Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Postersitzung I: Supraleitung

TT 8.30: Poster

Montag, 8. März 2004, 14:30–19:00, Poster A

Ultra fast magneto-optics on BSCCO single crystals — •Björn Biehler, Bernd-Uwe Runge, and Paul Leiderer — Universität Konstanz, Universitätsstr. 10, 78457 Konstanz, Germany

We used the Faraday effect together with ultra short laser pulses to investigate the dynamics in superconductors down to the nanosecond regime. The lateral resolution is better than 10 µm. Using this technique we investigated flux penetration into various materials upon sudden heating with a fs-laser pulse.

Under certain conditions thin superconducting films show a dendritic instability when heated locally by a laser pulse [1]. Since BSCCO single crystals have less pinning centers than typical thin films we chose this material to compare its behaviour with different thin film systems (YBCO, MgB₂). Systematic variation of the experimental parameters did not lead to dendrite nucleation, which makes it a unique system not showing this instability.

[1] U. Bolz, B. Biehler, D. Schmidt, B.-U. Runge, P. Leiderer, Europhys. Lett. 64(4) 517 (2003)