Low-frequency current oscillations observed with high-resistivity nonohmic GaAs devices

Low-frequency small-amplitude current oscillations have been observed with devices constructed of high-resistivity n type bulk GaAs. The oscillations occurred simultaneously with current saturation with low threshold fields (200¿1000 V/cm). The contact junctions made to the oscillating devices appear to be decidedly nonohmic, contrary to what other researchers observing the same type of oscillations have reported for their devices.