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

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dc.creatorAlbrecht, J.
dc.creatorMatveev, A. T.
dc.creatorStrempfer, J.
dc.creatorHabermeier, H. -U.
dc.creatorShantsev, D. V.
dc.creatorGalperin, Y. M.
dc.creatorJohansen, T. H.
dc.date2006-07-03
dc.date.accessioned2026-07-07T07:51:48Z
dc.date.available2026-07-07T07:51:48Z
dc.descriptionAnisotropic 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.
dc.description4 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0607063
dc.identifierhttp://arxiv.org/abs/cond-mat/0607063
dc.identifierPhys. Rev. Lett. 98, 117001 (2007)
dc.identifierdoi:10.1103/PhysRevLett.98.117001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/125647
dc.subjectSuperconductivity
dc.titleDramatic role of critical current anisotropy on flux avalanches in MgB2 films
dc.typetext

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