Reproducible nucleation sites for flux dendrites in MgB2 |
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| Authors: | T.H. Johansen D.V. Shantsev M. Roussel S.X. Dou |
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| Affiliation: | a Department of Physics, University of Oslo, P.O. Box 1048, Blindern, N-0316 Oslo, Norway
b Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, Australia |
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| Abstract: | Magneto-optical imaging was used to study dendritic flux penetration in films of MgB2. By repeating experiments under the same external conditions, reproducible features were seen in the pattern formation; dendrites tend to nucleate from fixed locations along the edge. However, their detailed structure deeper inside the film is never reproduced. The reproducibility in nucleation sites is explained as a result of edge roughness causing field hot spots. |
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| Keywords: | Superconductor Magnetic flux Dendrites Nucleation sites |
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