Longitudinal Anisotropy of the High-Field Conductivity of n -Type Germanium at Room Temperature

New pulse measurements of the high-field conductivity of n-type germanium at room temperature have been performed. Contrary to previous measurements, the conductivity is anisotropic above the Ohmic field range. The highest current for a given field is found along the 100> crystallographic axes; the 110> current is as much as 9% lower, and the 111> current 14% lower than the 100> current. The maximum anisotropy is found at a field of 3 kV/cm. No region of constant drift velocity is found; current increases with field up to 30 kV/cm, the highest field applied.