Presence of magnetic excitations in SmFeAsO

Abstract

We measured dispersive spin excitations in $\mathrm{SmFeAsO}$, parent compound of $\mathrm{SmFeAs}{\mathrm{O}}_{\text{1-x}}{\mathrm{F}}_{\text{x}}$ one of the highest temperature superconductors of Fe pnictides (T${}_{\text{C}}\approx$55~K). We determine the magnetic excitations to disperse with a bandwidth energy of ca 170 meV at (0.47, 0) and (0.34, 0.34), which merges into the elastic line approaching the $\Gamma$ point. Comparing our results with other parent Fe pnictides, we show the importance of structural parameters for the magnetic excitation spectrum, with small modifications of the tetrahedron angles and As height strongly affecting the magnetism.

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• Resolving the nature of electronic excitations in resonant inelastic x-ray scattering
• Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Magnetic moment evolution and spin freezing in doped BaFe${}_2$As${}_2$
• Anisotropic magnetic excitations and incipient Néel order in Ba(Fe${}_{1-x}$Mn${}_x$)${}_2$As${}_2$
• Spin dynamics in NaFeAs and NaFe${}_{0.53}$Cu${}_{0.47}$As probed by resonant inelastic X-ray scattering
• Fluctuating magnetism of Co- and Cu-doped NaFeAs