Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals
Abstract The charge density wave (CDW), as a hallmark of vanadium-based kagome superconductor AV 3 Sb 5 (A = K, Rb, Cs), has attracted intensive attention. However, the fundamental controversy regarding the underlying mechanism of CDW therein persists. Recently, the vanadium-based bi-layered kagome metal ScV 6 Sn 6 , reported to exhibit a long-range charge order below 94 K, has emerged as a promising candidate to further clarify this core issue. Here, employing micro-focusing angle-resolved photoemission spectroscopy (μ-ARPES) and first-principles calculations, we systematically studied the unique CDW order in vanadium-based bi-layered kagome metals by comparing ScV 6 Sn 6 with its isostructural counterpart YV 6 Sn 6 , which lacks a CDW ground state. Combining ARPES data and the corresponding joint density of states (DOS), we suggest that the VHS nesting mechanism might be invalid in these materials. Besides, in ScV 6 Sn 6 , we identified multiple hybridization energy gaps resulting from CDW-induced band folding, along with an anomalous band dispersion, implying a potential electron-phonon coupling-driven mechanism underlying the formation of the CDW order. Our finding not only comprehensively maps the electronic structure of V-based bi-layer kagome metals but also provides constructive experimental evidence for the unique origin of CDW in this system.
Authors
- Soonsang Huh (ORCID: https://orcid.org/0000-0002-5555-425X)
- Zhengtai Liu (ORCID: https://orcid.org/0000-0002-3328-165X)
- Yichen Yang (ORCID: https://orcid.org/0000-0002-3365-7178)
- Dawei Shen (ORCID: https://orcid.org/0000-0003-2402-7956)
- Yanfeng Guo (ORCID: https://orcid.org/0000-0002-9386-4857)
- Tongrui Li (ORCID: https://orcid.org/0009-0002-4214-2018)
- Xiangqi Liu (ORCID: https://orcid.org/0000-0002-2431-3349)
- Zhicheng Jiang (ORCID: https://orcid.org/0000-0001-7407-1176)
- Jian-Yang Ding
- Zicheng Tao (ORCID: https://orcid.org/0000-0002-6807-7667)
- Wei Xia (ORCID: https://orcid.org/0000-0003-2108-0807)
- Yilin Wang (ORCID: https://orcid.org/0000-0002-3386-5380)
- Mao Ye (ORCID: https://orcid.org/0000-0002-7078-2402)
- Soohyun Cho (ORCID: https://orcid.org/0009-0000-1102-9632)
- Zhe Sun (ORCID: https://orcid.org/0009-0003-2267-9966)
- Yu-Ming Shi
- Takeshi Kondo (ORCID: https://orcid.org/0009-0006-4585-9494)
- Jishan Liu
- Wen-Chuan Jing
- Yu Huang
- Jiayu Liu (ORCID: https://orcid.org/0000-0002-4172-8802)
Institutions
- University of Science and Technology of China (CN)
- Hefei University of Technology (CN)
- Chinese Academy of Sciences (CN)
- Sunchon National University (KR)
- ShanghaiTech University (CN)
- Shanghai Advanced Research Institute (CN)
- Shanghai Institute of Microsystem and Information Technology (CN)
- National Synchrotron Radiation Laboratory (CN)
- University of Chinese Academy of Sciences (CN)
- The University of Tokyo (JP)
Publication Details
- Journal
- NPG Asia Materials
- Published
- 2024-09-19
- DOI
- https://doi.org/10.1038/s41427-024-00567-3
- Citations
- 3
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 0.93
Funders
- National Science Foundation
- National Natural Science Foundation of China
- Japan Society for the Promotion of Science
- National Postdoctoral Program for Innovative Talents