Anisotropic Three-Dimensional Magnetism in CaFe2As2

TitleAnisotropic Three-Dimensional Magnetism in CaFe2As2
Publication TypeJournal Article
Year of Publication2008
AuthorsMcQueeney RJ, Diallo SO, Antropov VP, Samolyuk GD, Broholm C, Ni N, Nandi S, Yethiraj M, Zarestky JL, Pulikkotil JJ, Kreyssig A, Lumsden MD, Harmon BN, Canfield PC, Goldman AI
Journal TitlePhysical Review Letters
Volume101
Pages227205
Date Published11/01
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000261214400058
Keywordsfe, superconductivity
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.

DOI10.1103/PhysRevLett.101.227205
Alternate JournalPhys. Rev. Lett.