Noise probes of underlying static correlation lengths in the superconducting peak effect
M. W. Rabin, R. D. Merithew, M. B. Weissman, M. J. Higgins, S. Bhattacharya
DOI 10.1103/PhysRevB.57.R720 · Physical Review B
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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 NbSe2. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | unknown |
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