Ultrasonic Properties of Quasi One-Dimensional (TaSe4)2I at the Peierls Transition
(TaSe4)2I is a quasi-1 D conductor which undergoes a Peierls transition at Tp = 260 K . Phonon softening at 2kF (Fermi momentum) induces lattice modulations associated with an electron charge density wave (CDW). Elastic singularities at the Peierls transition are not yet well understood . The associated singularity in the sound velocity examined theoretically by Nakane  varies like |T-Tp|−1/2 around Tp.
KeywordsSound Velocity Charge Density Wave Ultrasonic Measurement Fermi Momentum Ultrasonic Attenuation
- For a Reveiw see: P. Monceau, in Electrical Properties of Inorganic Quasi-1 D Material, Holland 1985; and G. Grüner and A. Zettl, Phys. Rep. 119, 117 (1985).Google Scholar
- J.E. Lorenzo, R. Currat, P. Monceau et al.,to be published.Google Scholar
- B. Lüthi and W. Rehwald, in Structural Phase Transitions, ed. K.A. Muller and H. Thomas, Vol. 23 (Springer Verlag 1981) p. 131. L.R.Testardi Phys. Rev. B 12,3849 (1975).Google Scholar