（Ca $_{x}$ Sr $_{1-x}$）$_3$ Rh $_4$ Sn $_{13}$中的临界电流密度峰值，向结构量子临界点调整
Peak in the critical current density in (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$ tuned towards the structural quantum critical point
摘要：
(Ca $_{1-x}$）$_3$ Rh $_4$ Sn $_{13}$是一种罕见的系统，已被证明显示出结构量子临界性和超导性之间有趣的相互作用。在（Ca $_{x}$ Sr $_{1-x}$）$_3$ Rh $_4$ Sn $_{13}$中，一个隐藏在宽的超导圆顶下的量子结构临界点被认为是产生最佳超导性能的原因.然而，超导圆顶本身的存在阻碍了通过电输运对量子临界点的检查，因为输运系数在超导状态下消失。在这里，我们使用临界电流密度来探索超导圆顶内。我们的测量揭示了一个大的增强的临界电流密度在零温度极限时，系统被调整到结构量子临界点。
英文摘要：
(Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$ is a rare system that has been shown to display an interesting interplay between structural quantum criticality and superconductivity. A putative structural quantum critical point, which is hidden beneath a broad superconducting dome, is believed to give rise to optimized superconducting properties in (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$. However, the presence of the superconducting dome itself hinders the examination of the quantum critical point through electrical transport, as the transport coefficients vanish in the superconducting state. Here, we use critical current density to explore within the superconducting dome. Our measurements reveal a large enhancement of the critical current density at the zero-temperature limit when the system is tuned towards the structural quantum critical point.
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