}_{\mathrm{1个}-X}{特}_X$超导体。