Temperature dependence of the paramagnetic spin excitations in BaFe2As2

被引：25
作者：
Harriger, Leland W. [1 ,2 ]
Liu, Mengshu [1 ]
Luo, Huiqian [3 ]
Ewings, R. A. [4 ]
Frost, C. D. [4 ]
Perring, T. G. [4 ]
Dai, Pengcheng [1 ,3 ]
机构：
[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[2] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
来源：
PHYSICAL REVIEW B | 2012年 / 86卷 / 14期
基金：
美国国家科学基金会;
关键词：
MAGNETIC EXCITATIONS; IRON; SUPERCONDUCTIVITY; SCATTERING; TRANSITION; ANISOTROPY;
D O I：
10.1103/PhysRevB.86.140403
中图分类号：
T [工业技术];
学科分类号：
08 ;
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.
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页数：6
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