Fluxon dynamics in long annular Josephson tunnel junctions

N. Martucciello, Jesper Mygind, V.P. Koshelets, A.V. Shchukin, L. Filippenko, R Monaco

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Single-fluxon dynamics has been experimentally investigated in high-quality Nb/Al-AlOx/Nb annular Josephson tunnel junctions having a radius much larger than the Josephson penetration depth. Strong evidence of self-field effects is observed. An external magnetic field in the barrier plane acts on the fluxon as a periodic potential and lowers its average speed. Further, the results of perturbative calculations do not fit the experimental current-voltage profile and, provided the temperature is low enough, this profile systematically shows pronounced deviations from the smooth predicted form. The deviations take the form of fine, hysteretic, almost equally spaced structures.
Original languageEnglish
JournalPhysical Review B
Issue number9
Pages (from-to)5444-5449
Publication statusPublished - 1998

Bibliographical note

Copyright (1998) by the American Physical Society.




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