Abstract
Magnetic field dependence of resistivity ρ and Hall coefficient R H of antimony-doped germanium samples containing between 2×10 16 and 1×10 17 cm -3 excess donors have been measured below 4.2°K. These samples belong to the hopping or the intermediate region of the impurity conduction and the temperature dependence of ρ obeys an exponential law ρ ∞ exp ( ε / k T ). The main effect of the magnetic field is an increase of pre-exponential factor ρ ∞ for the hopping samples while it is an increase of activation energy ε for the intermediate ones. The increase of ε is proportional to H 2 and the proportionality coefficient depends on donor concentration, compensation ratio and it also depends slightly on temperature. A model which can qualitatively explain these features of intermediate impurity conduction is proposed.
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