Full Gap Superconductivity in Ba0.6K0.4Fe2As2 Probed by Muon Spin Rotation
- 15 February 2009
- journal article
- letter
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 78 (2)
- https://doi.org/10.1143/jpsj.78.023710
Abstract
Superfluid density ( n s ) in the mixed state of an iron pnictide superconductor Ba 1- x K x Fe 2 As 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 B T c =5.09(4)] or double-gap structure with Δ 1 =12 meV (fixed) [2Δ 1 / k B T c =7.3] and Δ 2 =6.8(3) meV [2Δ 2 / k B T 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 B T c ) indicate the extremely strong coupling of carriers to bosons that mediate the Cooper pairing.Keywords
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