Electrodynamics and intrinsic Josephson effects in multi-gap superconductors

Tomio Koyama, Yukihiro Ota, Masahiko Machida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We develop a theory for the Josephson effects in 2-gap intrinsic Josephson junction stacks (IJJ's). The coupled dynamical equations for the phase differences are derived from the low-energy effective Lagrangian. The equations can describe the longitudinal Josephson plasma and the Josephson-Leggett (JL) mode propagating in the direction perpendicular to the junctions. Numerical results for the I - V characteristics are presented. The I - V characteristics shows multiple-branch structure similar to that in Bi-2212 IJJ's. When the Josephson frequency is approached to the JL mode frequency in non-uniform voltage branches, the JL mode is resonantly excited. At the resonant voltage a step-like structure appears in the I - V curves in low-voltage branches.

Original languageEnglish
Article number012036
JournalJournal of Physics: Conference Series
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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