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Nodeless electron pairing in CsV$ 3$Sb$ 5$-derived kagome superconductors by Zhong, Yigui; Liu, Jinjin; Wu, Xianxin; Guguchia, Zurab; Yin, J. -X.; Mine, Akifumi; Li, Yongkai; Najafzadeh, Sahand; Das, Debarchan; Mielke, Charles; Khasanov, Rustem; Luetkens, Hubertus; Suzuki, Takeshi; Liu, Kecheng; Han, Xinloong; Kondo, Takeshi; Hu, Jiangping; Shin, Shik; Wang, Zhiwei; Shi, Xun; Yao, Yugui; Okazaki, Kozo is a scholarly article available to read on EtoBox.

What is Nodeless electron pairing in CsV$ 3$Sb$ 5$-derived kagome superconductors about?

The newly discovered kagome superconductors represent a promising platform for investigating the interplay between band topology, electronic order, and lattice geometry. Despite extensive research efforts on this system, the nature of the superconducting ground state remains elusive. In particular, consensus on the electron pairing symmetry has not been achieved so far, in part owing to the lack of a momentum-resolved measurement of the superconducting gap structure. Here we report the direct observation of a nodeless, nearly isotropic, and orbital-independent superconducting gap in the momentum space of two exemplary CsV$_3$Sb$_5$-derived kagome superconductors -- Cs(V$_{0.93}$Nb$_{0.07}$)$_3$Sb$_5$ and Cs(V$_{0.86}$Ta$_{0.14}$)$_3$Sb$_5$, using ultrahigh resolution and low-temperature angle-resolved photoemission spectroscopy (ARPES). Remarkably, such a gap structure is robust to the appearance or absence of charge order in the normal state, tuned by isovalent Nb/Ta substitutions of V. Moreover, we observe a signature of the time-reversal symmetry (TRS) breaking inside the superconducting state, which extends the previous observation of TRS-breaking CDW in the kagome lattice. Our

Author

Zhong, Yigui; Liu, Jinjin; Wu, Xianxin; Guguchia, Zurab; Yin, J. -X.; Mine, Akifumi; Li, Yongkai; Najafzadeh, Sahand; Das, Debarchan; Mielke, Charles; Khasanov, Rustem; Luetkens, Hubertus; Suzuki, Takeshi; Liu, Kecheng; Han, Xinloong; Kondo, Takeshi; Hu, Jiangping; Shin, Shik; Wang, Zhiwei; Shi, Xun; Yao, Yugui; Okazaki, Kozo

Published

2023

Language

EN