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Two-particle structures in high quality Nb/AlOx/Nb Josephson tunnel junctions

✍ Scribed by R. Cristiano; L. Frunzio; R. Monaco; C. Nappi; S. Pagano

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
126 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

We have investigated both theoretically and experimentally the two-particle structures, which appear at low temperature in high quality Nb/A1Ox/Nb Josephson tunnel junctions in the subgap region of the current-voltage characteristics. We performed measurements on low Josephson critical current density junctions and the results are discussed in the framework of the multiparticle tunnel theory.

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Fabrication of stable Nb-based Josephson
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High quality Nb films with superconducting Tc'S of 9.3 K and residual resistance ratios of 3-5.5 have been fabricated by e-beam evaporation in an ordinary high vacuum system. Nb/Pb tunnel junctions of good quality (Vm ~ 13 mV,jc ~ 400 A cm -2) were prepared using an ion beam oxidation technique. The