Identification of the ±s -wave pairing state in iron-pnictide superconductors using the Riedel anomaly

Daisuke Inotani, Yoji Ohashi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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 a SI (±S) (single-band s -wave superconductor/insulator/ ±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 ±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.

Original languageEnglish
Article number224527
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number22
DOIs
Publication statusPublished - 2009 Jun 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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