Measurement ofn-type Germanium Microwave Conductivity During Impact Ionization of Impurities at 4.2°K

Abstract

We have measured the microwave conductivity of $n$-type germanium with $N_D-N_A\sim {10}^{14}$ ${\mathrm{cm}}^{-3\mathrm{}}$ during impact ionization at 4.2°K, by means of a cavity perturbation method which requires no knowledge of the electronic spatial distribution. Values of the electronic temperature derived from the microwave conductivity are compared with theoretical predictions and Hall mobility data at higher temperatures.