The electrical resistivity of conducting PF6-doped polypyrroles exhibiting resistance maximum near 15 K was measured down to 1 mK. The thermoelectric power was almost proportional to temperature, while ESR measurements exhibited temperature-independent paramagnetic spin concentration of the order of 1.1. × 1021 per mole of pyrrole rings. We propose a conduction model in relation to the spin concentration. The resistance maximum may be ascribed to crossover from hopping conduction to coherent motion. The logarithmic temperature dependence below 1 K is ascribed to scattering of conduction carriers by centers with internal degrees of freedom as in amorphous metal alloys. © 1993.
CITATION STYLE
Kaneko, H., Ishiguro, T., Sato, K., Hagiwara, T., Yamaura, M., Nishiyama, H., & Ishimoto, H. (1993). Metallic states of PF6-doped polypyrroles at low temperature. Synthetic Metals, 55(2–3), 1102–1107. https://doi.org/10.1016/0379-6779(93)90207-D
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