Magnetofingerprints of superconducting films: Vortex dynamics and mesoscopic-scale disorder
Edmund R. Nowak, N. E. Israeloff, A. M. Goldman
DOI 10.1103/PhysRevB.49.10047 · Physical Review B
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Abstract
The variations of voltage and voltage noise with magnetic field in c-axis-oriented DyBa2Cu3O7−δ thin films exhibit reproducible, microstructure-dependent ‘‘magnetofingerprints’’ (MF’s). The MF’s can be scrambled with the reversal of the direction of the Lorentz force on field-induced vortices. Analysis of the noise suggests a strong dependence of the local free-energy landscape on vortex density similar to global frustration effects found in periodic superconducting networks. Above fields which roughly match vortex separation with mesoscopic-scale disorder in the films the noise and the fine structure of the MF’s are suppressed, suggesting a crossover to a more weakly pinned vortex-liquid regime.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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