A unique van Hove singularity in kagome superconductor CsV3-xTaxSb5 with enhanced superconductivity

Yang Luo, Yulei Han, Jinjin Liu, Hui Chen, Zihao Huang, Linwei Huai, Hongyu Li, Bingqian Wang, Jianchang Shen, Shuhan Ding, Zeyu Li, Shuting Peng, Zhiyuan Wei, Yu Miao, Xiupeng Sun, Zhipeng Ou, Ziji Xiang, Makoto Hashimoto, Donghui Lu, Yugui Yao, Haitao Yang, Xianhui Chen, Hong-Jun Gao (), Zhenhua Qiao (), Zhiwei Wang () and Junfeng He ()
Additional contact information
Yang Luo: University of Science and Technology of China
Yulei Han: Fuzhou University
Jinjin Liu: Beijing Institute of Technology
Hui Chen: Chinese Academy of Sciences
Zihao Huang: Chinese Academy of Sciences
Linwei Huai: University of Science and Technology of China
Hongyu Li: University of Science and Technology of China
Bingqian Wang: University of Science and Technology of China
Jianchang Shen: University of Science and Technology of China
Shuhan Ding: University of Science and Technology of China
Zeyu Li: University of Science and Technology of China
Shuting Peng: University of Science and Technology of China
Zhiyuan Wei: University of Science and Technology of China
Yu Miao: University of Science and Technology of China
Xiupeng Sun: University of Science and Technology of China
Zhipeng Ou: University of Science and Technology of China
Ziji Xiang: University of Science and Technology of China
Makoto Hashimoto: SLAC National Accelerator Laboratory
Donghui Lu: SLAC National Accelerator Laboratory
Yugui Yao: Beijing Institute of Technology
Haitao Yang: Chinese Academy of Sciences
Xianhui Chen: University of Science and Technology of China
Hong-Jun Gao: Chinese Academy of Sciences
Zhenhua Qiao: University of Science and Technology of China
Zhiwei Wang: Beijing Institute of Technology
Junfeng He: University of Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Van Hove singularity (VHS) has been considered as a driving source for unconventional superconductivity. A VHS in two-dimensional (2D) materials consists of a saddle point connecting electron-like and hole-like bands. In a rare case, when a VHS appears at Fermi level, both electron-like and hole-like conduction can coexist, giving rise to an enhanced density of states as well as an attractive component of Coulomb interaction for unconventional electronic pairing. However, this van Hove scenario is often destroyed by an incorrect chemical potential or competing instabilities. Here, by using angle-resolved photoemission measurements, we report the observation of a VHS perfectly aligned with the Fermi level in a kagome superconductor CsV3-xTaxSb5 (x ~ 0.4), in which a record-high superconducting transition temperature is achieved among all the current variants of AV3Sb5 (A = Cs, Rb, K) at ambient pressure. Doping dependent measurements reveal the important role of van Hove scenario in boosting superconductivity, and spectroscopic-imaging scanning tunneling microscopy measurements indicate a distinct superconducting state in this system.

Date: 2023
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DOI: 10.1038/s41467-023-39500-7

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