Superconductivity and orbital-selective nematic order in a new titanium-based kagome metal CsTi3Bi5
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arXiv
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| Natura: | Preprint |
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2022
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| author | Yang, Haitao Ye, Yuhan Zhao, Zhen Liu, Jiali Yi, Xin-Wei Zhang, Yuhang Shi, Jinan You, Jing-Yang Huang, Zihao Wang, Bingjie Wang, Jing Guo, Hui Lin, Xiao Shen, Chengmin Zhou, Wu Chen, Hui Dong, Xiaoli Su, Gang Wang, Ziqiang Gao, Hong-Jun |
| author_facet | Yang, Haitao Ye, Yuhan Zhao, Zhen Liu, Jiali Yi, Xin-Wei Zhang, Yuhang Shi, Jinan You, Jing-Yang Huang, Zihao Wang, Bingjie Wang, Jing Guo, Hui Lin, Xiao Shen, Chengmin Zhou, Wu Chen, Hui Dong, Xiaoli Su, Gang Wang, Ziqiang Gao, Hong-Jun |
| contents | Fabrication of new types of superconductors with novel physical properties has always been a major thread in the research of superconducting materials. An example is the enormous interests generated by 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. Here we report the successful fabrication of single-crystals of titanium-based kagome metal CsTi3Bi5 and the observation of superconductivity and electronic nematicity. The onset of the superconducting transition temperature Tc is around 4.8 K. In sharp contrast to the charge density wave superconductor AV3Sb5, we find that the kagome superconductor CsTi3Bi5 preserves translation symmetry, but breaks rotational symmetry and exhibits an electronic nematicity. The angular-dependent magnetoresistivity shows a remarkable two-fold rotational symmetry as the magnetic field rotates in the kagome plane. The scanning tunneling microscopy and spectroscopic imaging detect rotational-symmetry breaking C2 quasiparticle interference patterns (QPI) at low energies, providing further microscopic evidence for electronic nematicity. Combined with first-principle calculations, we find that the nematic QPI is orbital-selective and dominated by the Ti dxz and dyz orbitals, possibly originating from the intriguing orbital bond nematic order. Our findings in the new "135" material CsTi3Bi5 provide new directions for exploring the multi-orbital correlation effect and the role of orbital or bond order in the electron liquid crystal phases evidenced by the symmetry breaking states in kagome superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2211_12264 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Superconductivity and orbital-selective nematic order in a new titanium-based kagome metal CsTi3Bi5 Yang, Haitao Ye, Yuhan Zhao, Zhen Liu, Jiali Yi, Xin-Wei Zhang, Yuhang Shi, Jinan You, Jing-Yang Huang, Zihao Wang, Bingjie Wang, Jing Guo, Hui Lin, Xiao Shen, Chengmin Zhou, Wu Chen, Hui Dong, Xiaoli Su, Gang Wang, Ziqiang Gao, Hong-Jun Superconductivity Fabrication of new types of superconductors with novel physical properties has always been a major thread in the research of superconducting materials. An example is the enormous interests generated by 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. Here we report the successful fabrication of single-crystals of titanium-based kagome metal CsTi3Bi5 and the observation of superconductivity and electronic nematicity. The onset of the superconducting transition temperature Tc is around 4.8 K. In sharp contrast to the charge density wave superconductor AV3Sb5, we find that the kagome superconductor CsTi3Bi5 preserves translation symmetry, but breaks rotational symmetry and exhibits an electronic nematicity. The angular-dependent magnetoresistivity shows a remarkable two-fold rotational symmetry as the magnetic field rotates in the kagome plane. The scanning tunneling microscopy and spectroscopic imaging detect rotational-symmetry breaking C2 quasiparticle interference patterns (QPI) at low energies, providing further microscopic evidence for electronic nematicity. Combined with first-principle calculations, we find that the nematic QPI is orbital-selective and dominated by the Ti dxz and dyz orbitals, possibly originating from the intriguing orbital bond nematic order. Our findings in the new "135" material CsTi3Bi5 provide new directions for exploring the multi-orbital correlation effect and the role of orbital or bond order in the electron liquid crystal phases evidenced by the symmetry breaking states in kagome superconductors. |
| title | Superconductivity and orbital-selective nematic order in a new titanium-based kagome metal CsTi3Bi5 |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2211.12264 |