Abstract
We report the demonstration of dc and ac Josephson effects as well as conductance spectra measurements on Nb/Al2O3/Al/MgB2 thin films heterostructure. The heterostructure exhibits moderately hysteretic current-voltage characteristic with a dc Josephson current branch and regular microwave-induced Shapiro steps. Conductance spectra measurements point toward a two-gap scenario and are explained with the probable presence of tunneling both from dirty limit regions, reflecting a proximized order parameter Δdirty ≈ 2 meV , and from clean limit regions, reflecting a proximized order parameter Δ3D ≈ 0.9 meV .
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