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Controllable morphology of flux avalanches in microstructured superconductors

By M. Motta, F. Colauto, J. I. Vestgarden, Joachim Fritzsche, M. Timmermans, J. Cuppens, C. Attanasio, C. Cirillo, V. V. Moshchalkov, J. V. de Vondel, T. H. Johansen, W. A. Ortiz and A. V. Silhanek

Abstract

The morphology of abrupt bursts of magnetic flux into superconducting films with engineered periodic pinning centers (antidots) has been investigated. Guided flux avalanches of thermomagnetic origin develop a treelike structure, with the main trunk perpendicular to the borders of the sample, while secondary branches follow well-defined directions determined by the geometrical details of the underlying periodic pinning landscape. Strikingly, we demonstrate that in a superconductor with relatively weak random pinning the morphology of such flux avalanches can be fully controlled by proper combinations of lattice symmetry and antidot geometry. Moreover, the resulting flux patterns can be reproduced, to the finest details, by simulations based on a phenomenological thermomagnetic model. In turn, this model can be used to predict such complex structures and to estimate physical variables of more difficult experimental access, such as the local values of temperature and electric field

Topics: Other Engineering and Technologies
Publisher: 'American Physical Society (APS)'
Year: 2014
DOI identifier: 10.1103/PhysRevB.89.134508
OAI identifier: oai:research.chalmers.se:200318
Provided by: Chalmers Research
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