Abstract
The sensitivity of low-frequency noise to ac magnetic-field perturbations is explored in the plastic flow regime near the ``peak effect'' in the clean type-II superconductor ${\mathrm{NbSe}}_{2}.$ Very small ac magnetic fields (on the order of 1 Oe in a dc field of about 20 000 Oe) substantially reduce the low-frequency spectral density by inducing rapid switching among metastable configurations present in the pinned state. This sensitivity to ac fields shrinks rapidly as $H$ increases in the peak-effect regime, indicating reduced static correlation lengths as the peak is approached.
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