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Journal of Low Temperature Physics

Static characteristics of superconducting interferometers with Nb-NbO x -PbIn Josephson junctions

Anna Maria Cucolo, M. R. Saggese, G. Patern�

Published Apr 1, 1983• 3 citations
Publisher
DOI
10.1007/bf00683413

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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.
We have measured the low-frequency noise in the critical current Ic of six dc superconducting quantum interference devices (SQUIDs) with resistively shunted Nb–NbOx–PbIn Josephson junctions in the temperature range T=0.09–4.2K. Each device is voltage biased, the applied flux is an integer number of flux quanta, and the current fluctuations are measured with a second dc SQUID. At low frequencies f, there is a component of the power spectrum of the critical current fluctuations given approximately by SIc(f)=CIc2T2∕Af, where A is the area of both junctions, and C≈(3.9±0.4)×10−23m2∕K2. For quantum bits based on Josephson junctions, the scaling of SIc(f) with T2 implies that the dephasing time limited by critical current l∕f noise should scale as 1∕T for temperatures down to at least 0.09K.