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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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Observation of a long-range unidirectional charge density wave in kagome superconductor KV3Sb5 |
| Xingwei Shi(石兴伟)1,2,†, Xiao Liu(刘潇)1,2,†, Geng Li(李更)1,2,3,‡, Zhen Zhao(赵振)1,2, Haitao Yang(杨海涛)1,2,3, Xiao Lin(林晓)2,§, and Hong-Jun Gao(高鸿钧)1,2,3 |
1 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
2 Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Hefei National Laboratory, Hefei 230088, China |
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Abstract The interplay between 2$a_{0}\times2a_{0}$ charge density wave (CDW), nematicity and superconductivity in $A$V$_{3}$Sb$_{5}$ ($A = {\rm K}$, Rb, Cs) compounds gives rise to a rich landscape of intriguing physical phenomena. In addition to the 2$a_{0}\times2a_{0}$ CDW, a unidirectional 4$a_{0}$ stripe CDW is also observed on the Sb surface of RbV$_{3}$Sb$_{5}$ and CsV$_{3}$Sb$_{5}$. However, reports of stripe-like CDWs in KV$_{3}$Sb$_{5}$ have been limited. Here, we report the first observation of a long-range unidirectional stripe order with a $6a_{0}$ modulation period on the Sb surface of KV$_{3}$Sb$_{5}$, coexisting with the $2a_{0} \times 2a_{0}$ CDW. Notably, the intensity of the $6a_{0}$ stripes in STM topographies exhibits pronounced contrast reversal between opposite bias voltages. Additionally, the wave vector of the $6a_{0}$ modulation shows no energy-dependent dispersion, confirming its CDW origin. Furthermore, the $6a_{0}$ CDW is robust under a 7 T out-of-plane magnetic field and persists over a temperature range from 215 mK to 720 mK. These results provide compelling evidence for the emergence of a long-range unidirectional CDW in KV$_{3}$Sb$_{5}$.
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Received: 14 April 2025
Revised: 08 May 2025
Accepted manuscript online: 13 May 2025
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PACS:
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71.45.Lr
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(Charge-density-wave systems)
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74.55.+v
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(Tunneling phenomena: single particle tunneling and STM)
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74.70.-b
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(Superconducting materials other than cuprates)
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| Fund: Project supported by the National Key Research and Development Project of China (Grant Nos. 2024YFA1207700 and 2022YFA1204100), the National Natural Science Foundation of China (Grant No. 62488201), the CAS Project for Young Scientists in Basic Research (Grant No. YSBR-003), the Youth Innovation Promotion Association (Grant No. 2023005), and the Innovation Program of Quantum Science and Technology (Grant No. 2021ZD0302700). |
Corresponding Authors:
Geng Li, Xiao Lin
E-mail: gengli.iop@iphy.ac.cn;xlin@ucas.ac.cn
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Cite this article:
Xingwei Shi(石兴伟), Xiao Liu(刘潇), Geng Li(李更), Zhen Zhao(赵振), Haitao Yang(杨海涛), Xiao Lin(林晓), and Hong-Jun Gao(高鸿钧) Observation of a long-range unidirectional charge density wave in kagome superconductor KV3Sb5 2025 Chin. Phys. B 34 077101
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