A possible method to confirm ± s-wave pairing state using the Riedel anomaly in Fe-pnictide superconductors

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We theoretically propose a method to identify ± s-wave order parameter in recently discovered Fe-pnictide superconductors. Our idea uses the Riedel anomaly in ac-Josephson current through an SI(± S) (single-band s-wave superconductor/insulator/-wave two-band superconductor) junction. We show that the Riedel peak effect leads to vanishing ac-Josephson current at some values of biased voltage. This phenomenon does not occur in the case when the ± s-wave superconductor is replaced by a conventional s-wave one, so that the observation of this vanishing Josephson current would be a clear signature of ± s-wave pairing state in Fe-pnictide superconductors.