Phys. Rev. Lett. 101, 227205 (2008) [4 pages]Anisotropic Three-Dimensional Magnetism in CaFe2As2Received 10 September 2008; published 26 November 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.227205
DOI:
10.1103/PhysRevLett.101.227205
PACS:
75.30.Ds, 74.72.−h, 75.30.Et, 78.70.Nx
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