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YBCO Josephson Junctions and Striplines for RSFQ Circuits Made by Ion Irradiation

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7 Author(s)
Thomas Wolf ; Laboratoire de Physique et d'Étude des Matériaux (Unité Mixte de Recherche 8213), École Supérieure de Physique et de Chimie Industrielles-Université Pierre et Marie Curie-Centre National de la Recherche Scientifique, Paris, France ; Nicolas Bergeal ; Jérôme Lesueur ; Coenrad J. Fourie
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We have investigated the electrodynamic properties of high-Tc Josephson junctions (JJs) and striplines made by ion irradiation in order to evaluate the potential of such a technology for low-power rapid single flux quantum superconductor digital electronics. The process is briefly presented, together with the JJ characteristics in the context of high-speed electronics. Line inductances of different geometries and at different temperatures have been measured through superconducting quantum interference device (SQUID) modulation. A detailed comparison with 3-D numerical calculations has been made, and a quantitative agreement that shows typical values of 4-8 pH per square without a ground plane, depending on linewidth and the gap to the ground line, has been obtained.

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IEEE Transactions on Applied Superconductivity  (Volume:23 ,  Issue: 2 )