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The temperature ( T) dependent dc conductivity ( σDC) (down to 20 mK) and dielectric function at optical frequencies (0.002--6 eV) and 6.5 GHz are used to probe the inhomogeneous disorder-driven insulator-metal transition in conducting polymers. A correlation between large low T σDC and the presence to low T of a small fraction of the carrier density delocalized with long transport times ( >10^-13s) indicates that metallic σDC is due to only a small fraction of the charge carriers. The achievable σDC for these systems when the entire charge carrier density participates is estimated to surpass that of copper.
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Kohlman et al. (1997) studied this question.
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