LaFePO中节超导性的扫描SQUID磁化率测量证据
Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry
摘要：
我们测量了$T_c \approx 6$ K超导体LaFePO的穿透深度$λ$的变化。在这个过程中，扫描SQUID衍射仪被证明是一种精确测量$λ$中{ \it局部}温度依赖性变化的技术，使其成为研究早期或难以生长材料的理想方法。LaFePO的$λ$在0.36 ~ $\sim$ 2 K范围内随温度呈线性变化，斜率为143 $\pm$ 15 Ω/K，表明在超导序参量中存在线节点.直到$\sim T_c/3$的线性相关性与铜氧化物超导体相似，表明节点发育良好。
英文摘要：
We measure changes in the penetration depth $λ$ of the $T_c \approx 6$ K superconductor LaFePO. In the process scanning SQUID susceptometry is demonstrated as a technique for accurately measuring {\it local} temperature-dependent changes in $λ$, making it ideal for studying early or difficult-to-grow materials. $λ$ of LaFePO is found to vary linearly with temperature from 0.36 to $\sim$2 K, with a slope of 143$\pm$15 Å/K, suggesting line nodes in the superconducting order parameter. The linear dependence up to $\sim T_c/3$ is similar to the cuprate superconductors, indicating well-developed nodes.
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