Transport properties of Nb/PdNi bilayers and Nb/PdNi/Nb Josephson junctions
نویسنده
چکیده
The superconducting proximity effect was examined in both Nb/PdNi (SF) bilayer films and Nb/PdNi/Nb (SFS) Josephson junctions. In Nb/PdNi bilayer films, nonmonotonic behavior of Tc was observed as a function of PdNi thickness dF. The effective exchange energy Eex extracted from the data was about 13 meV. In Nb/PdNi/Nb (SFS) Josephson junctions, the existence of a crossover between the 0 state and the π state was confirmed in the PdNi thickness dependence of Ic. For the junction with dF = 9 nm, such a crossover was observed in the temperature dependence of Ic. Eex estimated from the junctions characteristics was about 19 meV. These behaviors can be interpreted from the view point of a damped oscillatory superconducting order parameter induced at the SF interface.
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