Abstract
The Hall mobility of electrons in high-purity germanium was studied over a range from 7 to 200 \ifmmode^\circ\else\textdegree\fi{}K in a series of samples both before and after irradiation with $^{60}\mathrm{Co}$ $\ensuremath{\gamma}$ rays. In several unirradiated samples the mobility was limited mainly by lattice scattering down to 7 \ifmmode^\circ\else\textdegree\fi{}K. The mobility at 35 \ifmmode^\circ\else\textdegree\fi{}K decreased with radiation dose for all samples, but the magnitude of the decrease was greater in samples having lower carrier concentrations ${n}_{e}$. This decrease was well correlated with ${n}_{e}$. Measured mobilities at 35 \ifmmode^\circ\else\textdegree\fi{}K were significantly lower than values calculated from the Brooks-Herring impurity-scattering expression for ${n}_{e}<{10}^{12}$ ${\mathrm{cm}}^{\ensuremath{-}3}$. At ${n}_{e}={10}^{11}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ the measured mobility was 0.01 times the calculated mobility. No satisfactory explanation has been found.
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