Preparation and study of high-stability Nb–Nb<i>x</i>O<i>y</i>–Pb(ln) Josephson junctions
I. M. DmitrenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRС. И. БондаренкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRN. M. LobodaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRN. A. ChurikovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRG. V. BezuglayaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR
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Josephson tunnel junctions were prepared on Nb–NbxOy–Pb (with an admixture of 5% In). The tunnel barrier was produced by purification of anodic niobium oxide in a high-frequency plasma with subsequent thermal oxidation of a pure portion over a small area. This method yields long-life stable Josephson junctions with a low critical current. The height and the width of such a tunnel barrier are determined from the shape of its current-voltage characteristic.
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