Highly conducting polyacetylene: Three-dimensional delocalization

Abstract

We report the experimental results for magnetic susceptibility, thermopower, and magnetoresistance of highly conducting ${\mathrm{I}}_2$-doped new polyacetylene, N-(CH${)}_{\mathit{x}}$. These measurements deal with the density of states at the Fermi energy, its local structure, and conduction-electron relaxation time. We conclude that microscopic electronic phenomena in the highly doped N-(CH${)}_{\mathit{x}}$ as compared with the earlier studied Shirakawa polyacetylene has not been changed; rather there is an increase in the relaxation time along the chain or interchain transfer that helps to avoid entrapment of the charge within a single chain. This leads to the three-dimensional delocalization of electrons responsible for the high conductivity.