Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As2
文献类型：期刊论文
| 作者 | Liu, MS ; Lester, C ; Kulda, J ; Lu, XY ; Luo, HQ ; Wang, M ; Hayden, SM ; Dai, PC |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2012 |
| 卷号 | 85期号:21 |
| 关键词 | YBA2CU3O7 RESONANCE SPECTRA |
| ISSN号 | 1098-0121 |
| 通讯作者 | Liu, MS (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. |
| 中文摘要 | We use polarized inelastic neutron scattering to study low-energy spin excitations and their spatial anisotropy in electron-overdoped superconducting BaFe1.85Ni0.15As2 (T-c = 14 K). In the normal state, the imaginary part of the dynamic susceptibility chi '' (Q,omega) at the antiferromagnetic wave vector Q = (0.5,0.5,1) increases linearly with energy for E <= 13 meV. Upon entering the superconducting state, a spin gap opens below E approximate to 3 meV and a broad neutron spin resonance appears at E approximate to 7 meV. Our careful neutron polarization analysis reveals that chi ''(Q,omega) is isotropic for the in-plane and out-of-plane components in both the normal and superconducting states. A comparison of these results with those of undoped BaFe2As2 and optimally electron-doped BaFe1.9Ni0.1As2 (T-c = 20 K) suggests that the spin anisotropy observed in BaFe1.9Ni0.1As2 is likely due to its proximity to the undoped BaFe2As2. Therefore, the neutron spin resonance is mostly isotropic in the optimal and electron overdoped iron pnictides, consistent with a singlet to triplet excitation and isotropic paramagnetic scattering. |
| 收录类别 | SCI |
| 资助信息 | MOST of China 973 programs [2012CB821400, 2011CBA00110]; [NSFC-11004233]; [NSF-DMR-1063866] |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/51117]  |
| 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,Lester, C,Kulda, J,et al. Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As2[J]. PHYSICAL REVIEW B,2012,85(21). |
| APA | Liu, MS.,Lester, C.,Kulda, J.,Lu, XY.,Luo, HQ.,...&Dai, PC.(2012).Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As2.PHYSICAL REVIEW B,85(21). |
| MLA | Liu, MS,et al."Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As2".PHYSICAL REVIEW B 85.21(2012). |
入库方式： OAI收割
来源：物理研究所
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