Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe4
Diandong Tang, Yan Chen, Meng Yang, Qiming Wang, Yuxiao Zou, Xin Wang, Zezhong Li, Changjiang Yi, Youguo Shi, Xiangmu Kong, Guofeng Song, Yun Xu, Xin Wei, Michael Weinert, Lian Li, Weihai Fang, Ying Liu
DOI 10.1103/PhysRevB.103.174508 · Physical Review B
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Abstract
TaIrTe4 is a recently discovered type-II Weyl semimetal, hosting only four Weyl points. Here, we study the cleaved TaIrTe4 crystal using scanning tunneling microscopy/spectroscopy and find that it also hosts a superconducting state with a transition temperature of 3.9 K. From Dynes function fitting, the superconducting phase is consistent with anisotropic s-wave pairing, with a superconducting gap of 1.31 meV. This value leads to a value of 2Δmax/kBTC=7.81, much larger than the 3.53 predicted by Bardeen-Cooper-Schrieffer theory for weak-coupling superconductors. The critical field is found to be 0.7 T based on the analysis of tunneling conductance as a function of magnetic field. Two types of nonmagnetic defects on the TaIrTe4 surface are observed, neither of which induce bound states inside the superconducting gap, further supporting conventional s-wave superconductivity in the TaIrTe4 system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TaIrTe4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.9 | Pressure not reported | onset |
| TaIrTe4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | onset |
| MoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.1 | Pressure not reported | unknown |
| WTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | unknown |
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