Avalanche-driven fractal flux distributions in NbN superconducting films

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Flux distributions in thin superconducting NbN films placed in a perpendicular magnetic field have been studied using magneto-optical imaging. Below 5.5 K the flux penetrates in the form of abrupt avalanches resulting in dendritic structures. Magnetization curves in this regime exhibit extremely noisy behavior. Stability is restored both above a threshold temperature T* and applied field H*, where H* is smaller for increasing field than during descent. The dendrite size and morphology are strongly T dependent, and fractal analysis of the first dendrites entering into a virgin film shows that dendrites formed at higher T have larger fractal dimension.
3 pages, 5 figures

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/25314

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0411489
 http://arxiv.org/abs/cond-mat/0411489
 Appl. Phys. Lett. 87, 042502 (2005)
 doi:10.1063/1.1992673

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arXiv