Relaxation Time Anisotropy inn-Type Germanium

Abstract

The anisotropy parameter $K=\frac{K_m}{K_{\tau }}=\left(\frac{m_{\parallel }}{m_{\perp }}\right){\left(\frac{{\tau }_{\parallel }}{{\tau }_{\perp }}\right)}^{-1\mathrm{}}$ is determined from magnetoconductance measurements in the temperature range 45°K to 300°K. If one uses the cyclotron resonance value for the mass ratio $K_m$, the magnetoconductance measurements give $K_{\tau }=1.0\mathrm{}$ for lattice scattering and $K_{\tau }>1\mathrm{}$ for moderate amounts of impurity scattering. For strong impurity scattering, the data show that the scattering cannot be represented by a simple relaxation-time tensor model.