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
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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. |
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