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Chin. Phys. B, 2022, Vol. 31(5): 058102    DOI: 10.1088/1674-1056/ac5888
Special Issue: SPECIAL TOPIC — Superconductivity in vanadium-based kagome materials
SPECIAL TOPIC—Superconductivity in vanadium-based kagome materials Prev   Next  

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
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.
Keywords:  CsV3Sb5      4a0 stripe charge order      scanning tunneling microscopy/spectroscopy      charge density wave  
Received:  26 December 2021      Revised:  06 February 2022      Accepted manuscript online: 
PACS:  81.15.-z (Methods of deposition of films and coatings; film growth and epitaxy)  
  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))  
Fund: 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.
Corresponding Authors:  Hui Chen,     E-mail:
About author:  2022-2-25

Cite this article: 

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 2022 Chin. Phys. B 31 058102

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