Robustness of the unidirectional stripe order in the kagome superconductor CsV3Sb5

doi:10.1088/1674-1056/ac5888

中国物理B ›› 2022, Vol. 31 ›› Issue (5): 58102-058102.doi: 10.1088/1674-1056/ac5888

所属专题： SPECIAL TOPIC — Superconductivity in vanadium-based kagome materials

Robustness of the unidirectional stripe order in the kagome superconductor CsV₃Sb₅

Bin Hu(胡彬)¹, Yuhan Ye(耶郁晗)¹, Zihao Huang(黄子豪)¹, Xianghe Han(韩相和)¹, Zhen Zhao(赵振)¹, Haitao Yang(杨海涛)^1,3, Hui Chen(陈辉)^1,2,3,†, and Hong-Jun Gao(高鸿钧)^1,2,3

1 Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China;
2 CAS Center for Excellence in Topological Quantum Computation, Beijing 100190, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2021-12-26 修回日期:2022-02-06 发布日期:2022-04-29
通讯作者: Hui Chen,hchenn04@iphy.ac.cn E-mail:hchenn04@iphy.ac.cn
基金资助:
This work was financially supported by the National Key Research and Development Project of China (Grant Nos.2018YFA0305800 and 2019YFA0308500),the National Natural Science Foundation of China (Grant Nos.61888102 and 52022105),the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos.XDB30000000 and XDB28000000),CAS Project for Young Scientists in Basic Research (Grant No.YSBR-003),and the University of Chinese Academy of Sciences.

Robustness of the unidirectional stripe order in the kagome superconductor CsV₃Sb₅

1 Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China;
2 CAS Center for Excellence in Topological Quantum Computation, Beijing 100190, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2021-12-26 Revised:2022-02-06 Published:2022-04-29
Contact: Hui Chen,hchenn04@iphy.ac.cn E-mail:hchenn04@iphy.ac.cn
About author:2022-2-25
Supported by:
This work was financially supported by the National Key Research and Development Project of China (Grant Nos.2018YFA0305800 and 2019YFA0308500),the National Natural Science Foundation of China (Grant Nos.61888102 and 52022105),the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos.XDB30000000 and XDB28000000),CAS Project for Young Scientists in Basic Research (Grant No.YSBR-003),and the University of Chinese Academy of Sciences.

摘要/Abstract

摘要： V-based kagome materials AV₃Sb₅ (A=K, Rb, Cs) have attracted much attention due to their novel properties such as unconventional superconductivity, giant anomalous Hall effect, charge density wave (CDW) and pair density wave. Except for the 2a₀×2a₀ CDW (charge density wave with in-plane 2×2 superlattice modulation) in AV₃Sb₅, an additional 1×4 (4a₀) unidirectional stripe order has been observed at the Sb surface of RbV₃Sb₅ and CsV₃Sb₅. However, the stability and electronic nature of the 4a₀ stripe order remain controversial and unclear. Here, by using low-temperature scanning tunneling microscopy/spectroscopy (STM/S), we systematically study the 4a₀ stripe order on the Sb-terminated surface of CsV₃Sb₅. We find that the 4a₀ stripe order is visible in a large energy range. The STM images with positive and negative bias show contrast inversion, which is the hallmark for the Peierls-type CDW. In addition, below the critical temperature about 60 K, the 4a₀ stripe order keeps unaffected against the topmost Cs atoms, point defects, step edges and magnetic field up to 8 T. Our results provide experimental evidences on the existence of unidirectional CDW in CsV₃Sb₅.

关键词: CsV₃Sb₅, 4a₀ stripe charge order, scanning tunneling microscopy/spectroscopy, charge density wave

Abstract: V-based kagome materials AV₃Sb₅ (A=K, Rb, Cs) have attracted much attention due to their novel properties such as unconventional superconductivity, giant anomalous Hall effect, charge density wave (CDW) and pair density wave. Except for the 2a₀×2a₀ CDW (charge density wave with in-plane 2×2 superlattice modulation) in AV₃Sb₅, an additional 1×4 (4a₀) unidirectional stripe order has been observed at the Sb surface of RbV₃Sb₅ and CsV₃Sb₅. However, the stability and electronic nature of the 4a₀ stripe order remain controversial and unclear. Here, by using low-temperature scanning tunneling microscopy/spectroscopy (STM/S), we systematically study the 4a₀ stripe order on the Sb-terminated surface of CsV₃Sb₅. We find that the 4a₀ stripe order is visible in a large energy range. The STM images with positive and negative bias show contrast inversion, which is the hallmark for the Peierls-type CDW. In addition, below the critical temperature about 60 K, the 4a₀ stripe order keeps unaffected against the topmost Cs atoms, point defects, step edges and magnetic field up to 8 T. Our results provide experimental evidences on the existence of unidirectional CDW in CsV₃Sb₅.

Key words: CsV₃Sb₅, 4a₀ stripe charge order, scanning tunneling microscopy/spectroscopy, charge density wave

中图分类号: (Methods of deposition of films and coatings; film growth and epitaxy)

81.15.-z

81.05.Zx (New materials: theory, design, and fabrication) 68.37.Ef (Scanning tunneling microscopy (including chemistry induced with STM)) 68.37.Ps (Atomic force microscopy (AFM))

Bin Hu(胡彬), Yuhan Ye(耶郁晗), Zihao Huang(黄子豪), Xianghe Han(韩相和), Zhen Zhao(赵振),Haitao Yang(杨海涛), Hui Chen(陈辉), and Hong-Jun Gao(高鸿钧). Robustness of the unidirectional stripe order in the kagome superconductor CsV₃Sb₅[J]. 中国物理B, 2022, 31(5): 58102-058102.

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Robustness of the unidirectional stripe order in the kagome superconductor CsV₃Sb₅

Robustness of the unidirectional stripe order in the kagome superconductor CsV₃Sb₅

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