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

The cascade of correlated topological quantum states in the newly discovered vanadium-based kagome superconductors, AV<sub>3</sub>Sb<sub>5</sub> (A = K, Rb, and Cs), with a Z<sub>2</sub> 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, CsTi<sub>3</sub>Bi<sub>5</sub>, that preserves the translation symmetry, in stark contrast to the charge density wave superconductor AV<sub>3</sub>Sb<sub>5</sub>. Transport and magnetic susceptibility measurements show superconductivity with an onset superconducting transition temperature T<sub>c</sub> of approximately 4.8 K. Using the scanning tunneling microscopy/spectroscopy and Josephson scanning tunneling spectroscopy, we demonstrate that the single crystals of CsTi<sub>3</sub>Bi<sub>5</sub> 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 C<sub>2</sub> 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 CsTi<sub>3</sub>Bi<sub>5</sub> and provide new insights for the intrinsic electron liquid crystal phases in kagome superconductors.

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Publication Details

Journal
Nature Communications
Published
2024-11-07
DOI
https://doi.org/10.1038/s41467-024-53870-6
Citations
39
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
13.17

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article

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

Xiaoli Dong, Gang Su, Hui Nan Guo, Chengmin Shen et al.
39 citations
Nature Communications
Topological Materials and Phenomena
13.17
article

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

Xiaoli Dong, Gang Su, Hui Nan Guo, Chengmin Shen, Haitao Yang, Jinan Shi, Xiao Lin, Xin-Wei Yi, Jing‐Yang You, Wu Zhou, Hui Chen, Jing Wang, Ziqiang Wang, Jiali Liu, Zhen Zhao, Bingjie Wang, Zihao Huang, Yuhang Zhang, Hongqin Xiao, Yuhan Ye
article en
39 citations

Abstract

The cascade of correlated topological quantum states in the newly discovered vanadium-based kagome superconductors, AV<sub>3</sub>Sb<sub>5</sub> (A = K, Rb, and Cs), with a Z<sub>2</sub> 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, CsTi<sub>3</sub>Bi<sub>5</sub>, that preserves the translation symmetry, in stark contrast to the charge density wave superconductor AV<sub>3</sub>Sb<sub>5</sub>. Transport and magnetic susceptibility measurements show superconductivity with an onset superconducting transition temperature T<sub>c</sub> of approximately 4.8 K. Using the scanning tunneling microscopy/spectroscopy and Josephson scanning tunneling spectroscopy, we demonstrate that the single crystals of CsTi<sub>3</sub>Bi<sub>5</sub> 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 C<sub>2</sub> 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 CsTi<sub>3</sub>Bi<sub>5</sub> and provide new insights for the intrinsic electron liquid crystal phases in kagome superconductors.

Nature CommunicationsVol. 15(1)
Boston College (US), Chinese Academy of Sciences (CN), Songshan Lake Materials Laboratory (CN), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Institute of Physics (CN), National Laboratory for Superconductivity (CN), University of Chinese Academy of Sciences (CN)
U.S. Department of Energy, Research Corporation for Science Advancement, National Natural Science Foundation of China, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Basic Energy Sciences
Openalex Percentile: Top 1%
Topological Materials and Phenomena
13.17
DOIOpen Access PDFOpenAlex
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