Distinguishing s(+/-) and s(++) electron pairing symmetries by neutron spin resonance in superconducting NaFe0.935Co0.045As

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	Distinguishing s(+/-) and s(++) electron pairing symmetries by neutron spin resonance in superconducting NaFe0.935Co0.045As
	Zhang, CL ; Li, HF ; Song, Y ; Su, YX ; Tan, GT ; Netherton, T ; Redding, C ; Carr, SV ; Sobolev, O ; Schneidewind, A ; Faulhaber, E ; Harriger, LW ; Li, SL ; Lu, XY ; Yao, DX ; Das, T ; Balatsky, AV ; Bruckel, T ; Lynn, JW ; Dai, PC
刊名	PHYSICAL REVIEW B
	2013
卷号	88 期号:6
ISSN号	1098-0121
通讯作者	Zhang, CL (reprint author), Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA.
中文摘要	A determination of the superconducting (SC) electron pairing symmetry forms the basis for establishing a microscopic mechanism for superconductivity. For iron pnictide superconductors, the s(+/-)-pairing symmetry theory predicts the presence of a sharp neutron spin resonance at an energy below the sum of hole and electron SC gap energies (E <= 2 Delta) below T-c. On the other hand, the s(++)-pairing symmetry expects a broad spin excitation enhancement at an energy above 2 Delta below Tc. Although the resonance has been observed in iron pnictide superconductors at an energy below 2 Delta consistent with the s(+/-)-pairing symmetry, the mode has also been interpreted as arising from the s++-pairing symmetry with E <= 2 Delta due to its broad energy width and the large uncertainty in determining the SC gaps. Here we use inelastic neutron scattering to reveal a sharp resonance at E = 7 meV in SC NaFe0.935Co0.045As (T-c = 18 K). On warming towards Tc, the mode energy hardly softens while its energy width increases rapidly. By comparing with calculated spin-excitation spectra within the s(+/-) and s++-pairing symmetries, we conclude that the ground-state resonance in NaFe0.935Co0.045As is only consistent with the s(+/-) pairing, and is inconsistent with the s(++)-pairing symmetry.
资助信息	US DOE, BES [DE-FG02-05ER46202]; MOST (973 Project) [2012CB82400]; BMBF [05K10PA3]; NNSA of the US DOE [DE-AC52-06NA25396]; [NSFC-11074310]; [RFDPHE-20110171110026]; [NCET-11-0547]
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/311004/56896]
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, CL,Li, HF,Song, Y,et al. Distinguishing s(+/-) and s(++) electron pairing symmetries by neutron spin resonance in superconducting NaFe0.935Co0.045As[J]. PHYSICAL REVIEW B,2013,88(6).
APA	Zhang, CL.,Li, HF.,Song, Y.,Su, YX.,Tan, GT.,...&Dai, PC.(2013).Distinguishing s(+/-) and s(++) electron pairing symmetries by neutron spin resonance in superconducting NaFe0.935Co0.045As.PHYSICAL REVIEW B,88(6).
MLA	Zhang, CL,et al."Distinguishing s(+/-) and s(++) electron pairing symmetries by neutron spin resonance in superconducting NaFe0.935Co0.045As".PHYSICAL REVIEW B 88.6(2013).