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Special Issue:
SPECIAL TOPIC — Recent progress on kagome metals and superconductors
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| SPECIAL TOPIC — Recent progress on kagome metals and superconductors |
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Nontrivial Fermi surface topology in kagome superconductor CsTi3Bi5 revealed by de Haas-van Alphen oscillation |
| Yuhang Zhang(张宇航)1,2,†,‡, Xinwei Yi(易鑫伟)2,†, Zhen Zhao(赵振)1,2,†, Jiali Liu(刘家利)1,2, Aini Xu(胥艾妮)1,2, Dong Li(李栋)6, Zouyouwei Lu(鲁邹有为)1,2, Yue Liu(刘樾)1,2, Jihu Lu(卢佶虎)1,2, Hua Zhang(张华)1,2, Hui Chen(陈辉)1,2,4, Shiliang Li(李世亮)1,2,3, Ziyi Liu(刘子儀)1, Jinguang Cheng(程金光)1,2, Gang Su(苏刚)2,5,7,§, Haitao Yang(杨海涛)1,2,4,¶, Xiaoli Dong(董晓莉)1,2,3,#, Hong-Jun Gao(高鸿钧)1,2,4, and Zhongxian Zhao(赵忠贤)1,2,3 |
1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China;
4 CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China;
5 Kavli Institute for Theoretical Sciences, CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China;
6 RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;
7 CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract The kagome lattice, naturally encompassing Dirac fermions, flat bands, and van Hove singularities, tends to intertwine exotic electronic states. Revealing the characteristics of its Fermi surface will help clarify the nature of the complex quantum phenomena in kagome material. Here we report the Fermi surface properties of the novel kagome metal CsTi$_{{3}}$Bi$_{{5}}$ by the de Haas-van Alphen oscillations. The observed oscillations are clear and consist of six principal frequencies ranging from 214 T to 1013 T. The angular dependence of the frequency implies a quasi-two-dimensional electronic structure. In addition, the geometry phase corresponding to 281 T, determined by direct Lifshitz-Kosevich formula fitting, yields a value close to $\pi $, which may indicate a band structure with nontrivial topological property. These results underscore the potential of CsTi$_{{3}}$Bi$_{{5}}$ as a promising platform to explore the interplay between topological order, electronic nematicity, and superconductivity.
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Received: 22 January 2025
Revised: 29 March 2025
Accepted manuscript online: 02 April 2025
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PACS:
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71.18.+y
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(Fermi surface: calculations and measurements; effective mass, g factor)
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74.70.-b
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(Superconducting materials other than cuprates)
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74.25.-q
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(Properties of superconductors)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1403903, 2023YFA1406100, 2018YFA0305800, and 2022YFA1204100), the National Natural Science Foundation of China (Grant Nos. 12304075, 11834014, 61888102, and 12447101), Chinese Academy of Sciences (Grant Nos. XDB33010200 and 2022YSBR-048), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB28000000), and the National Science and Technology Major Project (Grant No. 2024ZD0300500). |
Corresponding Authors:
Yuhang Zhang, Gang Su, Haitao Yang, Xiaoli Dong
E-mail: yuhang@iphy.ac.cn;gsu@ucas.ac.cn;htyang@iphy.ac.cn;dong@iphy.ac.cn
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Cite this article:
Yuhang Zhang(张宇航), Xinwei Yi(易鑫伟), Zhen Zhao(赵振), Jiali Liu(刘家利), Aini Xu(胥艾妮), Dong Li(李栋), Zouyouwei Lu(鲁邹有为), Yue Liu(刘樾), Jihu Lu(卢佶虎), Hua Zhang(张华), Hui Chen(陈辉), Shiliang Li(李世亮), Ziyi Liu(刘子儀), Jinguang Cheng(程金光), Gang Su(苏刚), Haitao Yang(杨海涛), Xiaoli Dong(董晓莉), Hong-Jun Gao(高鸿钧), and Zhongxian Zhao(赵忠贤) Nontrivial Fermi surface topology in kagome superconductor CsTi3Bi5 revealed by de Haas-van Alphen oscillation 2025 Chin. Phys. B 34 077107
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