Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s(+/-) Pairing
文献类型：期刊论文
| 作者 | 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
 |
| 出版日期 | 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 |
| 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). |
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来源：物理研究所
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