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Publication date: Mar 03, 2024
Charge density wave (CDW) orders in vanadium-based kagome metals have recently received tremendous attention, yet their origin remains a topic of debate. The discovery of ScV₆Sn₆, a bilayer kagome metal featuring an intriguing √3 x √3 x 3 CDW order, offers a novel platform to explore the underlying mechanism behind the unconventional CDW. Here, we combine high-resolution angle-resolved photoemission spectroscopy, Raman scattering and density functional theory to investigate the electronic structure and phonon modes of ScV₆Sn₆. We identify topologically nontrivial surface states and multiple van Hove singularities (VHSs) in the vicinity of the Fermi level, with one VHS aligning with the in-plane component of the CDW vector near the K ̅ point. Additionally, Raman measurements indicate a strong electron-phonon coupling, as evidenced by a two-phonon mode and new emergent modes. Our findings highlight the fundamental role of lattice degrees of freedom in promoting the CDW in ScV₆Sn₆.
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File name | Size | Description |
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Orbital Resolved Band Structure of ScV6Sn6.zip
MD5md5:e9916750c133b1eb8902f96d87878624
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76.9 KiB | Orbital Resolved Band Structure of ScV6Sn6 |
resistivity.xlsx
MD5md5:b6eeb137b812da28fce54af46d0c480e
|
124.7 KiB | Ab-plane resistivity of ScV6Sn6 |
HC.xlsx
MD5md5:7b1db9c5daa0fae3d20f6acdd26bf176
|
16.5 KiB | Specific heat capacity of ScV6Sn6 |
2024.42 (version v1) [This version] | Mar 03, 2024 | DOI10.24435/materialscloud:tw-tw |