Collective modes and Josephson vortices in a heterotic Josephson junction between single- and two-gap superconductors

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• 作者：Yukihiro Ota ; Masahiko Machida ; Tomio Koyama ; Hideki Matsumoto
• 关键词：Josephson junctions ; Multi-band superconductors ; Iron-based superconductors ; ± ; s-Wave symmetry ; Josephson plasma mode ; Josephson&#x2013 ; Leggett mode ; Josephson vortex
• 刊名：Physica C
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：470
• 期：Supplement 1
• 页码：S882-S883
• 全文大小：219 K

文摘

We construct a theory of a heterotic Josephson junction between single- and two-gap superconductors. The theory predicts the presence of in-phase and out-of-phase collective modes of superconducting phases. The former is the Josephson plasma mode, and the latter is a counterpart of Leggett’s mode in Josephson junctions. A signature for ±s-wave superconductivity is a drastic reduction of the frequency of the Josephson plasma mode. We also show 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.