Retrieval of critical current distribution in small Josephson junctions

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.119864· OSTI ID:538385

Nesher, O; Ribak, E N ^[1]

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1. Department of Physics, Technion, Technion City, Haifa 32000 (Israel)

We have developed a method to retrieve or to estimate the spatial critical current distribution in a small Josephson junction from a critical current measurement in a magnetic field (the junction size is in reference to the Josephson length). The method is based on an iterative algorithm that uses fast Fourier transform and physical constraints to achieve the proper solution(s). We simulated some typical critical current distributions and the algorithm converged to a single solution. We applied the algorithm to measurements of the critical current of grain boundary junctions of an oxygen deficient YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin film. The convergence was always to one of a very few solutions very similar in nature. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 538385
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 71; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALGORITHMS
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
FOURIER TRANSFORMATION
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
ITERATIVE METHODS
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
MAGNETIC FIELDS
SUPERCONDUCTING FILMS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES