Large Kohn anomaly and phonon collapse induced by charge density wave in UPt${}_2$Si${}_2$

Jooseop Lee, Greta L. Chappell, Ryan E. Baumbach +2

Using high-energy-resolution inelastic x-ray scattering, we observe anomalous softening and damping of the transverse acoustic phonon in UPt${}_2$Si${}_2$ as the system is cooled towar…