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The temperature (T), frequency (f), and electric field (E) dependent conductivity (σ) of iodine-doped polyacetylene is reported for the concentration regime which encompasses the metal-insulator transition. No f dependence was observed for $f<500$ MHz. The resistance varied logarithmically with E, while σ~lnT and σ~exp[-(TAT)0.25] were observed. This σ(T,E,f) is inconsistent with simple models of metallic regions separated by large barriers and suggests that the known strong disorder plays a dominant role.
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Epstein et al. (1980) studied this question.
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