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Some properties of Nb-Nb2O5-Pb(In) Josephson tunnel junctions for devices applications

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2 Author(s)
Villegier, J.C. ; Commissariat à ĺEnergie Atomique, Grenoble France ; Matheron, G.

A detailed investigation of tunneling has been carried out on Nb-Nb2O5-Pb(In) junctions where the tunnel barrier is made-of Nb2O5thermal oxide with accurately controlled oxidation parameters. The oxide barrier appears as a n-type semiconductor with two Schottky barriers at the interfaces. The transport of charged oxygen vacancies is supposed to play a fundamental role in the oxidation process. The barrier potential φ and the tunnel resistance R have been related to the oxidation parameters. The junctions realized have sizes ranging from 4 to 104μm2, the Josephson current density, dependent on the oxide thickness, is in the 1-105A/cm2range. Very low transition times from the superconductive to the normal state have been observed.

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Magnetics, IEEE Transactions on  (Volume:17 ,  Issue: 1 )