| SPECIAL TOPIC — Recent progress on kagome metals and superconductors |
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Emergent 3×3 charge order on the Cs reconstruction of kagome superconductor CsV3Sb5 |
| Xianghe Han(韩相和)1,2, Zhongyi Cao(曹钟一)1,2, Zihao Huang(黄子豪)1,2, Zhen Zhao(赵振)1,2, Haitao Yang(杨海涛)1,2,3, Hui Chen(陈辉)1,2,3,‡, and Hong-Jun Gao(高鸿钧)1,2,3,† |
1 Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Hefei National Laboratory, Hefei 230088, China |
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Abstract The alkali adatoms with controlled coverage on the surface have been demonstrated to effectively tune the surface band of quantum materials through in situ electron doping. However, the interplay of orderly arranged alkali adatoms with the surface states of quantum materials remains unexplored. Here, by using low-temperature scanning tunneling microscopy/spectroscopy (STM/S), we observed the emergent 3$\times$3 super modulation of electronic states on the $\sqrt 3\times\sqrt 3R30^\circ$ (R3) Cs ordered surface of kagome superconductor CsV$_{3}$Sb$_{5}$. The nondispersive 3$\times$3 superlattice at R3 ordered surface shows contrast inversion in positive and negative differential conductance maps, indicating a charge order origin. The 3$\times$3 charge order is suppressed with increasing temperature and undetectable at a critical temperature of $\sim 62$ K. Furthermore, in the Ta substituted sample CsV$_{2.6}$Ta$_{0.4}$Sb$_{5}$, where long-range 2$\times$2$\times$2 charge density wave is significantly suppressed, the 3$\times$3 charge order on the R3 ordered surface becomes blurred and much weaker than that in the undoped sample. It indicates that the 3$\times$3 charge order on the R3 ordered surface is directly correlated to the bulk charge density waves in CsV$_{3}$Sb$_{5}$. Our work provides a new platform for understanding and manipulating the cascade of charge orders in kagome superconductors.
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Received: 28 September 2024
Revised: 02 November 2024
Accepted manuscript online: 07 November 2024
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PACS:
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68.37.Ef
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(Scanning tunneling microscopy (including chemistry induced with STM))
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68.37.Ps
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(Atomic force microscopy (AFM))
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81.15.-z
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(Methods of deposition of films and coatings; film growth and epitaxy)
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81.05.Zx
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(New materials: theory, design, and fabrication)
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| Fund: Project supported by the National Key Research and Development Project of China (Grant Nos. 2022YFA1204100 and 2019YFA0308500), the National Natural Science Foundation of China (Grant No. 62488201), the CAS Project for Young Scientists in Basic Research (Grant No. YSBR-003), and the Innovation Program of Quantum Science and Technology (Grant No. 2021ZD0302700). |
Corresponding Authors:
Hong-Jun Gao, Hui Chen
E-mail: hjgao@iphy.ac.cn;hchenn04@iphy.ac.cn
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Cite this article:
Xianghe Han(韩相和), Zhongyi Cao(曹钟一), Zihao Huang(黄子豪), Zhen Zhao(赵振), Haitao Yang(杨海涛), Hui Chen(陈辉), and Hong-Jun Gao(高鸿钧) Emergent 3×3 charge order on the Cs reconstruction of kagome superconductor CsV3Sb5 2025 Chin. Phys. B 34 016801
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