Abstract
The electrical conductivity of a iodine-doped polyacetylene is measured as a function of the electric field ℰ at temperatures between 4K and 0.3K. We find that after an initial non-linear behavior σ increases linearly with ℰ in agreement with a theoretical description based on variable-range hopping conduction. The non-linear rise at low fields depends on the iodine concentration. In heavily doped samples the increase is small and varies as ℰ2, whereas in less conductive samples a large change is observed at 0.3K which varies approximately as log ℰ for fields from 1 V/m to 150 V/m.
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Dedicated to K. Dransfeld on the occasion of his 60th birthday
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Chaabane, H., Ettlinger, E. & Schoepe, W. Non-ohmic conduction in doped polyacetylene at low temperatures. Z. Physik B - Condensed Matter 64, 19–23 (1986). https://doi.org/10.1007/BF01313684
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DOI: https://doi.org/10.1007/BF01313684