2008/12/18 by M. Hiraishi, R. Kadono, Soshi Takeshita +8 · 38 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Condensed matter physics #Corporate Taxation and Avoidance #Coupling (piping) #Iron-based superconductors research #Materials science #Muon #Muon spin spectroscopy #Nuclear physics #Order (exchange) #Pairing #Physics #Spin (aerodynamics) #Superconductivity #Superfluidity #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.78.023710
published in Journal of the Physical Society of Japan 78(2), 023710 (Physical Society of Japan) · 4 pages, 3 figures
arxiv created 2008/12/18 · openalex publication_date 2009/02/10 · arxiv updated 2009/12/01 · openalex created_date 2017/10/06 · openalex updated_date 2026/08/05
Superfluid density (ns) in the mixed state of an iron pnictide superconductor Ba0.6K0.4Fe2As2 is determined by muon spin rotation for a sample with optimal doping (x=0.4). The temperature dependence of ns is perfectly reproduced by the conventional BCS model for s-wave paring, where the order parameter can be either a single-gap with Δ=8.35(6) meV [2Δ/kBTc=5.09(4)], or double-gap structure with Δ1=12 meV (fixed) [2Δ1/kBTc=7.3] and Δ2=6.8(3) meV [2Δ2/kBTc=4.1(2)]. The latter is consistent with the recent result of angle-resolved photo-emssion spectroscopy. The large gap parameters (2Δ/kBTc) indicate extremely strong coupling of carriers to bosons that mediate the Cooper pairing.