Full Gap Superconductivity in Ba0.6K0.4Fe2As2 Probed by Muon Spin Rotation

被引：32

作者：

Hiraishi, Masatoshi ^{[1
]}

Kadono, Ryosuke ^{[1
,2
]}

Takeshita, Soshi ^{[2
]}

Miyazaki, Masanori ^{[1
]}

Koda, Akihiro ^{[1
,2
]}

Okabe, Hirotaka ^{[3
]}

Akimitsu, Jun ^{[3
]}

机构：

[1] Grad Univ Adv Studies, Sch High Energy Accelerator Sci, Dept Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[2] KEK, High Energy Accelerator Res Org, Inst Mat Struct Sci, Muon Sci Lab, Tsukuba, Ibaraki 3050801, Japan

[3] Aoyama Gakuin Univ, Dept Math & Phys, Kanagawa 2298558, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 02期

关键词：

oxypnictide superconductor; order parameter; muon spin rotation;

D O I：

10.1143/JPSJ.78.023710

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Superfluid density (ns) in the mixed state of an iron pnictide superconductor Ba1-xKxFe2As2 is determined by muon spin rotation for a sample with optimal doping (x = 0.4). The temperature dependence of it, is perfectly reproduced using the conventional BCS model for s-wave paring, where the order parameter can be either it single-gap structure with Delta = 8.35(6) meV [2 Delta/k(B)T(c) = 5.09(4)] or double-gap structure with Delta(1) - 12 meV (fixed) [2 Delta(1)/k(B)T(c) - 7.3] and Delta(2) = 6.8(3) meV [2 Delta(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 (2 Delta/k(B)T(c)) indicate the extremely Strong coupling of carriers to bosons that mediate the Cooper pairing.

引用

页数：4

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