Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.227205
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Funding
- U. S. Department of Energy Office of Science [DE-AC02-07CH11358, DE-FG02-08ER46544]
- Scientific User Facilities Division
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences
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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.
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