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Josephson Junction with Negligible Hysteresis

IP.com Disclosure Number: IPCOM000080317D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Jutzi, WW: AUTHOR

Abstract

Self-resetting of Josephson junctions is often impeded by an undesirably large hysteresis loop. If the junction exceeds a certain size, resonances generated in a control field can seriously limit the voltage swing across the junction of logic circuits. Both inconveniences are avoided by loading the junction with ohmic resistance. It is proposed to distribute the resistance over the junction area, so that the characteristic parameter beta =2.pi. Reff/2/ . C . I 0(o) is sufficiently small. Reff is the effective junction resistance, C the junction capacitance, I the maximum Josephson current and 0(o) the flux quantum.

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Josephson Junction with Negligible Hysteresis

Self-resetting of Josephson junctions is often impeded by an undesirably large hysteresis loop. If the junction exceeds a certain size, resonances generated in a control field can seriously limit the voltage swing across the junction of logic circuits. Both inconveniences are avoided by loading the junction with ohmic resistance. It is proposed to distribute the resistance over the junction area, so that the characteristic parameter beta =2.pi. Reff/2/ . C . I 0(o) is sufficiently small. Reff is the effective junction resistance, C the junction capacitance, I the maximum Josephson current and 0(o) the flux quantum.

On a suitable substrate 1 there are arranged a pair of superconductive electrodes 2 and 3 which are separated by thin insulating layer 4. Electrodes 2 and 3 have dispersed in their superconducing area, confined zones 5 of normal conductivity. The zones 5 introduce the desired resistive loading.

One method to make this junction includes the deposition of a superconductor - normal conductor alloy for electrodes, and oxidation of these electrodes in a oxygen-argon atmosphere.

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