Softening of a flat phonon mode in the kagome ScV6Sn6

A. Korshunov, H. Hu, D. Subires, Y. Jiang, D. Călugăru, X. Feng, A. Rajapitamahuni, C. Yi, S. Roychowdhury, M. G. Vergniory, J. Strempfer, C. Shekhar, E. Vescovo, D. Chernyshov, A. H. Said, A. Bosak, C. Felser, B. Andrei Bernevig () and S. Blanco-Canosa ()
Additional contact information
A. Korshunov: European Synchrotron Radiation Facility (ESRF)
H. Hu: Paseo Manuel de Lardizábal
D. Subires: Paseo Manuel de Lardizábal
Y. Jiang: Chinese Academy of Sciences
D. Călugăru: Princeton University
X. Feng: Paseo Manuel de Lardizábal
A. Rajapitamahuni: Brookhaven National Laboratory
C. Yi: Max Planck Institute for Chemical Physics of Solids
S. Roychowdhury: Max Planck Institute for Chemical Physics of Solids
M. G. Vergniory: Paseo Manuel de Lardizábal
J. Strempfer: Argonne National Laboratory
C. Shekhar: Max Planck Institute for Chemical Physics of Solids
E. Vescovo: Brookhaven National Laboratory
D. Chernyshov: Swiss-Norwegian BeamLines at European Synchrotron Radiation Facility
A. H. Said: Argonne National Laboratory
A. Bosak: European Synchrotron Radiation Facility (ESRF)
C. Felser: Max Planck Institute for Chemical Physics of Solids
B. Andrei Bernevig: Paseo Manuel de Lardizábal
S. Blanco-Canosa: Paseo Manuel de Lardizábal

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract 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 kz = π plane in ScV6Sn6. The low energy longitudinal phonon collapses at ~98 K and q = $$\frac{1}{3}\frac{1}{3}\frac{1}{2}$$ 1 3 1 3 1 2 due to the electron-phonon interaction, without the emergence of long-range charge order which sets in at a different propagation vector qCDW = $$\frac{1}{3}\frac{1}{3}\frac{1}{3}$$ 1 3 1 3 1 3 . Theoretical calculations corroborate the experimental finding to indicate that the leading instability is located at $$\frac{1}{3}\frac{1}{3}\frac{1}{2}$$ 1 3 1 3 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.

Date: 2023
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DOI: 10.1038/s41467-023-42186-6

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