Competing charge-density wave instabilities in the kagome metal ScV<subscript>6</subscript>Sn<subscript>6</subscript>.
In: Nature Communications, Jg. 14 (2023-11-23), Heft 1, S. 1-10
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Zugriff:
Owing to its unique geometry, the kagome lattice hosts various many-body quantum states including frustrated magnetism, superconductivity, and charge-density waves (CDWs). In this work, using inelastic X-ray scattering, we discover a dynamic short-range 3 × 3 × 2 CDW that is dominant in the kagome metal ScV 6 Sn 6 above T CDW ≈ 91 K, competing with the 3 × 3 × 3 CDW that orders below T CDW . The competing CDW instabilities lead to an unusual CDW formation process, with the most pronounced phonon softening and the static CDW occurring at different wavevectors. First-principles calculations indicate that the 3 × 3 × 2 CDW is energetically favored, while a wavevector-dependent electron-phonon coupling (EPC) promotes the 3 × 3 × 3 CDW as the ground state, and leads to enhanced electron scattering above T CDW . These findings underscore EPC-driven correlated many-body physics in ScV 6 Sn 6 and motivate studies of emergent quantum phases in the strong EPC regime. A charge-density wave state was recently reported in the bilayer kagome metal ScV 6 Sn 6 , but its nature is debated. Here, using inelastic X-ray scattering, the authors observe two competing charge-density waves and find the ground state is promoted by a momentum-dependent electron-phonon interaction. [ABSTRACT FROM AUTHOR]
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Titel: |
Competing charge-density wave instabilities in the kagome metal ScV<subscript>6</subscript>Sn<subscript>6</subscript>.
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Autor/in / Beteiligte Person: | Cao, Saizheng ; Xu, Chenchao ; Fukui, Hiroshi ; Manjo, Taishun ; Dong, Ying ; Shi, Ming ; Liu, Yang ; Cao, Chao ; Song, Yu |
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Zeitschrift: | Nature Communications, Jg. 14 (2023-11-23), Heft 1, S. 1-10 |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 2041-1723 (print) |
DOI: | 10.1038/s41467-023-43454-1 |
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