Overdamped Nb/Al-AlO{sub x}/Nb Josephson junctions

Journal Article · Sun Jan 23 23:00:00 EST 2005 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1856135· OSTI ID:20636969

Lacquaniti, V; Cagliero, C; Maggi, S; Steni, R ^[1]

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1. Thin Films Department, IEN 'G. Ferraris', Strada delle Cacce 91, I-10135, Torino (Italy)

We report the fabrication and characterization of overdamped Nb/Al-AlO{sub x}/Nb superconductor-insulator-superconductor Josephson junction whose fabrication process derives from that of the well-known hysteretic junctions. These junctions are an intermediate state between the superconductor-normal metal-superconductor and the superconductor-insulator-superconductor Josephson junctions. Stable and reproducible nonhysteretic current-voltage characteristics are obtained with a proper choice of the fabrication parameters. We have measured critical current densities J{sub C} from 10{sup 3} up to 2x10{sup 4} A/cm{sup 2}, with characteristic voltages from 80 to nearly 450 {mu}V. The junctions are stable against time and repeated thermal cycling.

• OSTI ID: 20636969
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 86; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM OXIDES
CRITICAL CURRENT
CURRENT DENSITY
DEPOSITION
ELECTRIC POTENTIAL
FABRICATION
INTERMEDIATE STATE
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
NIOBIUM
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMAL CYCLING
THIN FILMS