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Dynamics and resilience of the unconventional charge density wave in ScV6Sn6 bilayer kagome metal

Journal Article · · Communications Materials
 [1];  [2];  [1];  [3];  [2];  [4];  [5];  [6];  [7];  [5];  [3];  [8];  [9];  [10];  [10];  [5];  [5];  [4];  [2];  [11] more »;  [2];  [5];  [6];  [12];  [13] « less
  1. Università degli studi di Trieste (Italy)
  2. Universität Würzburg (Germany)
  3. University of St Andrews (United Kingdom)
  4. University of California Santa Barbara, CA (United States)
  5. Consiglio Nazionale delle Ricerche, Trieste (Italy)
  6. Elettra - Sincrotrone Trieste S.C.p.A (Italy)
  7. Università degli studi di Trieste (Italy); Elettra - Sincrotrone Trieste S.C.p.A (Italy)
  8. University of Oslo (UiO) (Norway)
  9. Boston College, Chestnut Hill, MA (United States)
  10. Consiglio Nazionale delle Ricerche, Trieste (Italy); Università degli Studi di Milano (Italy)
  11. University of Hamburg (Germany); The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee (Germany)
  12. University of Bologna (Italy); Flatiron Institute, New York, NY (United States)
  13. Consiglio Nazionale delle Ricerche, Trieste (Italy); Ca’ Foscari University of Venice (Italy)
Long-range electronic ordering descending from a metallic parent state constitutes a rich playground to study the interplay of structural and electronic degrees of freedom. In this framework, kagome metals are in the most interesting regime where both phonon and electronically mediated couplings are significant. Several of these systems undergo a charge density wave transition. However, to date, the origin and the main driving force behind this charge order is elusive. Here, we use the kagome metal ScV6Sn6 as a platform to investigate this problem, since it features both a kagome-derived nested Fermi surface and van-Hove singularities near the Fermi level, and a charge-ordered phase that strongly affects its physical properties. By combining time-resolved reflectivity, first principles calculations and photo-emission experiments, we identify the structural degrees of freedom to play a fundamental role in the stabilization of charge order, indicating that ScV6Sn6 features an instance of charge order predominantly originating from phonons.
Research Organization:
Boston College, Chestnut Hill, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0020130
OSTI ID:
2481103
Journal Information:
Communications Materials, Journal Name: Communications Materials Journal Issue: 1 Vol. 4; ISSN 2662-4443
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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