Robustness of the unidirectional stripe order in the kagome superconductor CsV3Sb5

doi:10.1088/1674-1056/ac5888

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,hchenn04@iphy.ac.cn
E-mail: hchenn04@iphy.ac.cn

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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Robustness of the unidirectional stripe order in the kagome superconductor CsV3Sb5

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Robustness of the unidirectional stripe order in the kagome superconductor CsV₃Sb₅