Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe4
Abstract
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 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.
- Authors:
-
[3];
[3];
[9];
[5];
[5]
- Beijing Normal University (China); Univ. of Wisconsin, Milwaukee, WI (United States)
- 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)
- Publication Date:
- Research Org.:
- West Virginia Univ., Morgantown, WV (United States)
- Sponsoring Org.:
- 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)
- OSTI Identifier:
- 1852381
- Grant/Contract Number:
- SC0017632; 2017NT06; 20190012
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 17; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; materials science; physics; superconductivity; superconductors; surfaces; Weyl semimetal
Citation Formats
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, and Liu, Ying. Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe4. United States: N. p., 2021.
Web. doi:10.1103/physrevb.103.174508.
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. Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe4. United States. https://doi.org/10.1103/physrevb.103.174508
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, and Liu, Ying. Mon .
"Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe4". United States. https://doi.org/10.1103/physrevb.103.174508. https://www.osti.gov/servlets/purl/1852381.
@article{osti_1852381,
title = {Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe4},
author = {Tang, Diandong and Chen, Yan and Yang, Meng and Wang, Qiming and Zou, Yuxiao and Wang, Xin and Li, Zezhong and Yi, Changjiang and Shi, Youguo and Kong, Xiangmu and Song, Guofeng and Xu, Yun and Wei, Xin and Weinert, Michael and Li, Lian and Fang, Weihai and Liu, Ying},
abstractNote = {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 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.},
doi = {10.1103/physrevb.103.174508},
journal = {Physical Review. B},
number = 17,
volume = 103,
place = {United States},
year = {Mon May 17 00:00:00 EDT 2021},
month = {Mon May 17 00:00:00 EDT 2021}
}
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