EFFECT OF GEOMETRY ON FLUXON WIDTH IN A JOSEPHSON JUNCTION

Jean-Guy Caputo, Nikos Flytzanis and Emmanuel Vavalis
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Jean-Guy Caputo: Laboratoire de Mathématiques, Institut de Sciences Appliquees, and U.R.A. C.N.R.S. 1378, BP8, 76131 Mont-Saint-Aignan Cedex, France
Nikos Flytzanis: Physics Department, University of Crete, 71409 Heraklion, Greece
Emmanuel Vavalis: Mathematics Department, University of Crete, 71409 Heraklion, Greece;

International Journal of Modern Physics C (IJMPC), 1996, vol. 07, issue 02, 191-216

Abstract: We investigate the electromagnetic influence of the surrounding idle (no tunneling) region on static fluxons in window Josephson junctions. We calculated the fluxon width as a function of the size of the idle region for three different window (active tunneling area) geometries, namely elongated truncated rhombus, rectangular and bow-tie and derived approximate expressions for the case of small and large idle regions. The window geometry affects both the fluxon width and the fluxon stability. One can define an effectiveλJwhich depends on the junction width, the idle region width and the inductance ratio and has important consequences on the static and dynamic properties of window Josephson junctions. We also show the effect of the idle region on the maximum tunneling current as a function of the external magnetic field.

Keywords: Josephson Junctions; Partial Differential Equations; Solitons (search for similar items in EconPapers)
Date: 1996
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DOI: 10.1142/S0129183196000181

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