Response of fractal penetration of magnetic flux to disorder landscape in superconducting films
Zuxin Ye, Qiang Li, W. D. Si, M. Suenaga, V. F. Solovyov, P. D. Johnson
DOI 10.1103/PhysRevB.72.134514 · Physical Review B
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Abstract
Magnetic flux front and induction contours in superconducting YBa2Cu3O7−δ films with defect size s∼ξ (superconducting coherence length) and s⪢ξ are studied by magneto-optical imaging. Robust self-affine spatial correlation was observed using scaling analysis in the small pinning disorder-dominated (s∼ξ) films. The roughness exponent α was determined to be ∼0.66, independent of numbers of defects (or the film thickness). When the disorder landscape also included a distribution of large defects (s⪢ξ), the flux front and induction contours exhibited self-similarity, with a fractal dimension D determined to be ∼1.33 using the box-counting method. The remarkably different flux penetration patterns were shown to be the manifestation of self-organized criticality at different length scales.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | onset |
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