Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe4

Tang, Diandong; Chen, Yan; Yang, Meng; Wang, Qiming; Zou, Yuxiao; Wang, Xin; Li, Zezhong; Yi, Changjiang; Shi, Youguo; Kong, Xiangmu; Song, Guofeng; Xu, Yun; Wei, Xin; Weinert, Michael; Li, Lian; Fang, Weihai; Liu, Ying

doi:10.1103/physrevb.103.174508

Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe₄

Journal Article · Mon May 17 00:00:00 EDT 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.103.174508· OSTI ID:1852381

Tang, Diandong ^[1]; Chen, Yan ^[2]; ^[3]; Wang, Qiming ^[4]; ^[3]; Wang, Xin ^[5]; Li, Zezhong ^[5]; Yi, Changjiang ^[6]; Shi, Youguo ^[7]; Kong, Xiangmu ^[8]; Song, Guofeng ^[3]; Xu, Yun ^[2]; Wei, Xin ^[3]; ^[9]; Li, Lian ^[10]; ^[5]; ^[5]

Beijing Normal University (China); Univ. of Wisconsin, Milwaukee, WI (United States); OSTI
Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China); Beijing Key Laboratory of Inorganic Stretchable and Flexible Information Technology (China)
Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
Qufu Normal University (China)
Beijing Normal University (China)
Chinese Academy of Sciences (CAS), Beijing (China)
University of Chinese Academy of Sciences, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
Qufu Normal University (China); Ludong University, Yantai (China)
Univ. of Wisconsin, Milwaukee, WI (United States)
West Virginia Univ., Morgantown, WV (United States)

TaIrTe₄ is a recently discovered type-II Weyl semimetal, hosting only four Weyl points. In this work, 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 2Δ_max/k_BT_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.

View Accepted Manuscript (DOE)

Research Organization:: West Virginia Univ., Morgantown, WV (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: SC0017632

OSTI ID:: 1852381

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 103; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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