Fluctuation Conductivity in the Incommensurate Peierls System

Abstract

The period of the Peierls distortion in a one-dimensional system is assumed to be incommensurate with the lattice. The fluctuation conductivity just above the mean-field transition temperature is calculated in the presence of electron-impurity scatterings. In the clean limit for sufficiently strong electron-phonon interaction, the conductivity is enhanced by fluctuations whose contribution is impurity limited and goes like ${(T-T_{\mathrm{P}})}^{-\frac{1}{2}}$ in the leading approximation. In the dirty limit, the conductivity is reduced by fluctuations.