Angle-resolved photoemission studies of the superconducting gap symmetry in Fe-based superconductors

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	Angle-resolved photoemission studies of the superconducting gap symmetry in Fe-based superconductors
	Huang, YB ; Richard, P ; Wang, XP ; Qian, T ; Ding, H
刊名	AIP ADVANCES
	2012
卷号	2 期号:4
关键词	FERMI-SURFACE BA0.6K0.4FE2AS2 SPECTROSCOPY ARPES
ISSN号	2158-3226
通讯作者	Huang, YB: Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	The superconducting gap is the fundamental parameter that characterizes the superconducting state, and its symmetry is a direct consequence of the mechanism responsible for Cooper pairing. Here we discuss about angle-resolved photoemission spectroscopy measurements of the superconducting gap in the Fe-based high-temperature superconductors. We show that the superconducting gap is Fermi surface dependent and nodeless with small anisotropy, or more precisely, a function of the momentum location in the Brillouin zone. We show that while this observation seems inconsistent with weak coupling approaches for superconductivity in these materials, it is well supported by strong coupling models and global superconducting gaps. We also suggest that a smaller lifetime of the superconducting Cooper pairs induced by the momentum dependent interband scattering inherent to these materials could affect the residual density of states at low energies, which is critical for a proper evaluation of the superconducting gap. Copyright 2012 Author(s). This article is distributed under a Creative Commons Attribution 3.0 Unported License. [http://dx.doi.org/10.1063/1.4773460]
收录类别	SCI
资助信息	Chinese Academy of Sciences [2010Y1JB6]; Ministry of Science and Technology of China [2010CB923000, 2011CBA0010]; Nature Science Foundation of China [10974175, 11004232, 11050110422]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/33746]
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	Huang, YB,Richard, P,Wang, XP,et al. Angle-resolved photoemission studies of the superconducting gap symmetry in Fe-based superconductors[J]. AIP ADVANCES,2012,2(4).
APA	Huang, YB,Richard, P,Wang, XP,Qian, T,&Ding, H.(2012).Angle-resolved photoemission studies of the superconducting gap symmetry in Fe-based superconductors.AIP ADVANCES,2(4).
MLA	Huang, YB,et al."Angle-resolved photoemission studies of the superconducting gap symmetry in Fe-based superconductors".AIP ADVANCES 2.4(2012).