Observation of a long-range unidirectional charge density wave in kagome superconductor KV3Sb5

doi:10.1088/1674-1056/add7ad

中国物理B ›› 2025, Vol. 34 ›› Issue (7): 77101-077101.doi: 10.1088/1674-1056/add7ad

所属专题： SPECIAL TOPIC — Recent progress on kagome metals and superconductors

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

收稿日期:2025-04-14 修回日期:2025-05-08 接受日期:2025-05-13 出版日期:2025-06-18 发布日期:2025-07-03
通讯作者: Geng Li, Xiao Lin E-mail:gengli.iop@iphy.ac.cn;xlin@ucas.ac.cn
基金资助:
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).

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

Received:2025-04-14 Revised:2025-05-08 Accepted:2025-05-13 Online:2025-06-18 Published:2025-07-03
Contact: Geng Li, Xiao Lin E-mail:gengli.iop@iphy.ac.cn;xlin@ucas.ac.cn
Supported by:
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).

摘要/Abstract

摘要： 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$_{5}$.

关键词: kagome superconductor, KV$_3$Sb$_5$, charge density wave, unidirectional strain

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$_{5}$.

Key words: kagome superconductor, KV$_3$Sb$_5$, charge density wave, unidirectional strain

中图分类号: (Charge-density-wave systems)

71.45.Lr

74.55.+v (Tunneling phenomena: single particle tunneling and STM) 74.70.-b (Superconducting materials other than cuprates)

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[J]. 中国物理B, 2025, 34(7): 77101-077101.

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Observation of a long-range unidirectional charge density wave in kagome superconductor KV₃Sb₅

Observation of a long-range unidirectional charge density wave in kagome superconductor KV₃Sb₅

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