Article Observation of anomalous amplitude modes in the kagome metal CsV3Sb5

Gan Liu ; Xinran Ma ; Kuanyu He ; Qing Li ; Hengxin Tan ; Yizhou Liu ; Jie Xu ; Wenna Tang ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Libo Gao ; Yaomin Dai ; Hai-Hu Wen ; Binghai Yan ; Xiaoxiang Xi

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Gan Liu, Xinran Ma, Kuanyu He, Qing Li, Hengxin Tan, Yizhou Liu, Jie Xu, Wenna Tang, Kenji Watanabe, Takashi Taniguchi, Libo Gao, Yaomin Dai, Hai-Hu Wen, Binghai Yan, Xiaoxiang Xi. Observation of anomalous amplitude modes in the kagome metal CsV3Sb5. Nature Communications. 2022, 13 (1), 3461. https://doi.org/10.1038/s41467-022-31162-1
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(abstract)

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.

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Keyword: Kagome lattice, charge-density wave, electron-phonon coupling

Date published: 2022-06-16

Publisher: Springer Science and Business Media LLC

Journal:

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

Funding:

  • National Natural Science Foundation of China 11774151

Manuscript type: Publisher's version (Version of record)

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

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Updated at: 2025-02-27 12:30:48 +0900

Published on MDR: 2025-02-27 12:30:48 +0900

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