| Autor: |
Cuadra-Solís, P. de Jesús, Hernández, J. M., García-Santiago, A., Tejada, J., Noskovic, J., Pidik, A., Grajcar, M. |
| Předmět: |
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| Zdroj: |
Journal of Superconductivity & Novel Magnetism; Feb2011, Vol. 24 Issue 1/2, p395-400, 6p, 1 Diagram, 5 Graphs |
| Abstrakt: |
We report on avalanche-like flux features in the response of superconducting films of MgB, 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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