Two-dimensional magnetic interactions in LaFeAsO
M. Ramazanoglu,1, 2 J. Lamsal,1, 2 G. S. Tucker,1, 2 J.-Q. Yan,3 S., Calder,3 T. Guidi,4 T. Perring,4 R. W. McCallum,1, 2 T. A. Lograsso,1,2 A., Kreyssig,1,2 A. I. Goldman,1, 2, R. J. McQueeney1, 2 1 (Ames Laboratory) 2
TL;DR
This study reveals that LaFeAsO exhibits highly two-dimensional magnetic interactions with extremely weak interlayer coupling, which may influence its superconducting properties.
Contribution
It provides the first detailed inelastic neutron scattering analysis showing the two-dimensional nature of magnetic interactions in LaFeAsO.
Findings
Interlayer exchange ratio less than ~10^{-4}
Spin wave velocities similar to AFe2As2 materials
Weak 3-D interactions may limit superconducting T_c
Abstract
Inelastic neutron scattering measurements demonstrate that the magnetic interactions in antiferromagnetic LaFeAsO are two-dimensional. Spin wave velocities within the Fe layer and the magnitude of the spin gap are similar to the \textit{A}FeAs based materials. However, the ratio of interlayer and intralayer exchange is found to be less than in LaFeAsO, very similar to the cuprates, and 100 times smaller than that found in \textit{A}FeAs compounds. The results suggest that the effective dimensionality of the magnetic system is highly variable in the parent compounds of the iron arsenides and weak 3-D interactions may limit the maximum attainable superconducting .
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Taxonomy
TopicsIron-based superconductors research