Superconductivity induced at a point contact on the topological semimetal tungsten carbide
Superconductivity induced at a point contact on the topological semimetal tungsten carbide
复制标题
拓扑半金属碳化钨点接触处诱导的超导性
DOI：
10.1103/physrevb.100.235109
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发表时间：
2019-12-05
影响因子：
3.7
通讯作者：
Shan, Lei
中科院分区：
文献类型：
--
作者：
Hou, Xing-yuan;Wang, Zong;Shan, Lei
本文报道了在正常金属针尖与WC--一种具有超硬度的三点拓扑半金属之间形成的点接触处诱导的局域超导电性。值得注意的是，最高临界温度高达近12K，但对针尖的磁性不敏感。计算了超导熔池的横向尺寸，得到了超导带隙和上临界场的温度依赖关系。这些结果限制了对诱导超导电性的解释，为探索拓扑超导电性提供了一条途径。
We report the observation of local superconductivity induced at the point contact formed between a normal metal tip and WC -- a triple point topological semimetal with super hardness. Remarkably, the maximum critical temperature is up to near 12 K but insensitive to the tip's magnetism. The lateral dimensions of the superconducting puddles were evaluated and the temperature dependencies of superconducting gap and upper critical field were also obtained. These results put constraints on the explanation of the induced superconductivity and pave a pathway for exploring topological superconductivity.