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The charge-density wave (CDW) phase is often accompanied by the condensation of a soft acoustic phonon mode, giving rise to lattice distortion and charge density modulation. This picture was challenged for the recently discovered kagome metal CsV3Sb5, based on the evidence of absence of soft phonons. Here we report the observation of Raman-active CDW amplitude modes in this ma- terial, which are collective excitations typically thought to emerge out of frozen soft phonons. The amplitude modes strongly hybridize with other superlattice modes, imparting them with clear temperature-dependent frequency shift and broadening, rarely seen in other known CDW materials. Both the mode mixing and the large amplitude mode frequencies suggest that the CDW exhibits the character of strong electron-phonon coupling, a regime in which acoustic phonon softening can cease to exist. The observation of amplitude modes in the absence of soft phonons highlights the unconventional nature of the CDW in CsV3Sb5.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Kagome lattice, charge-density wave, electron-phonon coupling

刊行年月日: 2022-06-16

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 13 issue. 1 3461

研究助成金:

• National Natural Science Foundation of China 11774151

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-022-31162-1

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更新時刻: 2025-02-27 12:30:48 +0900

MDRでの公開時刻: 2025-02-27 12:30:48 +0900