Abstract
Magnetoresistance data on an insulating indium phosphide sample show variable range hopping (VRH) processes in the temperature range 4.2 > T > 0.09K and magnetic field range B < 11 Tesla. The conductivity is well described by the usual VRH law and its logarithm varies like T −0.25 for B < 6T i.e. near the metal-insulator (MI) transition and like T −0.5 for B > 6T. In the vicinity of the MI transition the VRH is in agreement with Mott predictions while far from the MI transition, a Coulomb gap seems to appear in agreement with Efros and Shklovskii predictions.
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