Theory of vortex structure in Josephson junctions with multiple tunneling channels: Vortex enlargement as a probe of ±s -wave superconductivity

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We theoretically study Josephson vortex structures in Josephson junctions which have multiple tunneling channels caused by multiple superconducting gaps. Deriving "coupled sine-Gordon equations" from the free-energy taking account of the multiple tunneling channels, we examine two typical situations, a heterotic junction composed of multigap-superconductor, insulator, and single-gap superconductor, and a grain-boundary junction formed by two identical multigap superconductors. Then, we reveal in both situations that the magnetic field distribution of the Josephson vortex for ±s -wave superconductivity is more enlarged than that for s wave without sign change between the order parameters. Its mechanism is ascribed to a cancellation of the multiple Josephson currents. We display such an anomalous Josephson vortex and suggest how to evaluate the enlargement.

Original languageEnglish
Article number014502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number1
DOIs
Publication statusPublished - 2010 Jan 5

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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