Fabrication of niobium SIS junctions with a magnetic tunneling barrier NiO sub(x )

We report on the fabrication of a new type of superconductor-insulator-superconductor junctions with intrinsically vanishing Josephson current. We have fabricated junctions with a tunneling barrier containing oxidized 3d transition metal Ni, i.e., Nb/NiO sub(x)/Nb and Nb/NiO sub(x)/Al/Nb stacked jun...

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Published inPhysica. C, Superconductivity Vol. 378-381; pp. 1310 - 1313
Main Authors Seko, Kazuyuki, Ichikawa, Yoshiko, Terajima, Ryo, Sakai, Joe, Imai, Syozo
Format Journal Article
LanguageEnglish
Published 01.10.2002
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Summary:We report on the fabrication of a new type of superconductor-insulator-superconductor junctions with intrinsically vanishing Josephson current. We have fabricated junctions with a tunneling barrier containing oxidized 3d transition metal Ni, i.e., Nb/NiO sub(x)/Nb and Nb/NiO sub(x)/Al/Nb stacked junctions. In the junction fabrication process, we used a conventional RIE technique called selective niobium etch process. The junction size was varied from 2.5 x 2.5 to 10 x 10 mu m super(2). The Josephson current of these junctions was suppressed to zero or nearly zero, while a sharp gap structure was also observed. This new-type device will be promising in realizing a highly integrated mixer. copyright 2002 Elsevier Science B.V. All rights reserved.
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ISSN:0921-4534