Hole-drift velocity in natural diamond

The drift velocity of holes in natural diamond is analyzed for a wide range of temperatures $85\ensuremath{\le}T\ensuremath{\le}700$ K and fields ${10}^{2}lEl6\ifmmode\times\else\texttimes\fi{}{10}^{4}$ V/cm applied parallel to $〈100〉$ and $〈110〉$ crystallographic directions. Experiments are carried out with the time-of-flight technique, and theory uses a Monte Carlo method. The microscopic interpretation is based on a two-spherical and parabolic band model and considers lattice scattering only. Values ${m}_{h}=1.1{m}_{o}$ and ${m}_{l}=0.3{m}_{o}$ for heavy-and light-hole effective masses are found.