Fabrication of niobium superconductor-insulator-superconductor junctions with a magnetic tunneling barrier NiOx for millimeter and submillimeter mixer applications

Details Fabrication of niobium superconductor-insulator-superconductor junctions with a magnetic tunneling barrier NiOx for millimeter and submillimeter mixer applications Fabrication of niobium superconductor-insulator-superconductor junctions with a magnetic tunneling barrier NiOx for millimeter and submillimeter mixer applications

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jap....92.2810s&link_type=abstract

Journal of Applied Physics, vol. 92, iss. no. 5, p. 2810-2815

Physics

Condensed Matter

Superconductivity

1

Arrays, Josephson Junctions, Microwave Circuits, Microwave Equipment, Millimeter Waves, Mixing Circuits, Nickel Compounds, Niobium, Oxidation, Radio Astronomy, Radio Telescopes, Sis (Superconductors), Sputtering, Submillimeter Waves, Superconducting Devices, Superconductivity, Thin Films, Modulators And Demodulators, Discriminators, Comparators, Mixers, Limiters, And Compressors, Microwave Circuits, Josephson Devices, Radio Telescopes And Instrumentation, Heterodyne Receivers

Scientific paper

A thin-film superconductor-insulator-superconductor junction with a magnetic barrier, NiOx, and superconducting electrode, Nb, was fabricated. It is shown that the Josephson current was strongly suppressed without external magnetic field. The tunneling barrier was formed by plasma oxidation and or thermal oxidation. The junction with thermal oxidation showed low specific resistance and current-voltage characteristics with a clear energy gap structure. It is shown that this junction has the potential for quasiparticle mixer working at higher submillimeter wave frequency region above approx700 GHz, especially suited for making an imaging array.

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