Anisotropic three-dimensional magnetism in CaFe2As2
R. J. McQueeney, S. O. Diallo, V. P. Antropov, G. Samolyuk, C., Broholm, N. Ni, S. Nandi, M. Yethiraj, J. L. Zarestky, J. J. Pulikkotil, A., Kreyssig, M. D. Lumsden, B. N. Harmon, P. C. Canfield, A. I. Goldman
TL;DR
This paper investigates the anisotropic three-dimensional magnetic properties of CaFe2As2 using inelastic neutron scattering and band structure calculations, revealing strong in-plane interactions and weaker interlayer coupling.
Contribution
It provides the first detailed characterization of the anisotropic 3D magnetism in CaFe2As2, highlighting the differences from cuprates and confirming experimental results with theoretical calculations.
Findings
In-plane magnetic exchange interactions are exceptionally large.
Interlayer exchange is about 10% of in-plane coupling.
Magnetism is best described as anisotropic three-dimensional.
Abstract
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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