Full gap superconductivity in Ba 0:6K 0:4Fe 2As 2 probed by muon spin rotation

Masatoshi Hiraishi, Ryosuke Kadono, Soshi Takeshita, Masanori Miyazaki, Akihiro Koda, Hirotaka Okabe, Jun Akimitsu

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36 Citations (Scopus)


Superfluid density (n s) in the mixed state of an iron pnictide superconductor Ba 1-xK xFe 2As 2 is determined by muon spin rotation for a sample with optimal doping (x = 0:4). The temperature dependence of n s is perfectly reproduced using the conventional BCS model for s-wave paring, where the order parameter can be either a single-gap structure with Δ = 8:35(6) meV [2Δ/k BT c = 5:09(4)] or double-gap structure with Δ 1 = 12 meV (fixed) [2Δ 1/k BT c = 7:3] and Δ 2 = 6:8(3) meV [2Δ 2/ k BT c = 4:1(2)]. The latter is consistent with the recent result obtained by the angle-resolved photoemission spectroscopy. The large gap parameters (2Δ/k BT c) indicate the extremely strong coupling of carriers to bosons that mediate the Cooper pairing.

Original languageEnglish
Article number023710
Journaljournal of the physical society of japan
Issue number2
Publication statusPublished - Feb 2009
Externally publishedYes


  • Muon spin rotation
  • Order parameter
  • Oxypnictide superconductor

ASJC Scopus subject areas

  • General Physics and Astronomy


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