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

Details A possible method to confirm $\pm s$-wave pairing state using the Riedel anomaly in Fe-pnictide superconductors A possible method to confirm $\pm s$-wave pairing state using the Riedel anomaly in Fe-pnictide superconductors

2009-01-13

arxiv.org/abs/0901.1718v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

We theoretically propose a method to identify $\pm s$-wave order parameter in recently discovered Fe-pnictide superconductors. Our idea uses the Riedel anomaly in ac-Josephson current through an SI($\pm$ S) (single-band s-wave superconductor/insulator/$\pm$s-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 $\pm s$-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 $\pm s$-wave pairing state in Fe-pnictide superconductors.

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