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- W2054849525 abstract "The frequency (f) and temperature (T) dependence of the complex conductivity ${mathrm{ensuremath{sigma}}}^{mathrm{*}}$ was measured for undoped and lightly doped films of highly stretchable polyacetylene (hs-PA) and Shirakawa polyacetylene (S-PA). When ${mathrm{ensuremath{sigma}}}^{mathrm{*}}$ and f were reduced by using the dc conductivity ensuremath{sigma}(0), all the experimental data of ${mathrm{ensuremath{sigma}}}^{mathrm{*}}$ of hs-PA were on a master curve whereas those of S-PA did not show such universality. The data analysis based on the conductivity relaxation formalism revealed that the functional form H(ensuremath{tau})ensuremath{propto}${mathrm{ensuremath{tau}}}^{mathrm{ensuremath{alpha}}}$ (${mathrm{ensuremath{tau}}}_{mathrm{min}}$${mathrm{ensuremath{tau}}}_{mathrm{max}}$, -11) of the relaxation spectrum H(ensuremath{tau}), i.e., the distribution function of relaxation time ensuremath{tau}, fitted the experimental data best and that ensuremath{alpha} was independent of T for hs-PA while ensuremath{alpha} was proportional to T for S-PA. The T-independent ensuremath{alpha} for hs-PA indicates isoenergetic hopping between equivalent sites, so that the conduction mechanism in hs-PA can be ascribed to acoustic-phonon-assisted hopping of charged solitons between PA chains. On the other hand, it is likely that the inter-fibril-barrier hopping makes the main contribution to the conduction mechanism in S-PA. This difference in conduction mechanisms between hs-PA and S-PA is attributed to their morphological dissimilarities." @default.
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- W2054849525 date "1992-01-15" @default.
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- W2054849525 title "Complex conductivity of polyacetylene films prepared by different methods" @default.
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- W2054849525 doi "https://doi.org/10.1103/physrevb.45.1246" @default.
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