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- Title
Order-disorder charge density wave instability in the kagome metal (Cs,Rb)V<sub>3</sub>Sb<sub>5</sub>.
- Authors
Subires, D.; Korshunov, A.; Said, A. H.; Sánchez, L.; Ortiz, Brenden R.; Wilson, Stephen D.; Bosak, A.; Blanco-Canosa, S.
- Abstract
The origin of the charge density wave phases in the kagome metal compound AV3Sb5 is still under great scrutiny. Here, we combine diffuse and inelastic x-ray scattering to identify a 3-dimensional precursor of the charge order at the L point that condenses into a CDW through a first order phase transition. The quasi-elastic critical scattering indicates that the dominant contribution to the diffuse precursor is the elastic central peak without phonon softening. However, the inelastic spectra show a small broadening of the Einstein-type phonon mode on approaching TCDW. Our results point to the situation where the Fermi surface instability at the L point is of order-disorder type with critical growth of quasi-static domains. The experimental data indicate that the CDW consists on an alternating Star of David and trihexagonal distortions and its dynamics goes beyond the classical weak-coupling scenario and is discussed within strong-electron phonon coupling and non-adiabatic models. The mechanism of the charge density wave in kagome metals is under intense debate. Here, by using a combination of diffuse scattering and inelastic x-ray scattering, the authors show that the charge density wave transition in (Cs,Rb)V3Sb5 is of the order-disorder type.
- Subjects
EINSTEIN, Albert, 1879-1955; CHARGE density waves; RUBIDIUM; SCATTERING (Physics); INELASTIC scattering; QUASI-elastic scattering; X-ray scattering; CUPRATES
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-36668-w