Hysteretic Josephson junctions from YBa2Cu3O7−x/SrTiO3/Ba1−xKxBiO3 trilayer films

3 August 1992

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

Vol. 61 (5) , 595-597
https://doi.org/10.1063/1.107847

Abstract

We have fabricated hysteretic Josephson junctions from YBCO/SrTiO₃/BKBO trilayer films. These large area rf‐sputtered junctions are reproducible, show Shapiro steps in response to microwave radiation, and their Josephson current can be modulated with a small magnetic field up to about 20 K. In addition, geometrical and magnetic field dependent resonances were observed for the first time in cuprate superconductor junctions. The devices appear to be S‐N‐S like without any gap structures discernable in the electrical characteristics. The decay length of critical current with SrTiO₃ layer thickness indicates a normal‐state coherence length in the SrTiO₃ of about 5 Å.

Keywords

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