Effect of Impurity Scattering on the Magnetoresistance ofn-Type Germanium

Abstract

Observations in $n$-type germanium show a decrease in the anisotropy of the magnetoresistance with increased ionized-impurity content and with decreased temperature. Although similar to what is expected due to ionized-impurity scattering, the details of the variation do not agree with calculations assuming anisotropic impurity scattering. Deviations from the magnetoresistance symmetry conditions are observed for crystals with electron concentration $n>\mathrm{}4\mathrm{}\times {10}^{15}$ ${\mathrm{cm}}^{-3\mathrm{}}$ at 77°K.