Hopping Electron Transport in Doped Polyaniline: an Experimental   Verification of the Fogler-Teber-Shklovskii Model
  We present a study of the temperature (T) dependence of the dc electrical conductivity of polyaniline pellets doped over a wide range. A crossover between low-T variable-range hopping and high-T nearest-neighbor hopping has been found below room temperature for most of the samples, which is atypical for conducting polymers. This allows us to construct an experimental diagram that accounts for different regimes in the hopping electron transport and closely resembles predictions of the Fogler-Teber-Shklovskii model in three dimensions. 
Mirko Ba\'cani, Mario Novak, Ivan Kokanovi\'c, Dinko Babi\'c
cond-mat.str-el cond-mat.dis-nn cond-mat.mtrl-sci