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

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

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
Volume78
Issue number2
DOIs
Publication statusPublished - Feb 1 2009
Externally publishedYes

Keywords

  • Muon spin rotation
  • Order parameter
  • Oxypnictide superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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