2007/05/07 by Åge Andreas Falnes Olsen, T. H. Johansen, Olsen, Age Andreas Falnes +12
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys
paper · pdf · doi:10.48550/arxiv.0705.0997
openalex publication_date 2007/05/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Magneto-optical imaging was used to observe dendritic flux avalanches\nconnecting the outer and inner edges of a ring-shaped superconducting MgB2\nfilm. Such avalanches create heated channels across the entire width of the\nring, and inject large amounts of flux into the central hole. By measuring the\ninjected flux and the corresponding reduction of current, which is typically\n15%, we estimate the maximum temperature in the channel to be 100 K, and the\nduration of the process to be on the order of a microsecond. Flux creep\nsimulations reproduce all the observed features in the current density before\nand after injection events.\n