The velocity field characteristics of electrons in germanium were measured in a range of temperatures between 33°K and 130°K and the electric field along the 〈 100 〉 orientation of the crystal. At 33°K a negative differential mobility of 300 cm2/V-sec was observed with a threshold field of 1.5 kV/cm. The negative differential mobility decreases with increasing temperature. At 130°K there is definitely no negative differential mobility.
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Chang et al. (1968) studied this question.
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