Magnetic anisotropy in hole-doped superconducting Ba0.67K0.33Fe2As2 probed by polarized inelastic neutron scattering

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	Magnetic anisotropy in hole-doped superconducting Ba0.67K0.33Fe2As2 probed by polarized inelastic neutron scattering
	Zhang, CL ; Liu, MS ; Su, YX ; Regnault, LP ; Wang, M ; Tan, GT ; Bruckel, T ; Egami, T ; Dai, PC
刊名	PHYSICAL REVIEW B
	2013
卷号	87 期号:8
ISSN号	1098-0121
通讯作者	Zhang, CL (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
中文摘要	We use polarized inelastic neutron scattering ( INS) to study spin excitations of optimally hole-doped superconductor Ba0.67K0.33Fe2As2 (T-c = 38 K). In the normal state, the imaginary part of the dynamic susceptibility, chi ''(Q,omega), shows magnetic anisotropy for energies below similar to 7 meV with c-axis polarized spin excitations larger than that of the in-plane component. Upon entering into the superconducting state, previous unpolarized INS experiments have shown that spin gaps at similar to 5 and 0.75 meV open at wave vectors Q = (0.5,0.5,0) and (0.5,0.5,1), respectively, with a broad neutron spin resonance at E-r = 15 meV. Our neutron polarization analysis reveals that the large difference in spin gaps is purely due to different spin gaps in the c axis and in-plane polarized spin excitations, resulting in a resonance with different energy widths for the c-axis and in-plane spin excitations. The observation of spin anisotropy in both optimally electron- and hole-doped BaFe2As2 is due to their proximity to the AF ordered BaFe2As2 where spin anisotropy exists below T-N. DOI: 10.1103/PhysRevB.87.081101
资助信息	US DOE BES [DE-FG02-05ER46202]; US DOE BES through the EPSCoR grant [DE-FG02-08ER46528]; MOST of China 973 program [2012CB821400]
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/311004/57184]
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	Zhang, CL,Liu, MS,Su, YX,et al. Magnetic anisotropy in hole-doped superconducting Ba0.67K0.33Fe2As2 probed by polarized inelastic neutron scattering[J]. PHYSICAL REVIEW B,2013,87(8).
APA	Zhang, CL.,Liu, MS.,Su, YX.,Regnault, LP.,Wang, M.,...&Dai, PC.(2013).Magnetic anisotropy in hole-doped superconducting Ba0.67K0.33Fe2As2 probed by polarized inelastic neutron scattering.PHYSICAL REVIEW B,87(8).
MLA	Zhang, CL,et al."Magnetic anisotropy in hole-doped superconducting Ba0.67K0.33Fe2As2 probed by polarized inelastic neutron scattering".PHYSICAL REVIEW B 87.8(2013).