Anisotropic three-dimensional magnetism in CaFe2As2

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Title: Anisotropic three-dimensional magnetism in CaFe2As2
Author: McQueeney, R.J.; Diallo, S.O.; Antropov, V.P.; Samolyuk, G.D.; Broholm, C.; Ni, N.; Nandi, S.; Yethiraj, M.; Zaretsky, J.L.; Pulikkotil, J.J.; Kreyssig, A.; Lumsden, M.D.; Harmon, B.N.; Canfield, P.C.
Abstract: Inelastic neutron scattering measurements of the magnetic excitations in CaFe2As2 indicate that the spin wave velocity in the Fe layers is exceptionally large and similar in magnitude to the cuprates. However, the spin wave velocity perpendicular to the layers is at least half as large that in the layer, so that the magnetism is more appropriately categorized as anisotropic three-dimensional, in contrast to the two-dimensional cuprates. Exchange constants derived from band structure calculations predict spin wave velocities that are consistent with the experimental data.
URI: http://jhir.library.jhu.edu/handle/1774.2/33735
Date: 2008-11-28
Citation: Physical Review Letters 28 Nov. 2008, vol.101, no.22, 227205 (4 pp.)
Subject: neutron diffraction
spin dynamics
spin waves
magnetic superconductors
iron alloys
exchange interactions (electron)
calcium alloys
atomic force microscopy
anisotropic three-dimensional magnetism
magnetic excitations
inelastic neutron scattering
spin wave velocity
arsenic alloys
antiferromagnetism
ab initio calculations
two-dimensional cuprates
exchange constants
band structure calculations
CaFe2As2

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