Experimental study of fluxon resonances in window-type long Josephson junctions

Author

Thyssen, N. ; Ustinov, A.V. ; Kohlstedt, H. ; Pagano, S. ; Caputo, J.G. ; Flytzanis, N.

Author_Institution

Forschungszentrum Julich GmbH, Germany

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2965

Lastpage

2968

Abstract

We report first systematic measurements of zero-field steps in I-V characteristics of long Nb/Al-AlO/sub x//Nb Josephson junctions made in a window of a stripline structure. We compared the data for junction series of the same dimensions but with different ratio of the junction width W to the width of the idle window part W´ surrounding them. Zero-field steps were found to be stable only in structures with W´/W<3. With increasing the ratio W´/W, the effective fluxon propagation velocity is found to increase and fine structure resonances appear on fluxon resonant steps. Experimental data are compared with numerical simulations using the modified two-dimensional sine-Gordon equation and qualitative agreement is found.<>

Keywords

Josephson effect; I-V characteristics; Nb-Al-AlO-Nb; Nb/Al-AlO/sub x//Nb; fluxon propagation velocity; fluxon resonances; long Josephson junctions; numerical simulation; stripline; two-dimensional sine-Gordon equation; window; zero-field steps; Electrodes; Geometry; Intersymbol interference; Josephson junctions; Niobium; Numerical simulation; Physics; Resonance; Stripline; Superconducting epitaxial layers;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403214

Filename

403214