In-plane spin excitation anisotropy in the paramagnetic state of NaFeAs

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	In-plane spin excitation anisotropy in the paramagnetic state of NaFeAs
	Song, Y ; Regnault, LP ; Zhang, CL ; Tan, GT ; Carr, SV ; Chi, SX ; Christianson, AD ; Xiang, T ; Dai, PC
刊名	PHYSICAL REVIEW B
	2013
卷号	88 期号:13
ISSN号	1098-0121
通讯作者	Song, Y (reprint author), Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA.
中文摘要	We use unpolarized and polarized inelastic neutron scattering to study low-energy spin excitations in NaFeAs, which exhibits a tetragonal-to-orthorhombic lattice distortion at T-s approximate to 58 K followed by a collinear antiferromagnetic (AF) order below T-N approximate to 45 K. In the AF ordered state (T < T-N), spin waves are entirely c-axis polarized below similar to 10 meV, exhibiting a gap of similar to 4 meV at the AF zone center and disperse to similar to 7 meV near the c-axis AF zone boundary. On warming to the paramagnetic state with orthorhombic lattice distortion (T-N < T < T-s), spin excitations become anisotropic within the FeAs plane. Upon further warming to the paramagnetic tetragonal state (T > T-s), spin excitations become more isotropic. Since similar magnetic anisotropy is also observed in the paramagnetic tetragonal phase of superconducting BaFe1.904Ni0.096As2, our results suggest that the spin excitation anisotropy in superconducting iron pnictides originates from similar anisotropy already present in their parent compounds.
资助信息	US DOE, BES [DE-FG02-05ER46202]; MOST (973 Project) [2012CB82400]; Scientific User Facilities Division, BES, US DOE
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57120]
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	Song, Y,Regnault, LP,Zhang, CL,et al. In-plane spin excitation anisotropy in the paramagnetic state of NaFeAs[J]. PHYSICAL REVIEW B,2013,88(13).
APA	Song, Y.,Regnault, LP.,Zhang, CL.,Tan, GT.,Carr, SV.,...&Dai, PC.(2013).In-plane spin excitation anisotropy in the paramagnetic state of NaFeAs.PHYSICAL REVIEW B,88(13).
MLA	Song, Y,et al."In-plane spin excitation anisotropy in the paramagnetic state of NaFeAs".PHYSICAL REVIEW B 88.13(2013).