Experimental elucidation of the origin of the 'double spin resonances' in Ba(Fe1-xCox)(2)As-2

doi:10.1103/PhysRevB.93.205149

	Experimental elucidation of the origin of the 'double spin resonances' in Ba(Fe1-xCox)(2)As-2
	Lu, DH; Li, XD; Bourret-Courchesne, E; Dai, PC; Lee, DH; Maier, TA; Birgeneau, RJ; Li XD(李晓东); Valdivia, P; Kim, MG
刊名	PHYSICAL REVIEW B
	2016
卷号	93 期号:20 页码:205149
ISSN号	2469-9950
DOI	10.1103/PhysRevB.93.205149
文献子类	Article
英文摘要	We report a combined study of the spin resonances and superconducting gaps for underdoped (T-c = 19 K), optimally doped (T-c = 25 K), and overdoped (T-c = 19 K) Ba(Fe1-xCox)(2)As-2 single crystalswith inelastic neutron scattering and angle resolved photoemission spectroscopy. We find a quasi-two-dimensional spin resonance whose energy scales with the superconducting gap in all three compounds. In addition, anisotropic low energy spin excitation enhancements in the superconducting state have been deduced and characterized for the under and optimally doped compounds. Our data suggest that the quasi-two-dimensional spin resonance is a spin exciton that corresponds to the spin singlet-triplet excitations of the itinerant electrons. However, the intensity enhancements of the anisotropic spin excitations are dominated by the out-of-plane spin excitations of the ordered moments due to the suppression of damping in the superconducting state. Hence we offer an interpretation of the double energy scales differing from previous interpretations based on anisotropic superconducting energy gaps and systematically explain the doping-dependent trend across the phase diagram.
电子版国际标准刊号	2469-9969
语种	英语
WOS记录号	WOS:000376638700003
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/287047]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Lu, DH,Li, XD,Bourret-Courchesne, E,et al. Experimental elucidation of the origin of the 'double spin resonances' in Ba(Fe1-xCox)(2)As-2[J]. PHYSICAL REVIEW B,2016,93(20):205149.
APA	Lu, DH.,Li, XD.,Bourret-Courchesne, E.,Dai, PC.,Lee, DH.,...&孙华蕾.(2016).Experimental elucidation of the origin of the 'double spin resonances' in Ba(Fe1-xCox)(2)As-2.PHYSICAL REVIEW B,93(20),205149.
MLA	Lu, DH,et al."Experimental elucidation of the origin of the 'double spin resonances' in Ba(Fe1-xCox)(2)As-2".PHYSICAL REVIEW B 93.20(2016):205149.