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 AV3Sb5 (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 met...
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Nature Portfolio
2024-09-01
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| Series: | NPG Asia Materials |
| Online Access: | https://doi.org/10.1038/s41427-024-00567-3 |
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| author | Yi-Chen Yang Soohyun Cho Tong-Rui Li Xiang-Qi Liu Zheng-Tai Liu Zhi-Cheng Jiang Jian-Yang Ding Wei Xia Zi-Cheng Tao Jia-Yu Liu Wen-Chuan Jing Yu Huang Yu-Ming Shi Soonsang Huh Takeshi Kondo Zhe Sun Ji-Shan Liu Mao Ye Yi-Lin Wang Yan-Feng Guo Da-Wei Shen |
| author_facet | Yi-Chen Yang Soohyun Cho Tong-Rui Li Xiang-Qi Liu Zheng-Tai Liu Zhi-Cheng Jiang Jian-Yang Ding Wei Xia Zi-Cheng Tao Jia-Yu Liu Wen-Chuan Jing Yu Huang Yu-Ming Shi Soonsang Huh Takeshi Kondo Zhe Sun Ji-Shan Liu Mao Ye Yi-Lin Wang Yan-Feng Guo Da-Wei Shen |
| author_sort | Yi-Chen Yang |
| collection | DOAJ |
| description | Abstract The charge density wave (CDW), as a hallmark of vanadium-based kagome superconductor AV3Sb5 (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 ScV6Sn6, 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 ScV6Sn6 with its isostructural counterpart YV6Sn6, 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 ScV6Sn6, 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. |
| format | Article |
| id | doaj-art-600dbf0d966d4010abf9436fb3876513 |
| institution | Kabale University |
| issn | 1884-4057 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | NPG Asia Materials |
| spelling | doaj-art-600dbf0d966d4010abf9436fb38765132025-01-19T12:28:25ZengNature PortfolioNPG Asia Materials1884-40572024-09-011611910.1038/s41427-024-00567-3Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metalsYi-Chen Yang0Soohyun Cho1Tong-Rui Li2Xiang-Qi Liu3Zheng-Tai Liu4Zhi-Cheng Jiang5Jian-Yang Ding6Wei Xia7Zi-Cheng Tao8Jia-Yu Liu9Wen-Chuan Jing10Yu Huang11Yu-Ming Shi12Soonsang Huh13Takeshi Kondo14Zhe Sun15Ji-Shan Liu16Mao Ye17Yi-Lin Wang18Yan-Feng Guo19Da-Wei Shen20National Synchrotron Radiation Laboratory, University of Science and Technology of ChinaDepartment of Physics Education, Sunchon National UniversityNational Synchrotron Radiation Laboratory, University of Science and Technology of ChinaSchool of Physical Science and Technology, ShanghaiTech UniversityShanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of SciencesNational Synchrotron Radiation Laboratory, University of Science and Technology of ChinaNational Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of SciencesSchool of Physical Science and Technology, ShanghaiTech UniversitySchool of Physical Science and Technology, ShanghaiTech UniversityNational Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of SciencesNational Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of SciencesNational Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of SciencesNational Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of SciencesInstitute for Solid State Physics, University of TokyoInstitute for Solid State Physics, University of TokyoNational Synchrotron Radiation Laboratory, University of Science and Technology of ChinaShanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of SciencesShanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of SciencesSchool of Emerging Technology, University of Science and Technology of ChinaSchool of Physical Science and Technology, ShanghaiTech UniversityNational Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of ChinaAbstract The charge density wave (CDW), as a hallmark of vanadium-based kagome superconductor AV3Sb5 (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 ScV6Sn6, 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 ScV6Sn6 with its isostructural counterpart YV6Sn6, 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 ScV6Sn6, 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.https://doi.org/10.1038/s41427-024-00567-3 |
| spellingShingle | Yi-Chen Yang Soohyun Cho Tong-Rui Li Xiang-Qi Liu Zheng-Tai Liu Zhi-Cheng Jiang Jian-Yang Ding Wei Xia Zi-Cheng Tao Jia-Yu Liu Wen-Chuan Jing Yu Huang Yu-Ming Shi Soonsang Huh Takeshi Kondo Zhe Sun Ji-Shan Liu Mao Ye Yi-Lin Wang Yan-Feng Guo Da-Wei Shen Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals NPG Asia Materials |
| title | Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals |
| title_full | Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals |
| title_fullStr | Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals |
| title_full_unstemmed | Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals |
| title_short | Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals |
| title_sort | unveiling the charge density wave mechanism in vanadium based bi layered kagome metals |
| url | https://doi.org/10.1038/s41427-024-00567-3 |
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