Electrical conductivity of perchlorate doped polyacetylene

The electrical conductivity of perchlorate doped polyacetylene was measured down to 1.5 K. The temperature dependence of conductivity was anayzed by Mottʹs three dimesional variable range hopping model. At the high (190-50K) and low (15 K - 1.5 K) temperature regions, the plots of 1n[σ(T)T12] showed linear relations to T−14. For the parallel direction to stretching direction, the hopping distance and decay length of the localized state become larger with an incresing orientational order. The variable range hopping parameters indicate that the anisotropy of the conductivity arises from the hopping frequency factor.