BISTABLE MAGNETIC-RESONANCE OF CONDUCTION ELECTRONS IN INP

The magnetic resonance of conduction electrons in InP exhibits a prono unced hysteresis with distorted line shapes. These features are quanti tatively accounted for by considering the intrinsically bistable chara cter of the dynamic nuclear polarization due to the Overhauser effect. The gross features of the resonance, its hysteresis. and the line sha pes are controlled by the steady-state bistable nuclear held. It is sh own that the effect of the long nuclear-relaxation time is compensated by the effects of the nuclear-field fluctuations, The respective cont ributions of the intrinsic bistability the nuclear-relaxation rate, an d the fluctuations an clearly identified by considering the bistable r esonance as the overdamped motion of the spin system in a bistable pot ential.