November 2008

Journal

Anisotropic three-dimensional magnetism in CaFe2As2

By:
McQueeney, R.; Diallo, S. O.; Antropov, V. P.; Samolyuk, G, D,; Broholm, C.; Ni, N.; Yethiraj, M.; Zarestly, J.; Pulikkotil, J. J.; Kreyssig, A.; Lumsden, Mark D; Harmon, B.; Canfield, P.; Goldman, A. I.
Journal Name:
Physical Review Letters
Page Number:
227205
Volume:
101
Issue Number:
22
Publication Date:
November 2008
View DOI Listing:
https://doi.org/10.1103/PhysRevLett.101.227205

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.


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