Voltage noise generated by the driven vortices in and just below the peak-effect regime of a thick amorphous MoxGe1-x film is presented, focusing on a change in broadband noise as the system undergoes the mode-locking (ML) resonance. ML occurs when the ac drive superimposed on the dc drive excites the lattice-oscillation modes collectively. Except for the field near the melting field, the noise spectrum is frequency (f)-independent at high f. We find that for all the fields studied the magnitude of noise at high f decreases in the ML resonance.
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