ONE-DIMENSIONAL LOCALIZATION EFFECTS IN 3-DIMENSIONAL STRUCTURES OF HIGHLY-CONDUCTING POLYMERS

Starting with a model of weakly overlapping metallic chains we develop ed a transport theory for degenerate electrons in an irregular structu re of fibril-form polymers. The anisotropy of intrafibril kinetic char acteristics is enhanced by highly anisotropic scattering by dopants. T herefore, in spite of the weak backward impurity scattering, the 1d lo calization effects can be profound on an intrinsic level. The kinetic state of the 3d polymer structure is determined by the interfibril ele ctron transfer-rate and the density of cross-links. The role of phonon s consists mainly in breaking of localization at higher temperatures. In the dielectric phase at low temperatures the transport is provided by phonon-assisted hopping. The interplay between weak interfibril hop ping and fast intrafibril incoherent diffusion leads to the specific t emperature dependence for the conductivity and the dielectric properti es. These results describe very well the experimental dependencies for dc- conductivity and mw-dielectric constant in heavily doped polyacet ylene and polyaniline.