Two-dimensional magnetic interactions in LaFeAsO

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}Fe${}_2$As${}_2$ based materials. However, the ratio of interlayer and intralayer exchange is found to be less than $\sim 10^{-4}$ in LaFeAsO, very similar to the cuprates, and $\sim$ 100 times smaller than that found in \textit{A}Fe${}_2$As${}_2$ 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 $T_c$.

4 pages 4 figures

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• Neutron spin resonance in a quasi-two-dimensional iron-based superconductor
• Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors
• Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$: Evidence for a sharp enhancement of spin fluctuations by nematic order
• Soft striped magnetic fluctuations competing with superconductivity in Fe_{1+x}Te
• Spin reorientation and Ce-Mn coupling in antiferromagnetic oxypnictide CeMnAsO
• Local and collective magnetism of EuFe${}_2$As${}_2$
• Presence of magnetic excitations in SmFeAsO
• Crossover from spin-waves to diffusive spin excitations in underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Magnetic excitations and anomalous spin wave broadening in multiferroic FeV2O4
• Spatial competition of the ground states in 1111 iron pnictides
• Unexpected Enhancement of Three-Dimensional Low-Energy Spin Correlations in Quasi-Two-Dimensional Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ System at High Temperature
• Ferromagnetic inter-layer coupling in FeSe${}_{1-x}$S${}_x$ superconductors revealed by inelastic neutron scattering
• Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field