Abstract
The interaction of sound waves with vortices in type-II superconductors is a field of active study: The attenuation of transverse sound waves through a vortex lattice has been analyzed experimentally in Ref. 1; the generation of ultrasonic waves in the mixed state was observed experimentally; 2 sound attenuation by helicon-vortex modes was considered in Ref. 3; sound-vortex interaction and the acoustic Faraday effect has been studied in Ref. 4; the generation of sound waves by moving vortices was considered theoretically. 5 Since vortex motion is driven by an electric current, any peculiarity of the vortex radiation friction due to emission of acoustic waves influences the current-voltage characteristic, and will imprint a nonlinear feature on the I-V
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