Abstract
AbstractCurrent oscillations are observed in various piezoelectric semiconductors when an electric field, applied in a piezoelectrically active direction, exceeds a certain critical value. The threshold field and the current minimum are decreased by a transverse magnetic field which increases the piezoelectric amplification. This phenomenon is studied theoretically using Spector's model for all values of the magnetic field. There is good agreement between theory and experiment for materials with a low value of σ τ (σ is the conductivity and τ the relaxation time of carriers) but only qualitative agreement for materials with a high value of σ τ because of the classical limit of the theory.
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