Reproducible nucleation sites for flux dendrites in MgB 2

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Surface Science, ISSN: 0039-6028, Vol: 601, Issue: 24, Page: 5712-5714

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Johansen, T. H.; Shantsev, D. V.; Olsen, A.A.F; Roussel, M.; Pan, A. V.; Dou, S. X.
Elsevier BV
Physics and Astronomy; Materials Science; Reproducible; Nucleation; Sites; for; Flux; Dendrites; MgB2; Engineering
article description
Magneto-optical imaging was used to study dendritic flux penetration in films of MgB 2. 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.