SNS Junctions for AC Josephson Voltage Standards

We developed and fabricated series arrays of overdamped SNS Josephson junctions for AC Josephson voltage standards (S: superconductor, N: normal conductor). The junctions are based on NbxSi1-x barriers allowing nearly independent tuning of critical current density and characteristic voltage by varyi...

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Bibliographic Details
Published in:Physics procedia 2012, Vol.36, p.48-52
Main Authors: Scheller, T., Mueller, F., Wendisch, R., Kieler, O., Springborn, U., Stoerr, K., Egeling, B., Weimann, T., Palafox, L., Behr, R., Kohlmann, J.
Format: Article
Language:English
Subjects:
Josephson arrays
Programmable Josephson voltage standard
SNS junction
superconducting devices
thin-film devices
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Summary:We developed and fabricated series arrays of overdamped SNS Josephson junctions for AC Josephson voltage standards (S: superconductor, N: normal conductor). The junctions are based on NbxSi1-x barriers allowing nearly independent tuning of critical current density and characteristic voltage by varying niobium content and thickness of the barrier. We optimised the junction barrier deposition for the co-sputtered NbxSi1-x so that we are able to fabricate Josephson junction series arrays with up to 69,632 junctions for output voltages up to 10V under 70GHz microwave irradiation. The width of the constant-voltage steps at 10V exceeds 1mA for a typical critical current of about 3mA.
ISSN:1875-3892
1875-3892
DOI:10.1016/j.phpro.2012.06.128