Itinerant Magnetic Excitations in Antiferromagnetic CaFe2As2

被引：148

作者：

Diallo, S. O. ^{[1
]}

Antropov, V. P. ^{[1
]}

Perring, T. G. ^{[2
,3
]}

Broholm, C. ^{[4
]}

Pulikkotil, J. J. ^{[1
]}

Ni, N. ^{[1
,5
]}

Bud'ko, S. L. ^{[1
,5
]}

Canfield, P. C. ^{[1
,5
]}

Kreyssig, A. ^{[1
,2
]}

Goldman, A. I. ^{[1
,5
]}

McQueeney, R. J. ^{[1
,5
]}

机构：

[1] US DOE, Ames Lab, Ames, IA 50011 USA

[2] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[3] UCL, Dept Phys, London WC1E 6BT, England

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[5] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.102.187206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutron scattering measurements of the magnetic excitations in single crystals of antiferromagnetic CaFe2As2 reveal steeply dispersive and well-defined spin waves up to an energy of similar to 100 meV. Magnetic excitations above 100 meV and up to the maximum energy of 200 meV are however broader in energy and momentum than the experimental resolution. While the low energy modes can be fit to a Heisenberg model, the total spectrum cannot be described as arising from excitations of a local moment system. Ab initio calculations of the dynamic magnetic susceptibility suggest that the high energy behavior is dominated by the damping of spin waves by particle-hole excitations.

引用

页数：4

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