Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s(+/-) Pairing

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	Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s(+/-) Pairing
	Zhang, P ; Richard, P ; Qian, T ; Shi, X ; Ma, J ; Zeng, LK ; Wang, XP ; Rienks, E ; Zhang, CL ; Dai, PC ; You, YZ ; Weng, ZY ; Wu, XX ; Hu, JP ; Ding, H
刊名	PHYSICAL REVIEW X
	2014
卷号	4 期号:3
ISSN号	2160-3308
通讯作者	Richard, P (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	We report the observation by angle-resolved photoemission spectroscopy of an impurity state located inside the superconducting gap of Ba0.6K0.4Fe2As2 and vanishing above the superconducting critical temperature, for which the spectral weight is confined in momentum space near the Fermi wave-vector positions. We demonstrate, supported by theoretical simulations, that this in-gap state originates from weak scattering between bands with opposite sign of the superconducting-gap phase. This weak scattering, likely due to off-plane nonmagnetic (Ba, K) disorder, occurs mostly among neighboring Fermi surfaces, suggesting that the superconducting-gap phase changes sign within holelike (and electronlike) bands. Our results impose severe restrictions on the models promoted to explain high-temperature superconductivity in these materials.
资助信息	CAS [2010Y1JB6]; MOST [2010CB923000, 2011CBA001000, 2011CBA00102, 2012CB821403, 2013CB921703]; NSFC from China [11004232, 11034011/A0402, 11234014, 11274362]; U.S. DOE; BES [DE-FG02-05ER46202]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59601]
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	Zhang, P,Richard, P,Qian, T,et al. Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s(+/-) Pairing[J]. PHYSICAL REVIEW X,2014,4(3).
APA	Zhang, P.,Richard, P.,Qian, T.,Shi, X.,Ma, J.,...&Ding, H.(2014).Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s(+/-) Pairing.PHYSICAL REVIEW X,4(3).
MLA	Zhang, P,et al."Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s(+/-) Pairing".PHYSICAL REVIEW X 4.3(2014).