Transport anomalies in highly doped conjugated polymers at low temperatures
- 1 May 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 59 (17), 11322-11327
- https://doi.org/10.1103/physrevb.59.11322
Abstract
The anomalous low-temperature transport properties of highly doped conjugated polymers are considered. It is concluded that the behavior observed is in particular related to glassy properties of the polymer structure. The two-level system (TLS) model and more general soft potential model are applied to explain behavior of the conductivity at temperatures from several mK up to 50–70 K. The negative temperature resistance coefficient observed at low temperatures is attributed to weak localization which is at higher temperatures suppressed by a strong inelastic scattering of electrons by low-energy vibrational excitations typical for glasses. The semiconducting behavior of the resistance at high temperatures is ascribed to macroscopic disorder. Namely, we assume that the sample contains regions which are insulating at but contribute to the conductivity at elevated temperatures.
Keywords
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