Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 23: Posters Superconductivity, Solids at Low Temperature
TT 23.4: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU D
Preparation and Characterization of thin Superconducting MgB2 Films — •A. Sidorenko1,2, V.I. Zdravkov2, E. Nold3, Th. Koch4, and Th. Schimmel1,4 — 1Institute of Applied Physics, Universität Karlsruhe, D-76128 Karlsruhe — 2Institute of Applied Physics, MD-2028 Kishinev, Moldova — 3Institute of Materials Research I, Forschungszentrum Karlsruhe, D-76021 Karlsruhe — 4Institute of Nanotechnology, Forschungszentrum Karlsruhe, D-76021 Karlsruhe
Superconducting MgB2 films with a critical temperature, Tc , up to 39.3 K were prepared in a new way by DC-magnetron sputtering from a composite target containing MgB2 and metallic Mg in approximately equal amounts and ex-situ annealing in Mg vapour using an especially designed Nb reactor. The AFM imaging show a very smooth and homogeneous morphology of the film surfaces which were deposited with this method on (100) - sapphire substrates. Depth profile scanning auger analysis of the thin MgB2 layers detected the presence of oxygen in only small regions of 10 nm thickness near the surface of the film and near the interface between the substrate and the MgB2 layer. The parameters of the MgB2 films which influence Tc, are discussed.