Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 26: Superconductivity: Vortex Dynamics, Vortex Phases, Pinning

TT 26.6: Talk

Wednesday, February 27, 2008, 17:15–17:30, H 3010

Critical Currents in YBa₂Cu₃O_7−δ/La_2/3Ca_1/3MnO₃ Hybrid Structures — •Märit Djupmyr¹, Soltan Soltan², Hanns-Ulrich Habermeier², and Joachim Albrecht¹ — ¹MPI für Metallforschung, Heisenbergstr. 3, D-70569 Stuttgart — ²MPI für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart

The local critical current density in hybrid structures of high-temperature superconducting YBa₂Cu₃O_7−δ and ferromagnetic La_2/3Ca_1/3MnO₃, grown on vicinal cut substrates is measured with high accuracy using a spatially resolved magneto-optical method. A detailed study of the temperature dependence of the critical current in the film gives information about the flux pinning mechanisms. In YBCO thin films different pinning mechanisms has been found depending on temperature and microstructure of the film. We have studied what influence the ferromagnetic layer has on these pinning mechanisms and the critical current. Found were a substantial modification of the critical current that could be explained by a transfer of an inhomogeneous magnetic induction distribution from the ferromagnet to the superconductor