Spin waves and magnetic exchange interactions in CaFe2As2

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	Spin waves and magnetic exchange interactions in CaFe2As2
	Zhao, J ; Adroja, DT ; Yao, DX ; Bewley, R ; Li, SL ; Wang, XF ; Wu, G ; Chen, XH ; Hu, JP ; Dai, PC
刊名	NATURE PHYSICS
	2009
卷号	5 期号:8 页码:555
关键词	HIGH-TEMPERATURE SUPERCONDUCTIVITY IRON-PNICTIDES
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	Antiferromagnetism is relevant to high-temperature (high-T-c) superconductivity because copper oxide and iron arsenide superconductors arise from electron- or hole-doping of their antiferromagnetic parent compounds(1-6). There are two broad classes of explanation for antiferromagnetism: in the 'local moment' picture, appropriate for the insulating copper oxides(1), antiferromagnetic interactions are well described by a Heisenberg Hamiltonian(7,8); whereas in the 'itinerant model', suitable for metallic chromium, antiferromagnetic order arises from quasiparticle excitations of a nested Fermi surface(9,10). There has been contradictory evidence regarding the microscopic origin of the antiferromagnetic order in iron arsenide materials(5,6), with some favouring a localized picture(11-15) and others supporting an itinerant point of view(16-20). More importantly, there has not even been agreement about the simplest effective ground-state Hamiltonian necessary to describe the antiferromagnetic order(21-25). Here, we use inelastic neutron scattering to map spin-wave excitations in CaFe2As2 (refs 26, 27), a parent compound of the iron arsenide family of superconductors. We find that the spin waves in the entire Brillouin zone can be described by an effective three-dimensional local-moment Heisenberg Hamiltonian, but the large in-plane anisotropy cannot. Therefore, magnetism in the parent compounds of iron arsenide superconductors is neither purely local nor purely itinerant, rather it is a complicated mix of the two.
收录类别	SCI
资助信息	US National Science Foundation [DMR-0756568]; US Department of Energy; Division of Materials Science; DOE [DE-FG02-05ER46202]; Chinese Academy of Sciences; Natural Science Foundation of China, the Chinese Academy of Sciences and the Ministry of Science and Technology of China
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/311004/52902]
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	Zhao, J,Adroja, DT,Yao, DX,et al. Spin waves and magnetic exchange interactions in CaFe2As2[J]. NATURE PHYSICS,2009,5(8):555.
APA	Zhao, J.,Adroja, DT.,Yao, DX.,Bewley, R.,Li, SL.,...&Dai, PC.(2009).Spin waves and magnetic exchange interactions in CaFe2As2.NATURE PHYSICS,5(8),555.
MLA	Zhao, J,et al."Spin waves and magnetic exchange interactions in CaFe2As2".NATURE PHYSICS 5.8(2009):555.