Frustrated phonon with charge density wave in vanadium Kagome metal

Seung-Phil Heo, Choongjae Won, Heemin Lee, Hanbyul Kim, Eunyoung Park, Sung Yun Lee, Junha Hwang, Hyeongi Choi, Sang-Youn Park, Byungjune Lee, Woo-Suk Noh, Hoyoung Jang, Jae-Hoon Park, Dongbin Shin () and Changyong Song ()
Additional contact information
Seung-Phil Heo: POSTECH
Choongjae Won: Max Planck POSTECH/Korea Research Initiative
Heemin Lee: POSTECH
Hanbyul Kim: Gwangju Institute of Science and Technology
Eunyoung Park: POSTECH
Sung Yun Lee: POSTECH
Junha Hwang: POSTECH
Hyeongi Choi: POSTECH
Sang-Youn Park: POSTECH
Byungjune Lee: POSTECH
Woo-Suk Noh: Max Planck POSTECH/Korea Research Initiative
Hoyoung Jang: POSTECH 37673
Jae-Hoon Park: POSTECH
Dongbin Shin: Gwangju Institute of Science and Technology
Changyong Song: POSTECH

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract The formation of a star-of-David charge density wave superstructure, resulting from the coordinated displacements of vanadium ions on a corner-sharing triangular lattice, has garnered significant attention to comprehend the influence of electron–phonon interaction within geometrically intricate lattice of Kagome metals, specifically AV3Sb5 (where A represents K, Rb, or Cs). However, understanding of the underlying mechanism behind charge density wave formation, coupled with symmetry-protected lattice vibrations, remains elusive. Here, from femtosecond time-resolved X-ray scattering experiments, we reveal that the phonon mode, associated with cesium ions’ out-of-plane motion, becomes frustrated in the charge density wave phase. Furthermore, we observed the photoinduced emergence of a metastable charge density wave phase, facilitated by alleviating the frustration. By not only elucidating the longstanding puzzle surrounding the intervention of phonons but introducing the phononic frustration, this research offers insights into the competition between phonons and periodic lattice distortions, a phenomenon widespread in other correlated quantum materials including layered high-temperature superconductors.

Date: 2025
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DOI: 10.1038/s41467-025-60219-0

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