Response of fractal penetration of magnetic flux to disorder landscape in superconducting films

Details Response of fractal penetration of magnetic flux to disorder landscape in superconducting films Response of fractal penetration of magnetic flux to disorder landscape in superconducting films

2005-08-20

arxiv.org/abs/cond-mat/0508486v1

Physics

Condensed Matter

Superconductivity

20 pages, 4 figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.72.134514

Magnetic flux front and induction contours in superconducting YBa2Cu3O7-d films with defect size s ~ l (superconducting coherence length) and s > l are studied by magneto-optical imaging. Robust self-affine spatial correlation was observed using scaling analysis in the small pinning-dominated (s ~ l) disorderd films. The roughness exponent 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 >> l), the flux front and induction contours exhibited self-similarity, with a fractal dimension 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.

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