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VOLUME 41 (1985) | ISSUE 6 | PAGE 231
Hopping conductivity of germanium bicrystals in strong electric fields at T < 1 K
The electrical conductivity σΏ of germanium bicrystals with a tilt angle θ~ 8.5° is studied as a function of the strength of the electric field Ε in the region near the hopping conductivity over the temperature range 0.05 <Γ< 1 К. As the electric field is increased, the region σ(Ε) ~ const gives way to an interval of fields, in which tr~ exp γΕ and the coefficient γ increases with decreasing T. At the lowest temperatures, Г<0Л К, the functional dependence/—exp [ — {Ες/Ε)1Ι2\ is found to be consistent with the theoretical prediction of Efros and Shklovskii.