Abstract
We report on avalanche-like flux features in the response of superconducting films of MgB2, prepared by magnetron sputtering and an ex-situ annealing process, when a single high-frequency pulse is used as a perturbative source. The instability is observed as an abrupt jump in the output voltage signal of the SQUID magnetometer where the sample is measured as a function of temperature, magnetic field, and pulse width, at fixed nominal power and frequency values. The interaction between the high-frequency surface currents and the relaxing vortex system is suggested to explain the nucleation of avalanches. Local heating due to the pulse application is also considered as a contributing mechanism.
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Cuadra-Solís, P.d.J., Hernández, J.M., García-Santiago, A. et al. Vortex Avalanches Induced by Single High-Frequency Pulses in MgB2 Films. J Supercond Nov Magn 24, 395–400 (2011). https://doi.org/10.1007/s10948-010-0946-y
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DOI: https://doi.org/10.1007/s10948-010-0946-y