The DC magnetoresistivity measurements of a compensated and barely insulating indium phosphide sample yield results showing variable-range hopping (VRH) in the temperature range 0.09 K 6T) s=0.5. This suggests that, in the vicinity of the metal-insulator transition, the VRH is in agreement with Mott's predictions (1968) assuming a constant density of states N(E F ) at the Fermi level whereas, far from the metal-insulator transition, a Coulomb gap is opening, in agreement with the predictions of Shklovskii and Efros (1984).
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Biskupski et al. (1988) studied this question.
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