Inter-granular current in iron-oxypnictide superconductors

T. Tamegai, Y. Tsuchiya, Y. Nakajima, Y. Kamihara, H. Hosono

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Inter- and intra-granular currents, Jcinter and Jcintra, in LaFePO0.94F0.06 polycrystalline sample are evaluated by measuring the remanent-state field profile using magneto-optical imaging method. Obtained images show the absence of magnetic field modulation associated with the weak-link nature of grain boundaries, indicating that Jcinter and Jc intra are comparable in magnitude in contrast to other iron-arsenide superconductors. Jcinter is estimated to be 2 × 104 A/cm2 in the limit of T= 0 K, which is larger than the values in other iron-arsenide superconductors. Implication of these J c behavior is discussed in relation with possible pairing symmetries.

Original languageEnglish
Pages (from-to)993-995
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume470
Issue number20
DOIs
Publication statusPublished - 2010 Nov 1
Externally publishedYes

Keywords

  • Inter-granular critical current
  • Iron-oxypnictide
  • Magneto-optical imaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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