Vortex structure and cavity modes in stacked double Nb/AlOx/Nb Josephson junctions

S. N. Song*, S. Maglic, C. D. Thomas, Melville P Ulmer, John B Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We have studied the static I-V characteristics and cavity modes in stacked double Nb/AlOx/Nb Josephson junctions. In junction stacks consisting of two junctions with identical critical currents Ic, the Ic vs H characteristics have been observed to deviate from the usual Fraunhofer pattern in the small junction limit; the data are consistent with a model involving a structural phase transformation to a triangular vortex lattice with increasing H. In a finite voltage state interlayer coupling leads to splitting of the Swihart mode, which manifests itself as Fiske steps with different voltage spacings. The results provide clear evidence that the two junctions in the stack do phase lock.

Original languageEnglish (US)
Pages (from-to)2949-2954
Number of pages6
JournalJournal of Applied Physics
Volume80
Issue number5
DOIs
StatePublished - Sep 1 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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