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Experimental study of flux flow and resonant modes in multi-junction Josephson stacks

Thyssen, N.; Kohlstedt, H.; Ustinov, Alexey V.


Magnetic field dependence of current-voltage characteristics of 7-layer stacked Nb/Al-AlO/sub x//Nb long Josephson junctions are investigated experimentally. The magnetic coupling between the junctions is provided by their common superconducting electrodes of the thickness smaller than the London penetration depth. The current-voltage characteristics clearly display collective flux-flow behaviour of Josephson vortices (fluxons) which simultaneously move in up to 5 layers of the stack under the influence of the bias current. The flux-flow behaviour is modulated by a complicated structure of cavity-like resonances which show a broad range of characteristic frequencies. Our observations can be qualitatively explained as the interplay between the Fiske modes and the two-dimensional resonances in these stacks. For the intermediate magnetic field range, we find pronounced resonant modes with large voltage spacing which indicates mutually coherent operating junctions.

DOI: 10.1109/77.621903
Zitationen: 8
Web of Science
Zitationen: 9
Zitationen: 8
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 1997
Sprache Englisch
Identifikator ISSN: 1051-8223, 1558-2515
KITopen-ID: 1000075677
Erschienen in IEEE transactions on applied superconductivity
Verlag Institute of Electrical and Electronics Engineers (IEEE)
Band 7
Heft 2
Seiten 2901–2904
Nachgewiesen in Web of Science
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