High-temperature superconducting Josephson fluxon–antifluxon transistors

18 November 1996

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 69 (21) , 3257-3259
https://doi.org/10.1063/1.118028

Abstract

We have realized the Josephson fluxon–antifluxon transistor (JFAT) in high temperature superconductivity using an asymmetric control line on top of either bicrystal junctions or Co‐doped YBa₂Cu₃O_x superconductor–normal–superconductor (SNS) junctions. We have measured current gains as high as 6 for 30 μm‐wide bicrystal JFATs (30 K) and as high as 3 for Co‐doped SNS JFATs (50 K). An improvement in gain over the Josephson vortex flow transistor, due to improved coupling efficiency, is demonstrated. There is also a reduction of control line inductance that should lead to an improvement in gate speed.

Keywords

FLUXONS
SUPERCONDUCTING DEVICES
TRANSISTORS
JOSEPHSON JUNCTIONS
HIGH−TC SUPERCONDUCTORS
FLUX QUANTIZATION
YTTRIUM OXIDES
BARIUM OXIDES
COPPER OXIDES
COBALT ADDITIONS

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