Local and collective magnetism of EuFe${}_2$As${}_2$

Abstract

We present an experimental study of the local and collective magnetism of $\mathrm{EuF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$, that is isostructural with the high temperature superconductor parent compound $\mathrm{BaF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$. In contrast to $\mathrm{BaF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$, where only Fe spins order, $\mathrm{EuF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$ has an additional magnetic transition below 20 K due to the ordering of the Eu${}^{2+}$ spins ($J=7/2$, with $L=0$ and $S=7/2$) in an A-type antiferromagnetic texture (ferromagnetic layers stacked antiferromagnetically). This may potentially affect the FeAs layer and its local and correlated magnetism. Fe-K${}_{\beta }$ x-ray emission experiments on $\mathrm{EuF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$ single crystals reveal a local magnetic moment of 1.3$\pm 0.15{\mu }_B$ at 15 K that slightly increases to 1.45$\pm 0.15{\mu }_B$ at 300 K. Resonant inelastic x-ray scattering (RIXS) experiments performed on the same crystals show dispersive broad (in energy) magnetic excitations along $(0,0)\to (1,0)$ and $(0,0)\to (1,1)$ with a bandwidth on the order of 170-180 meV. These results on local and collective magnetism are in line with other parent compounds of the $\mathrm{AF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$ series ($A=$ Ba, Ca, and Sr), especially the well characterized $\mathrm{BaF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$. Thus, our experiments lead us to the conclusion that the effect of the high magnetic moment of Eu on the magnitude of both Fe local magnetic moment and spin excitations is small and confined to low energy excitations.

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Cited by in corpus (5)

• 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${}_x$)${}_2$
• 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