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TT: Tiefe Temperaturen

TT 20: Postersitzung IV (Mesoskopische Systeme, Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen)

TT 20.26: Poster

Donnerstag, 27. März 2003, 14:30–19:00, P2c, P2d

Snapshots of Magnetic Flux Penetration on a Nanosecond Timescale — •Daniel Schmidt, Björn Biehler, Uwe Bolz, Bernd-Uwe Runge, and Paul Leiderer — University of Konstanz; Universitätsstr. 10; 78457 Konstanz

We present latest results on how magnetic flux penetrates into thin superconducting YBCO films along a line heated by a fs-laser. The time resolution in the nanosecond range is obtained by Faraday rotation magneto optics. s vs. t plots will be presented. Additionally we studied under which conditions it is possible to nucleate dendrites in MgB₂ and YBCO. We found that the nucleation of dendrites depends not only on temperature and exernal field but also on the size of the area, which is heated.