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Improved Josephson Junction

IP.com Disclosure Number: IPCOM000083792D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Mueller, KA: AUTHOR

Abstract

Electrodes in conventional Josephson junctions are made of lead or niobium or their alloys. The insulation layer between the electrodes is of the oxyde of the electrode metal.

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Improved Josephson Junction

Electrodes in conventional Josephson junctions are made of lead or niobium or their alloys. The insulation layer between the electrodes is of the oxyde of the electrode metal.

The electrode metal should have a transition temperature well above the boiling temperature of helium. Also it should form a chemically well-defined oxyde of high hardness and good dielectric quality. in order to be reproducible and to reliably withstand repeated cycling between room temperature and that of liquid helium.

Some metals, as beryllium alloy and zirconium have the necessary properties. An alloy of beryllium with 1-5% rhenium has a transition temperature of 9.5 degrees K. An alloy of beryllium with technetium has 5.25 degrees K. Oxydes of both are mechanically hard and have excellent dielectric properties.

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