Author(s): Tang, DD (Tang, Diandong); Chen, Y (Chen, Yan); Yang, M (Yang, Meng); Wang, QM (Wang, Qiming); Zou, YX (Zou, Yuxiao); Wang, X (Wang, Xin); Li, ZZ (Li, Zezhong); Yi, CJ (Yi, Changjiang); Shi, YG (Shi, Youguo); Kong, XM (Kong, Xiangmu); Song, GF (Song, Guofeng); Xu, Y (Xu, Yun); Wei, X (Wei, Xin); Weinert, M (Weinert, Michael); Li, L (Li, Lian); Fang, WH (Fang, Weihai); Liu, Y (Liu, Ying)

Source: PHYSICAL REVIEW B Volume: 103 Issue: 17 Article Number: 174508 DOI: 10.1103/PhysRevB.103.174508 Published: MAY 17 2021

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 2 Delta(max)/k(B)T(C) = 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.

Accession Number: WOS:000655867300004

ISSN: 2469-9950

eISSN: 2469-9969

Full Text: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.174508