Abstract

Using a magneto-optic technique we have investigated the magnetic flux propagation into and out of superconducting thin YBa 2Cu 3O 7− δ films. After field cooling below T c, the external magnetic field B ext perpendicular to the film is changed which gives rise to shielding currents in the sample. The current distribution is disturbed momentarily by heating with a focused laser pulse near the sample edge. This triggers a magnetic instability, in which a magnetic flux avalanche starts to propagate.

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