Dramatic role of critical current anisotropy on flux avalanches in MgB2 films

Details Dramatic role of critical current anisotropy on flux avalanches in MgB2 films Dramatic role of critical current anisotropy on flux avalanches in MgB2 films

2006-07-03

arxiv.org/abs/cond-mat/0607063v1

Phys. Rev. Lett. 98, 117001 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.98.117001

Anisotropic penetration of magnetic flux in MgB2 films grown on vicinal sapphire substrates is investigated using magneto-optical imaging. Regular penetration above 10 K proceeds more easily along the substrate surface steps, anisotropy of the critical current being 6%. At lower temperatures the penetration occurs via abrupt dendritic avalanches that preferentially propagate {\em perpendicular} to the surface steps. This inverse anisotropy in the penetration pattern becomes dramatic very close to 10 K where all flux avalanches propagate in the strongest-pinning direction. The observed behavior is fully explained using a thermomagnetic model of the dendritic instability.

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