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Softening of a flat phonon mode in the kagome ScV6Sn6.
Korshunov, A; Hu, H; Subires, D; Jiang, Y; Calugaru, 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.
Afiliação
  • Korshunov A; European Synchrotron Radiation Facility (ESRF), BP 220, F-38043, Grenoble, France.
  • Hu H; Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal, 20018, San Sebastián, Spain.
  • Subires D; Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal, 20018, San Sebastián, Spain.
  • Jiang Y; Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
  • Calugaru D; University of Chinese Academy of Sciences, Beijing, 100049, China.
  • Feng X; Department of Physics, Princeton University, Princeton, NJ, 08544, USA.
  • Rajapitamahuni A; Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal, 20018, San Sebastián, Spain.
  • Yi C; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
  • Roychowdhury S; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA.
  • Vergniory MG; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
  • Strempfer J; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
  • Shekhar C; Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal, 20018, San Sebastián, Spain.
  • Vescovo E; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
  • Chernyshov D; Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA.
  • Said AH; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
  • Bosak A; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA.
  • Felser C; Swiss-Norwegian BeamLines at European Synchrotron Radiation Facility, Grenoble, France.
  • Bernevig BA; Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA.
  • Blanco-Canosa S; European Synchrotron Radiation Facility (ESRF), BP 220, F-38043, Grenoble, France.
Nat Commun ; 14(1): 6646, 2023 Oct 20.
Article em En | MEDLINE | ID: mdl-37863907
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 = [Formula: see text] due to the electron-phonon interaction, without the emergence of long-range charge order which sets in at a different propagation vector qCDW = [Formula: see text]. Theoretical calculations corroborate the experimental finding to indicate that the leading instability is located at [Formula: see text] 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.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article