Anisotropic three-dimensional magnetism in CaFe2As2
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Date
2008-11-28
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
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. © 2008, American Physical Society
Description
Keywords
Superconductivity, Magnetism, Anisotropy, Inelastic scattering, Iron, Calcium
Citation
McQueeney, R. J., Diallo, S. O., Antropov, V. P., Samolyuk, G. D., Broholm, C., Ni, N., Nandi, S.,
Yethiraj, M., Zarestky, J. L., Pulikkotil, J. J.,
Kreyssig, A., Lumsden, M. D., Harmon, B. N., Canfield, P. C., & Goldman, A. I.(2008). Anisotropic three-dimensional magnetism in CaFe2As2. Physical Review Letters, 101(22), 227205. doi:10.1103/PhysRevLett.101.227205