Pk. Kahol et al., ELECTRON LOCALIZATION EFFECTS ON THE CONDUCTING STATE IN POLYANILINE, Journal of physics. Condensed matter, 6(29), 1994, pp. 5631-5638
Electron localization effects in polyaniline have been investigated th
rough the dependence of DC conductivity and magnetic susceptibility on
thermal aging. A dramatic effect of thermal aging on conductivity is
reported in the insulator-to-metal transition region, which is interpr
eted as due to the onset of structural order between the chains. This
is argued to confirm that the insulator-to-metal transition correspond
s to a crossover of the electron states from localization to delocaliz
ation. Furthermore, the quasi-one-dimensional variable-range hopping m
odel is shown to account for the observed temperature dependences of t
he conductivity in the entire protonation range.