Low Energy Spin Waves and Magnetic Interactions in SrFe(2)As(2)
文献类型：期刊论文
| 作者 | Zhao, J ; Yao, DX ; Li, SL ; Hong, T ; Chen, Y ; Chang, S ; Ratcliff, W ; Lynn, JW ; Mook, HA ; Chen, GF ; Luo, JL ; Wang, NL ; Carlson, EW ; Hu, JP ; Dai, PC |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2008 |
| 卷号 | 101期号:16 |
| ISSN号 | 0031-9007 |
| 关键词 | SUPERCONDUCTIVITY |
| 通讯作者 | Zhao, J: Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. |
| 中文摘要 | We report inelastic neutron scattering studies of magnetic excitations in antiferromagnetically ordered SrFe(2)As(2) (T(N)=200-220 K), the parent compound of the FeAs-based superconductors. At low temperatures (T=7 K), the magnetic spectrum S(Q,h omega) consists of a Bragg peak at the elastic position (h omega=0 meV), a spin gap (Delta <= 6.5 meV), and sharp spin-wave excitations at higher energies. Based on the observed dispersion relation, we estimate the effective magnetic exchange coupling using a Heisenberg model. On warming across T(N), the low-temperature spin gap rapidly closes, with weak critical scattering and spin-spin correlations in the paramagnetic state. The antiferromagnetic order in SrFe(2)As(2) is therefore consistent with a first order phase transition, similar to the structural lattice distortion. |
| 资助信息 | U.S. NSF [DMR-0756568, PHY-0603759, DMR-0804748]; U.S. DOE, BES [DE-FG02-05ER46202]; Division of Scientific User Facilities; Research Corporation; NSF of China; CAS ITSNEM; Ministry of Science and Technology of China |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-18 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/40991]  |
| 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,Yao, DX,Li, SL,et al. Low Energy Spin Waves and Magnetic Interactions in SrFe(2)As(2)[J]. PHYSICAL REVIEW LETTERS,2008,101(16). |
| APA | Zhao, J.,Yao, DX.,Li, SL.,Hong, T.,Chen, Y.,...&Dai, PC.(2008).Low Energy Spin Waves and Magnetic Interactions in SrFe(2)As(2).PHYSICAL REVIEW LETTERS,101(16). |
| MLA | Zhao, J,et al."Low Energy Spin Waves and Magnetic Interactions in SrFe(2)As(2)".PHYSICAL REVIEW LETTERS 101.16(2008). |
入库方式： OAI收割
来源：物理研究所
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