Onset of dendritic flux avalanches in superconducting films

Details Onset of dendritic flux avalanches in superconducting films Onset of dendritic flux avalanches in superconducting films

2006-05-16

arxiv.org/abs/cond-mat/0605425v1

Phys. Rev. Lett. 97, 077002 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.97.077002

We report a detailed comparison of experimental data and theoretical predictions for the dendritic flux instability, believed to be a generic behavior of type-II superconducting films. It is shown that a thermo-magnetic model published very recently [Phys. Rev. B 73, 014512 (2006)] gives an excellent quantitative description of key features like the instability onset (first dendrite appearance) magnetic field, and how the onset field depends on both temperature and sample size. The measurements were made using magneto-optical imaging on a series of different strip-shaped samples of MgB2. Excellent agreement is also obtained by reanalyzing data previously published for Nb.

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