In-gap quasiparticle excitations induced by non-magnetic Cu impurities in Na(Fe0.96Co0.03Cu0.01)As revealed by scanning tunnelling spectroscopy

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	In-gap quasiparticle excitations induced by non-magnetic Cu impurities in Na(Fe0.96Co0.03Cu0.01)As revealed by scanning tunnelling spectroscopy
	Yang, H ; Wang, ZY ; Fang, DL ; Deng, Q ; Wang, QH ; Xiang, YY ; Yang, Y ; Wen, HH
刊名	NATURE COMMUNICATIONS
	2013
卷号	4
ISSN号	2041-1723
通讯作者	Wen, HH (reprint author), Nanjing Univ, Ctr Superconducting Phys & Mat, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China.
中文摘要	The origin of superconductivity in the iron pnictides remains unclear. One suggestion is that superconductivity in these materials has a magnetic origin, which would imply a sign-reversal s(+/-) pairing symmetry. Another suggests it is the result of orbital fluctuations, which would imply a sign-equal s(+/-+/-) pairing symmetry. There is no consensus yet which of these two distinct and contrasting pairing symmetries is the right one in iron pnictide superconductors. Here we explore the nature of the pairing symmetry in the superconducting state of Na(Fe0.97-xCo0.03Cux)As by probing the effect of scattering of Cooper pairs by non-magnetic Cu impurities. Using scanning tunnelling spectroscopy, we identify the in-gap quasi-particle states induced by the Cu impurities, showing signatures of Cooper pair breaking by these non-magnetic impurities-a process that is only consistent with s(+/-) pairing. This experiment provides strong evidence for the s(+/-) pairing.
资助信息	NSF of China; Ministry of Science and Technology of China [2011CBA00102, 2012CB821403, 2010CB923002]; PAPD
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57116]
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	Yang, H,Wang, ZY,Fang, DL,et al. In-gap quasiparticle excitations induced by non-magnetic Cu impurities in Na(Fe0.96Co0.03Cu0.01)As revealed by scanning tunnelling spectroscopy[J]. NATURE COMMUNICATIONS,2013,4.
APA	Yang, H.,Wang, ZY.,Fang, DL.,Deng, Q.,Wang, QH.,...&Wen, HH.(2013).In-gap quasiparticle excitations induced by non-magnetic Cu impurities in Na(Fe0.96Co0.03Cu0.01)As revealed by scanning tunnelling spectroscopy.NATURE COMMUNICATIONS,4.
MLA	Yang, H,et al."In-gap quasiparticle excitations induced by non-magnetic Cu impurities in Na(Fe0.96Co0.03Cu0.01)As revealed by scanning tunnelling spectroscopy".NATURE COMMUNICATIONS 4(2013).