Two superconducting phases induced at point contacts on the Weyl semimetal TaAs
Xing-Yuan Hou, Ya-Dong Gu, Shu-Jing Li, Ling-Xiao Zhao, Wen-Liang Zhu, Zong Wang, Meng-Di Zhang, Fan Zhang, Lu Zhang, Hai Zi, Yan-Wei Wu, Huai-Xin Yang, Zhi-An Ren, Ping Zhang, Gen-Fu Chen, Ning Hao, Lei Shan
DOI 10.1103/PhysRevB.101.134503 · Physical Review B
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Abstract
Tip-induced superconductivity at point contacts on the nonsuperconducting Weyl semimetal TaAs has been reported recently. Meanwhile, both the main tetragonal phase and the intergrown hexagonal phase of TaAs were identified to be topologically nontrivial according to theoretical calculations. Here, we report the observation of two independent local superconducting states induced at the point contacts formed on TaAs, which exhibit distinct temperature dependencies of the critical magnetic field Hc2(T). A universal relationship between Hc2(0), Tc, and the Fermi velocities of bulk bands near Weyl points of the two TaAs phases was uncovered, demonstrating the dominant role of the bulk bands in the emergence of superconductivity, rather than the surface states. These results provide a direction to study the mechanism of the tip-induced superconductivity in topological semimetals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TaAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.15 | Pressure not reported | onset |
| TaAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | onset |
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