Softening of a flat phonon mode in the kagome ScV6Sn6

Korshunov, A.; Hu, H.; Subires, D.; Jiang, Y.; Călugăru, D.; Feng, X.; Rajapitamahuni, A.; Yi, C.; Roychowdhury, S.; Vergniory, M. G.; Strempfer, J.; Shekhar, C.; Vescovo, E.; Chernyshov, D.; Said, A. H.; Bosak, A.; Felser, C.; Bernevig, B. Andrei; Blanco-Canosa, S.

doi:10.1038/s41467-023-42186-6

Softening of a flat phonon mode in the kagome ScV₆Sn₆

Journal Article · Fri Oct 20 00:00:00 EDT 2023 · Nature Communications

DOI:https://doi.org/10.1038/s41467-023-42186-6· OSTI ID:2204335

^[1]; Hu, H. ^[2]; Subires, D. ^[2]; Jiang, Y. ^[3]; ^[4]; Feng, X. ^[5]; Rajapitamahuni, A. ^[6]; Yi, C. ^[7]; ^[7]; Vergniory, M. G. ^[5]; ^[8]; ^[7]; Vescovo, E. ^[6]; ^[1]; Said, A. H. ^[8]; Bosak, A. ^[1]; ^[7]; ^[9]; ^[10]

European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Donostia International Physics Center (DIPC), San Sebastian (Spain)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; University of Chinese Academy of Sciences, Beijing (China)
Princeton Univ., NJ (United States)
Donostia International Physics Center (DIPC), San Sebastian (Spain); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Donostia International Physics Center (DIPC), San Sebastian (Spain); Princeton Univ., NJ (United States); Basque Foundation for Science, Bilbao (Spain). IKERBASQUE
Donostia International Physics Center (DIPC), San Sebastian (Spain); Basque Foundation for Science, Bilbao (Spain). IKERBASQUE

Geometrically frustrated kagome lattices are raising as novel platforms to engineer correlated topological electron flat bands that are prominent to electronic instabilities. Here, we demonstrate a phonon softening at the k_z = π plane in ScV₆Sn₆. The low energy longitudinal phonon collapses at ~98 K and q = $$\tfrac{1}{3}$$ $$\tfrac{1}{3}$$ $$\tfrac{1}{2}$$ due to the electron-phonon interaction, without the emergence of long-range charge order which sets in at a different propagation vector q_CDW = $$\tfrac{1}{3}$$ $$\tfrac{1}{3}$$ $$\tfrac{1}{3}$$. Theoretical calculations corroborate the experimental finding to indicate that the leading instability is located at $$\tfrac{1}{3}$$ $$\tfrac{1}{3}$$ $$\tfrac{1}{2}$$ of a rather flat mode. We relate the phonon renormalization to the orbital-resolved susceptibility of the trigonal Sn atoms and explain the approximately flat phonon dispersion. Our data report the first example of the collapse of a kagome bosonic mode and promote the 166 compounds of kagomes as primary candidates to explore correlated flat phonon-topological flat electron physics.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; SC0012704

OSTI ID:: 2204335

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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