Observation of a ubiquitous three-dimensional superconducting gap function in optimally doped Ba0.6K0.4Fe2As2
文献类型：期刊论文
| 作者 | Xu, YM ; Huang, YB ; Cui, XY ; Razzoli, E ; Radovic, M ; Shi, M ; Chen, GF ; Zheng, P ; Wang, NL ; Zhang, CL ; Dai, PC ; Hu, JP ; Wang, Z ; Ding, H |
| 刊名 | NATURE PHYSICS
 |
| 出版日期 | 2011 |
| 卷号 | 7期号:3页码:198 |
| ISSN号 | 1745-2473 |
| 通讯作者 | Xu, YM (reprint author), Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA. |
| 中文摘要 | The iron-pnictide superconductors have a layered structure formed by stacks of FeAs planes from which the superconductivity originates. Given the multiband and quasi three-dimensional(1) (3D) electronic structure of these high-temperature superconductors, knowledge of the quasi-3D superconducting (SC) gap is essential for understanding the superconducting mechanism. By using the k(z) capability of angle-resolved photoemission, we completely determined the SC gap on all five Fermi surfaces (FSs) in three dimensions on Ba0.6K0.4Fe2As2 samples. We found a marked kz dispersion of the SC gap, which can derive only from interlayer pairing. Remarkably, the SC energy gaps can be described by a single 3D gap function with two energy scales characterizing the strengths of intralayer Delta(1) and interlayer Delta(2) pairing. The anisotropy ratio Delta(1)/Delta(2), determined from the gap function, is close to the c-axis anisotropy ratio of the magnetic exchange coupling J(c)/J(ab) in the parent compound(2). The ubiquitous gap function for all the 3D FSs reveals that pairing is short-ranged and strongly constrains the possible pairing force in the pnictides. A suitable candidate could arise from short-range antiferromagnetic fluctuations. |
| 收录类别 | SCI |
| 资助信息 | Chinese Academy of Sciences; NSF; Ministry of Science and Technology of China; DOE of US; Sino-Swiss Science and Technology Cooperation |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/50132]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Xu, YM,Huang, YB,Cui, XY,et al. Observation of a ubiquitous three-dimensional superconducting gap function in optimally doped Ba0.6K0.4Fe2As2[J]. NATURE PHYSICS,2011,7(3):198. |
| APA | Xu, YM.,Huang, YB.,Cui, XY.,Razzoli, E.,Radovic, M.,...&Ding, H.(2011).Observation of a ubiquitous three-dimensional superconducting gap function in optimally doped Ba0.6K0.4Fe2As2.NATURE PHYSICS,7(3),198. |
| MLA | Xu, YM,et al."Observation of a ubiquitous three-dimensional superconducting gap function in optimally doped Ba0.6K0.4Fe2As2".NATURE PHYSICS 7.3(2011):198. |
入库方式： OAI收割
来源：物理研究所
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