Variable-range hopping and Coulomb gap in indium phosphide
- 20 January 1988
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 21 (2) , 333-338
- https://doi.org/10.1088/0022-3719/21/2/017
Abstract
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 K0 exp(-(T0/T)3) indicates that s=0.25 for B6T) 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(EF) 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).Keywords
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