Abstract
The magnetic resonance of conduction electrons in InP exhibits a pronounced hysteresis with distorted line shapes. These features are quantitatively accounted for by considering the intrinsically bistable character of the dynamic nuclear polarization due to the Overhauser effect. The gross features of the resonance, its hysteresis, and the line shapes are controlled by the steady-state bistable nuclear field. It is shown that the effect of the long nuclear-relaxation time is compensated by the effects of the nuclear-field fluctuations. The respective contributions of the intrinsic bistability, the nuclear-relaxation rate, and the fluctuations are clearly identified by considering the bistable resonance as the overdamped motion of the spin system in a bistable potential.
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