Acoustoelectric Effect and Intervalley Scattering Rates in Antimony-Doped Germanium

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Abstract
The acoustoelectric effect in antimony-doped germanium has been measured as a function of temperature and doping by a method similar to that used by Weinreich, Sanders, and White for arsenic-doped germanium. The purpose of this experiment was to determine from the acoustoelectric effect the intervalley scattering rates for ionized and neutral antimony donors. Models for the scattering process are discussed, and the antimony rates are compared with those for arsenic. Our main result is that the rate per ionized antimony donor varies by a factor of 50 from 15 to 100°K, following approximately an inverse-square temperature dependence. The rate per ionized donor is a factor of 2 smaller than for arsenic at 20°K, and a factor of 10 smaller at 100°K.

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