Ilakovac, VitaGirard, AdrienBaledent, VictorFoury-Leylekian, PascaleWinkler, BjoernBerger, HelmuthBosak, AlexeiPouget, Jean-PaulKupcic, Ivan2021-03-262021-03-262021-03-262021-01-1410.1103/PhysRevB.103.014306https://infoscience.epfl.ch/handle/20.500.14299/176807WOS:000607490600002Lattice dynamics of low-dimensional BaVS3 is reported across the metal-insulator Peierls transition occurring at T-P = 69 K using a combination of the thermal diffuse scattering of x rays, inelastic x-ray scattering, and density-functional theory calculations. The nondetection of a Kohn anomaly points to a unique situation of an order-disorder Peierls instability with a quasielastic critical scattering which has been fully characterized. These observations are discussed in the scope of a Peierls instability dominated by strong electron-phonon coupling and/or nonadiabatic effects.Materials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterMaterials SciencePhysicscharge-density-waveelectronic-structureneutron-scatteringliquid behavior1st principlesfermi-surfacetransitionsdynamicsphasestatetext::journal::journal article::research article