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Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.35: Poster

Tuesday, February 26, 2008, 14:00–18:00, Poster B

Critical current of Nb-(Nb/Pd0.95Fe0.05)-Nb Josephson junctions — •O. Vávra, W. Meindl, and C. Strunk — Institut für experimentelle und angewandte

The antagonism of superconductivity and magnetism is investigated by fabricating Nb based Josephson Junction with lateral weak links consisting of Nb-Pd0.95Fe0.05 bi-layers with lengths between 200 and 500 nm. The critical current (IC) of the Nb-Pd0.95Fe0.05 bi-layer is found to be significantly reduced by the weak ferromagnetism in the Pd0.95eFe0.05 alloy. We have studied the temperature and magnetic field (B) dependencies of the critical current. In magnetic field an irregular supercurrent interference pattern IC(B) is observed. The shape of the IC(B) oscillations is similar to that observed for grain boundary junctions between cuprate superconductors. We also investigate the dependence of IC(B) oscillations on the orientation of the magnetic field.

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