Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Superconductivity - Heterostructures, Andreev Scattering, Proximity Effect, Coexistence
TT 9.1: Vortrag
Montag, 26. März 2007, 16:15–16:30, H20
Nb Layers with Advanced Superconducting Properties as a Base for Proximity Effect Investigation. — •Anatolie Sidorenko1,2, Vladimir Zdravkov1, Andrei Prepelitsa1, and Andrei Sudru1 — 1Institute of Electronic Engineering and Industrial Technologies ASM, MD-2028 Kishinev, Moldova — 23Institute of Nanotechnology, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany
High quality, large area Nb films (size 500 mm x mm) and constant thickness were deposited by DC magnetron sputtering in a commercial *Leybold Z400* vacuum system. Homogeneity and proper thickness of the Nb layer provided by the target-holder movement during the DC sputtering was achieved by using a specially constructed arrangement including a PC-controllable motor with gear. Rutherford backscattering spectrometry was used for precise thickness measurements. An increase of the superconducting parameters, i.e. the critical temperature rose more than 1.5 K and the superconducting coherence length was 30-35 % larger in comparison with the parameters for films with comparable thickness, which were prepared with common technique, was observed. The developed preparation technique for Nb films was used as a base for proximity effect investigation in layered S/F structures.