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

Ota, Yukihiro; Machida, Masahiko  ; Koyama, Tomio*; Matsumoto, Hideki*

We theoretically study Josephson vortex structure in Josephson junctions which have multiple tunneling channels caused by multiple superconducting gaps. Deriving coupled sine-Gordon equation from the free energy taking account of the multiple tunneling channels, we examine two typical situations, a heterotic junctions composed of multi-gap 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.

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Percentile:60.34

Category:Materials Science, Multidisciplinary

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