Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.35: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Critical current of Nb-(Nb/Pd_0.95Fe_0.05)-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-Pd_0.95Fe_0.05 bi-layers with lengths between 200 and 500 nm. The critical current (I_C) of the Nb-Pd_0.95Fe_0.05 bi-layer is found to be significantly reduced by the weak ferromagnetism in the Pd_0.95eFe_0.05 alloy. We have studied the temperature and magnetic field (B) dependencies of the critical current. In magnetic field an irregular supercurrent interference pattern I_C(B) is observed. The shape of the I_C(B) oscillations is similar to that observed for grain boundary junctions between cuprate superconductors. We also investigate the dependence of I_C(B) oscillations on the orientation of the magnetic field.