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Reduction of Subgap Conductance of Tunnel Barriers

IP.com Disclosure Number: IPCOM000059267D
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Raider, SI Ronay, M [+details]

Abstract

Subgap conductance of tunnel junctions in Josephson and three- terminal superconducting devices is decreased at high current densities by lowering the height of the insulating tunnel barrier. This is accomplished by introducing alkali ions at the barrier-superconductor interface. The addition of alkali ions, such as cesium, increases tunneling current and produces a more uniform barrier with lower subgap conductance. Increases in barrier thickness and current density reduce the RC time constant of the junction.