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

Luo, Yang; Han, Yulei; Liu, Jinjin; Chen, Hui; Huang, Zihao; Huai, Linwei; Li, Hongyu; Wang, Bingqian; Shen, Jianchang; Ding, Shuhan; Li, Zeyu; Peng, Shuting; Wei, Zhiyuan; Miao, Yu; Sun, Xiupeng; Ou, Zhipeng; Xiang, Ziji; Hashimoto, Makoto; Lu, Donghui; Yao, Yugui; Yang, Haitao; Chen, Xianhui; Gao, Hong-Jun; Qiao, Zhenhua; Wang, Zhiwei; He, Junfeng

doi:10.1038/s41467-023-39500-7

Title: A unique van Hove singularity in kagome superconductor CsV_3-xTa_xSb₅ with enhanced superconductivity

Journal Article · 27 June 2023 · Nature Communications

DOI: https://doi.org/10.1038/s41467-023-39500-7 · OSTI ID:2000077

Luo, Yang ^[1];

^[2]; Liu, Jinjin ^[3];

^[4]; Huang, Zihao ^[4]; Huai, Linwei ^[5]; Li, Hongyu ^[5]; Wang, Bingqian ^[5]; Shen, Jianchang ^[5]; Ding, Shuhan ^[5]; Li, Zeyu ^[5];

^[5]; Wei, Zhiyuan ^[5]; Miao, Yu ^[5]; Sun, Xiupeng ^[5]; Ou, Zhipeng ^[5];

^[5];

^[6];

^[3] more »

Univ. of Science and Technology of China, Hefei (China); SLAC
Fuzhou Univ. (China)
Beijing Institute of Technology (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics and Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
Univ. of Science and Technology of China, Hefei (China)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

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 CsV_3-xTa_xSb₅ (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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; Innovation Program for Quantum Science and Technology; Anhui Initiative in Quantum Information Technologies; National Key Research and Development Program of China; Beijing Natural Science Foundation; Beijing Institute of Technology (BIT); Chinese Academy of Sciences (CAS)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2000077

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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