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.
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