Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity: Poster Session
TT 15.1: Poster
Dienstag, 26. Februar 2008, 14:00–18:00, Poster B
Superconducting MgB2 films with introduced artificial pinning centers — •Anatoli Sidorenko1,2, Vladimir Zdravkov1, Andrei Surdu1, Günter Obermeier3, Christoph Frommen4, Stefan Walheim4, Thomas Koch2,4, and Thomas Schimmel2,4 — 1Institute of Electronic Engineering and Industrial Technologies ASM, Kishinev MD2028, Moldova — 2Institute of Applied Physics, University of Karlsruhe, D-76128 Karlsruhe, Germany — 3Institute of Applied Physics, University Augsburg, 86159 Augsburg, Germany — 4Institute of Nanotechnology, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany
High quality superconducting magnesium diboride films were prepared using DC-magnetron sputtering and post annealing in Mg vapor within a specially designed Nb reactor. The influence of embedded gold nano particles on resistive transition broadening in external magnetic field has been investigated. The transition broadening in strong magnetic fields could be explained by the change of the effective dimensionality of superconductivity nucleation in magnesium diboride, because of the dimensional crossover of fluctuations.
The work was supported by the BMBF project 01/007 Superconducting Magnesium Diboride Films for Techical Application, and the project Poziţionarea forţei de pinning si creşterea curentului critic in MgB2 si applicatiile technice.