Thermal Conductivity ofp-Ge down to 50 mK

Thermal conductivity measurements on samples of $p$-Ge down to 50 mK indicate the presence of an approximately Gaussian distribution of resonant scattering frequencies which has a width $\Delta \sim 30$ GHz. The data suggest that this is due to about half of the acceptors which are in distorted sites while the other half are relatively free from distortion. The "two-site" model reconciles disagreements in linewidth from different types of experiment. We obtain a value for ${D_{u^{\prime }}}^a\left(\mathrm{dynamic}\right)=4.1\mathrm{}\pm 0.4$ eV.