Nodeless Superconductivity in Kagome Metal CsV3Sb5 with and without Time Reversal Symmetry Breaking

Zhang, Wei1; Liu, Xinyou1; Wang, Lingfei1; Tsang, Chun Wai1; Wang, Zheyu1; Lam, Siu Tung1; Wang, Wenyan1; Xie, Jianyu1; Zhou, Xuefeng2; Zhao, Yusheng2; Wang, Shanmin2; Tallon, Jeff3; Lai, Kwing To1,4; Goh, Swee K.1

2023

10.1021/acs.nanolett.2c04103

NANO LETTERS   Impact Factor & Quartile

1530-6984

1530-6992

The kagome metal CsV3Sb5 features an unusual competition between the charge-density-wave (CDW) order and superconductivity. Evidence for time reversal symmetry breaking (TRSB) inside the CDW phase has been accumulating. Hence, the superconductivity in CsV3Sb5 emerges from a TRSB normal state, potentially resulting in an exotic superconducting state. To reveal the pairing symmetry, we first investigate the effect of nonmagnetic impurity. Our results show that the superconducting critical temperature is insensitive to disorder, pointing to conventional s-wave superconductivity. Moreover, our measurements of the self-field critical current (I-c,I-sf), which is related to the London penetration depth, also confirm conventional s-wave superconductivity with strong coupling. Finally, we measure I-c,I-sf where the CDW order is removed by pressure and superconductivity emerges from the pristine normal state. Our results show that s-wave gap symmetry is retained, providing strong evidence for the presence of conventional s-wave superconductivity in CsV3Sb5 irrespective of the presence of the TRSB.

kagome metal CsV3Sb5 superconducting gap critical current time reversal symmetry breaking

SCI

English

NI Journal Papers

Others

Research Grants Council of Hong Kong["CUHK 14301020","CUHK 14300722","A-CUHK402/19"] ; CUHK Direct Grant["4053461","4053408","4053528","4053463"] ; National Natural Science Foundation of China["12104384","12174175"] ; Shenzhen Basic Research Fund[JCYJ20190809173213150]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000931733900001

AMER CHEMICAL SOC

MATERIALS SCIENCE

Web of Science

1.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
3.Victoria Univ Wellington, Robinson Inst, Wellington 6140, New Zealand
4.Chinese Univ Hong Kong, Shenzhen Res Inst, Shatin, Hong Kong, Peoples R China

Zhang, Wei,Liu, Xinyou,Wang, Lingfei,et al. Nodeless Superconductivity in Kagome Metal CsV3Sb5 with and without Time Reversal Symmetry Breaking[J]. NANO LETTERS,2023.

Zhang, Wei.,Liu, Xinyou.,Wang, Lingfei.,Tsang, Chun Wai.,Wang, Zheyu.,...&Goh, Swee K..(2023).Nodeless Superconductivity in Kagome Metal CsV3Sb5 with and without Time Reversal Symmetry Breaking.NANO LETTERS.

Zhang, Wei,et al."Nodeless Superconductivity in Kagome Metal CsV3Sb5 with and without Time Reversal Symmetry Breaking".NANO LETTERS (2023).