Physics – Condensed Matter – Superconductivity
Scientific paper
2009-07-02
Phys. Rev. B 81 014502 (2010)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.81.014502
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 $\pm s$-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.
Koyama Tomio
Machida Masahiko
Matsumoto Hideki
Ota Yukihiro
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