Superconductivity and nematic order in a new titanium-based kagome metal CsTi3Bi5 without charge density wave order

Haitao Yang, Yuhan Ye, Zhen Zhao, Jiali Liu, Xin-Wei Yi, Yuhang Zhang, Hongqin Xiao, Jinan Shi, Jing-Yang You, Zihao Huang, Bingjie Wang, Jing Wang, Hui Guo, Xiao Lin, Chengmin Shen, Wu Zhou, Hui Chen (), Xiaoli Dong (), Gang Su (), Ziqiang Wang () and Hong-Jun Gao ()
Additional contact information
Haitao Yang: Chinese Academy of Sciences
Yuhan Ye: Chinese Academy of Sciences
Zhen Zhao: Chinese Academy of Sciences
Jiali Liu: Chinese Academy of Sciences
Xin-Wei Yi: University of Chinese Academy of Sciences
Yuhang Zhang: Chinese Academy of Sciences
Hongqin Xiao: Chinese Academy of Sciences
Jinan Shi: University of Chinese Academy of Sciences
Jing-Yang You: University of Chinese Academy of Sciences
Zihao Huang: Chinese Academy of Sciences
Bingjie Wang: Chinese Academy of Sciences
Jing Wang: Chinese Academy of Sciences
Hui Guo: Chinese Academy of Sciences
Xiao Lin: University of Chinese Academy of Sciences
Chengmin Shen: Chinese Academy of Sciences
Wu Zhou: University of Chinese Academy of Sciences
Hui Chen: Chinese Academy of Sciences
Xiaoli Dong: Chinese Academy of Sciences
Gang Su: University of Chinese Academy of Sciences
Ziqiang Wang: Boston College
Hong-Jun Gao: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract The cascade of correlated topological quantum states in the newly discovered vanadium-based kagome superconductors, AV3Sb5 (A = K, Rb, and Cs), with a Z2 topological band structure has sparked immense interest. Here, we report the discovery of superconductivity and electronic nematic order in high-quality single-crystals of a new titanium-based kagome metal, CsTi3Bi5, that preserves the translation symmetry, in stark contrast to the charge density wave superconductor AV3Sb5. Transport and magnetic susceptibility measurements show superconductivity with an onset superconducting transition temperature Tc of approximately 4.8 K. Using the scanning tunneling microscopy/spectroscopy and Josephson scanning tunneling spectroscopy, we demonstrate that the single crystals of CsTi3Bi5 exhibit two distinct superconducting gaps. Furthermore, the superconducting gaps break the six-fold crystal rotational symmetry down to two-fold. At low energies, we find that the quasiparticle interference patterns exhibit rotational-symmetry-breaking C2 patterns, revealing a nematic ordered normal state with the same nematic direction as in the superconducting state. Our findings uncover a novel superconducting state in CsTi3Bi5 and provide new insights for the intrinsic electron liquid crystal phases in kagome superconductors.

Date: 2024
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DOI: 10.1038/s41467-024-53870-6

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