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IEEE Transactions on Magnetics

Planar interferometers with two Nb-NbOxPbIn Josephson junctions

Anna Maria Cucolo, Gianfranco Paternò

Published May 1, 1983• 2 citations
Publisher

Abstract

Two different kinds of planar interferometers with two Nb-NbOx-PbIn junctions have been fabricated. The effects of a magnetic field coupled both to the loop and to the junctions have been investigated. A comparison of the experimental results with the theory is reported.
DOI
10.1109/tmag.1983.1062392

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Planar interferometers with two Nb-NbOx-Pbln functions have been fabricated. Because of the peculiar configuration adopted, both a symmetric and an asymmetric current bias are possible on the same sample. The loop area is on a plane perpendicular to the cross section of the functions, and, therefore, the flux coupled to them is negligible. ThreshoM curves have been measured for different values of the characteristic parameter fl = LI1/qbo, where 1i and L are the maximum Josephson current and the inductance of the interferometer and C~o is the flux quantum. The dependence of the current modulation depth upon fl has been also investigated. A comparison of the experimental data with the theory shows quantitative agreement.
Resonances in the current-voltage characteristics of interferometers with two Nb-NbOx-Pb window junctions have been experimentally investigated. The data are compared with the theoretical curves computed both for the voltage and for the magnetic field dependence of the resonance amplitudes. Very good agreement is found in all the range of values of the damping parameter Γ=I0 R/Vr, where Vr is the resonant voltage and I0 and R are the maximum Josephson current and the parallel resistance of each junction. New features that cannot be explained in terms of the existing theory have been observed in devices with larger values of the parameter β=2πLI0/Φ0, where L is the loop inductance, and Φ0 is the flux quantum.