Nonlocal response of grain-boundary-type Josephson junctions to local perturbation

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.7727· OSTI ID:115876

Mayer, B; Schulze, H; Fischer, G M; Gross, R ^[1]

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1. Physikalisches Institut, Lehrstuhl Experimentalphysik II, Universitaet Tuebingen, Morgenstelle 14, D-72076 Tuebingen (Germany)

The effect of a focused electron or laser beam on the critical current of Josephson junctions with grain-boundary geometry is analyzed using a numerical iteration method. Beyond a change in the critical current which is proportional to the local critical current density in the irradiated junction region, there is an additional change of the critical current due to a nonlocal modification of the phase difference function. For Josephson junctions larger than the Josephson penetration depth this nonlocal contribution is significant and the total electron beam induced change of the critical current is no longer proportional to the local Josephson current density. Our model calculations are compared to experimental results obtained from the analysis of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} grain-boundary Josephson junctions (GBJ`s) using low temperature scanning electron microscopy (LTSEM). Comparing the LTSEM measurements to the model calculations gives information on the spatial homogeneity of the critical current density, the influence of the junction geometry on the distribution of the Josephson current density, and the spatial structure of static magnetic flux states.

• OSTI ID: 115876
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CRITICAL CURRENT
ELECTRON BEAMS
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
JOSEPHSON JUNCTIONS
MAGNETIC FLUX
NUMERICAL SOLUTION
PENETRATION DEPTH
RADIATION EFFECTS