Theory of Sound Wave and Phason in a Quasi-One-Dimensional Incommensurate CDW System. II. Acoustic Anomalies at Tc

摘要: Anomalies of the sound velocity and ultrasonic attenuation coefficient at an incommensurate CDW transition temperature ( T c ) are investigated in a quasi-one-dimensional system. A scaling relation between anomaly above that below is established. The dependence shows cross-over from one to three dimensions according change dimensionality critical fluctuations. accoustic anomalies shown be enhanced by breaking charge conjugation symmetry resulting nonlinearity electron dispersion. As result, dip which diverges as f 3/2 (τ) for τ≫τ 1 (τ/τ \(\tau{\lesssim}\tau_{1}\) where τ=|( - )/ |, n (τ)=τ τ non-dimensional temperature. 5/2 \(\tau{\lesssim}\tau_{1}\). For both anomalies, ...