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Temperature dependence of the paramagnetic spin excitations in BaFe2As2
Harriger, LW ; Liu, MS ; Luo, HQ ; Ewings, RA ; Frost, CD ; Perring, TG ; Dai, PC
刊名PHYSICAL REVIEW B
2012
卷号86期号:14
关键词MAGNETIC EXCITATIONS IRON SUPERCONDUCTIVITY SCATTERING TRANSITION ANISOTROPY
ISSN号1098-0121
通讯作者Harriger, LW (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
中文摘要We use inelastic neutron scattering to study temperature dependence of the paramagnetic spin excitations in iron pnictide BaFe2As2 throughout the Brillouin zone. In contrast to a conventional local moment Heisenberg system, where paramagnetic spin excitations are expected to have a Lorentzian function centered at zero energy transfer, the high-energy (h(omega) > 100 meV) paramagnetic spin excitations in BaFe2As2 exhibit spin-wave-like features up to at least 290 K (T = 2.1T(N)). Furthermore, we find that the sizes of the fluctuating magnetic moments (m(2)) approximate to 3.6 mu(2)(B) per Fe are essentially temperature independent from the antiferromagnetic ordered state at 0.05T(N) to 2.1T(N), which differs considerably from the temperature dependent fluctuating moment observed in the iron chalcogenide Fe1.1Te [Zaliznyak et al., Phys. Rev. Lett. 107, 216403 (2011)]. These results suggest unconventional magnetism and strong electron correlation effects in BaFe2As2.
收录类别SCI
资助信息US NSF [DMR-1063866]; MOST of China 973 programs [2012CB821400, 2011CBA00110]; [NSFC-11004233]
语种英语
公开日期2013-09-23
内容类型期刊论文
源URL[http://ir.iphy.ac.cn/handle/311004/44778]  
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
Harriger, LW,Liu, MS,Luo, HQ,et al. Temperature dependence of the paramagnetic spin excitations in BaFe2As2[J]. PHYSICAL REVIEW B,2012,86(14).
APA Harriger, LW.,Liu, MS.,Luo, HQ.,Ewings, RA.,Frost, CD.,...&Dai, PC.(2012).Temperature dependence of the paramagnetic spin excitations in BaFe2As2.PHYSICAL REVIEW B,86(14).
MLA Harriger, LW,et al."Temperature dependence of the paramagnetic spin excitations in BaFe2As2".PHYSICAL REVIEW B 86.14(2012).
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