Dendritic instability in YBa2Cu3O7-δ films triggered by transient magnetic fields

M. Baziljevich, E. Baruch-El, T. H. Johansen, Y. Yeshurun

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43 Scopus citations


Superconducting films of YBa2Cu3O7-δ are shown to become thermomagnetically unstable when experiencing a time-varying perpendicular magnetic field. Using magneto-optical imaging and ramping the applied field at rates up to 3000 T/s, dendritic flux avalanches were observed in two different films, one grown by evaporation on sapphire and one by laser ablation on SrTiO3. The unstable behavior occurs over a wide temperature range limited by an upper threshold value of 40 K for the film on sapphire, and 20 K for the one on SrTiO3. At 7 K for the same films, the threshold ramping rates are 1000 T/s and 3000 T/s, respectively. The avalanches are causing permanent damage by leaving a micron wide track where the superconductor melted during the thermomagnetic runaway.

Original languageEnglish
Article number012602
Number of pages5
JournalApplied Physics Letters
Issue number1
StatePublished - 7 Jul 2014

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