Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe2-xNixAs2

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	Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe2-xNixAs2
	Wang, MY ; Luo, HQ ; Zhao, J ; Zhang, CL ; Wang, M ; Marty, K ; Chi, SX ; Lynn, JW ; Schneidewind, A ; Li, SL ; Dai, PC
刊名	PHYSICAL REVIEW B
	2010
卷号	81 期号:17
关键词	NEUTRON-SCATTERING PAIRING SYMMETRY
ISSN号	1098-0121
通讯作者	Wang, MY: Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
中文摘要	We use elastic and inelastic neutron scattering to systematically investigate the evolution of the low-energy spin excitations of the iron arsenide superconductor BaFe2-xNixAs2 as a function of nickel doping x. In the undoped state, BaFe2As2 exhibits a tetragonal-to-orthorhombic structural phase transition and simultaneously develops a collinear antiferromagnetic (AF) order below T-N=143 K. Upon electron doping of x=0.075 to induce bulk superconductivity with T-c=12.2 K, the AF ordering temperature reduces to T-N approximate to 58 K. We show that the appearance of bulk superconductivity in BaFe1.925Ni0.075As2 coincides with a dispersive neutron spin resonance in the spin excitation spectra and a reduction in the static ordered moment. For optimally doped BaFe1.9Ni0.1As2 (T-c=20 K) and overdoped BaFe(1.85)Ni(0.15)As2 (T-c=14 K) superconductors, the static AF long-range order is completely suppressed and the spin excitation spectra are dominated by a resonance and spin gap at lower energies. We determine the electron-doping dependence of the neutron spin resonance and spin gap energies and demonstrate that the three-dimensional nature of the resonance survives into the overdoped regime. If spin excitations are important for superconductivity, these results would suggest that the three-dimensional characters of the electronic superconducting gaps are prevalent throughout the phase diagram and may be critical for superconductivity in these materials.
收录类别	SCI
资助信息	U.S. NSF [DMR-0756568]; U.S. DOE, Division of Scientific User Facilities; U.S. DOE BES [DE-FG02-05ER46202]; Chinese Academy of Sciences and 973 Program [2010CB833102]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/37132]
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	Wang, MY,Luo, HQ,Zhao, J,et al. Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe2-xNixAs2[J]. PHYSICAL REVIEW B,2010,81(17).
APA	Wang, MY.,Luo, HQ.,Zhao, J.,Zhang, CL.,Wang, M.,...&Dai, PC.(2010).Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe2-xNixAs2.PHYSICAL REVIEW B,81(17).
MLA	Wang, MY,et al."Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe2-xNixAs2".PHYSICAL REVIEW B 81.17(2010).