Nature of magnetic excitations in superconducting BaFe1.9Ni0.1As2

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	Nature of magnetic excitations in superconducting BaFe1.9Ni0.1As2
	Liu, MS ; Harriger, LW ; Luo, HQ ; Wang, M ; Ewings, RA ; Guidi, T ; Park, H ; Haule, K ; Kotliar, G ; Hayden, SM ; Dai, PC
刊名	NATURE PHYSICS
	2012
卷号	8 期号:5 页码:376
关键词	HIGH-TEMPERATURE SUPERCONDUCTIVITY
ISSN号	1745-2473
通讯作者	Dai, PC (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
中文摘要	Since the discovery of the metallic antiferromagnetic (AF) ground state near superconductivity in iron pnictide superconductors(1-3), a central question has been whether magnetism in these materials arises from weakly correlated electrons(4,5), as in the case of spin density wave in pure chromium(6), requires strong electron correlations(7), or can even be described in terms of localized electrons(8,9) such as the AF insulating state of copper oxides(10). Here we use inelastic neutron scattering to determine the absolute intensity of the magnetic excitations throughout the Brillouin zone in electron-doped superconducting BaFe1.9Ni0.1As2 (T-c = 20 K), which allows us to obtain the size of the fluctuating magnetic moment < m(2)>, and its energy distribution(11,12). We find that superconducting BaFe1.9Ni0.1As2 and AF BaFe2As2 (ref. 13) both have fluctuating magnetic moments < m(2)> approximate to 3.2 mu(2)(B) per Fe(Ni), which are similar to those found in the AF insulating copper oxides(14,15). The common theme in both classes of high-temperature superconductors is that magnetic excitations have partly localized character, thus showing the importance of strong correlations for high-temperature superconductivity(16).
收录类别	SCI
资助信息	US National Science Foundation (NSF) [DMR-1063866, OISE-0968226]; Ministry of Science and Technology China [2012CB821400, 2011CBA00110]; National Natural Science Foundation of China [NSFC-11004233]; Department of Energy (DOE) [BES DE-FG02-99ER45761]; American Chemical Society [48802]; Alfred P. Sloan foundation
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/49710]
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	Liu, MS,Harriger, LW,Luo, HQ,et al. Nature of magnetic excitations in superconducting BaFe1.9Ni0.1As2[J]. NATURE PHYSICS,2012,8(5):376.
APA	Liu, MS.,Harriger, LW.,Luo, HQ.,Wang, M.,Ewings, RA.,...&Dai, PC.(2012).Nature of magnetic excitations in superconducting BaFe1.9Ni0.1As2.NATURE PHYSICS,8(5),376.
MLA	Liu, MS,et al."Nature of magnetic excitations in superconducting BaFe1.9Ni0.1As2".NATURE PHYSICS 8.5(2012):376.