Abstract
Abstract We report on an extensive study of the frequency and temperature dependent conductivity of largely cis- (CH)x trans- (CH)x, and NH3 compensated and iodine doped materials. The results reveal a strongly temperature (T) dependent dc conductivity and weakly T-dependent ac conductivity for largely cis- (CH)x and for NH3 compensated samples, similar to the behavior that is observed in many crystalline and amorphous semiconductors. The trans- (CH)x and lightly iodine doped trans- (CH)x have larger dc and ac conductivity and a strongly T-dependent ac conductivity. These latter results contrast with the usual expectations of variable range hopping and polaronic hopping, but are in good agreement with the predictions of Kivelson's Theory of charge transport via intersoliton electron hopping.
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