Conductivity, Superconductivity, and the Peierls Instability

Abstract
We investigate the properties of a one-dimensional model of the electron-phonon system which exhibits the Peierls instability. The instability tends to suppress BCS pairing, and the resulting Peierls state below the structural transformation is semiconducting. Results of the conductivity calculation compare favorably with recent measurements on most samples of tetrathiofulvalinium tetracyanoquinodimethane but cannot explain the extraordinary conductivity peaks found in a few samples.