Abstract
Microwave responses of intrinsic Josephson junction stacks in the flux-flow state have been studiedto explore phase-locked vortex motion. Remarkable step and zero-crossing structures are induced inthe I–V characteristics by microwave irradiations. It is shown that vortex motion phase-locked toexternal microwaves plays an important role in the responses. Numerical simulations revealthat the alternating magnetic field of microwaves drives vortices into the stack andgenerates the zero-crossing step.
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