COUPLED FLUXON MODES IN STACKED NB ALOX/NB LONG JOSEPHSON-JUNCTIONS/

Citation
Av. Ustinov et al., COUPLED FLUXON MODES IN STACKED NB ALOX/NB LONG JOSEPHSON-JUNCTIONS/, Physical review. B, Condensed matter, 48(14), 1993, pp. 10614-10617
Citations number
14
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
48
Issue
14
Year of publication
1993
Pages
10614 - 10617
Database
ISI
SICI code
0163-1829(1993)48:14<10614:CFMISN>2.0.ZU;2-1
Abstract
The current-voltage characteristics of N vertically stacked Nb-based l ong Josephson junctions (N = 1, 2, 3) are measured. For a single junct ion in the stack, we observe the splitting of the flux-flow mode into M modes, each of them being characterized by different magnetic field dependence and by different cavity-resonance (Fiske-mode) frequency. O ur results suggest that a fluxon moving in one junction in the stack m ay experience M = N different Swihart velocities due to the coupling t o adjacent junction(s) through the common electrode(s) of the thicknes s smaller than the London penetration depth. In the twofold stacks, we find an indication for a coherent mode corresponding to coupled fluxo n arrays moving in both junctions.