Anisotropic three-dimensional magnetism in CaFe2As2

Details Anisotropic three-dimensional magnetism in CaFe2As2 Anisotropic three-dimensional magnetism in CaFe2As2

2008-09-08

arxiv.org/abs/0809.1410v1

Physics

Condensed Matter

Superconductivity

17 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.227205

Inelastic neutron scattering measurements on the low energy spin waves in CaFe2As2 show that the magnetic exchange interactions in the Fe layers are exceptionally large and similar to the cuprates. However, the exchange between layers is ~10% of the coupling in the layers and the magnetism is more appropriately categorized as anisotropic three-dimensional, in contrast to the two-dimensional cuprates. Band structure calculations of the spin dynamics and magnetic exchange interactions are in good agreement with the experimental data.

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