Presence of magnetic excitations in SmFeAsO

Pelliciari, Jonathan; Dantz, Marcus; Huang, Yaobo; Strocov, Vladimir N.; Xing, Lingyi; Wang, Xiancheng; Jin, Changqing; Schmitt, Thorsten

doi:10.1063/1.4962966

Cited by 18 publications

(32 citation statements)

References 34 publications

(93 reference statements)

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“…Clearly, Fe-L edge XAS confirms that in EuFe 2 As 2 Fe has the common 2+ oxidation state. Furthermore, the spectra do not show any multiplet structure common to oxides, confirming the high sample quality and the success of the in situ cleaving [40][41][42]65,66 . The FWHM of this peak is about 3 eV and is unchanged moving from EuFe 2 As 2 to BaFe 2 As 2 , indicating that the electronic structure is similar for the two compounds.…”

Section: Resultsmentioning

confidence: 62%

“…1(b), we plot the Fe-L 2,3 XAS spectrum of EuFe 2 As 2 together with the one of BaFe 2 As 2 . The spectra display two broad peaks at ≈708 and 720 eV typical of Fe pnictides, ascribed to the L 3 and L 2 absorption edges [40][41][42]65,66 . In both compounds, the spectra are rather similar with minor differences in the shoulder at 711 eV.…”

Section: Resultsmentioning

confidence: 99%

“…2(a) In recent years, RIXS has received a lot of attention due to the huge instrumental improvements in terms of both energy resolution and flux 58,59 permitting the detection of magnetic excitations in high temperature superconductors such as cuprates and Fe pnictides [40][41][42][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95] .…”

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confidence: 99%

“…3(b) we additionally show the fitting of the full emission line carried out as in Refs. [40][41][42]66 employing the following formulas: …”

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confidence: 99%

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Local and collective magnetism ofEuFe2As2

et al. 2017

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We present an experimental study of the local and collective magnetism of EuFe 2 As 2 , that is isostructural with the high temperature superconductor parent compound BaFe 2 As 2 . In contrast to BaFe 2 As 2 , where only Fe spins order, EuFe 2 As 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 β x-ray emission experiments on EuFe 2 As 2 single crystals reveal a local magnetic moment of 1.3±0.15 µ B at 15 K that slightly increases to 1.45±0.15 µ 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) → (1, 0) and (0, 0) → (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 AFe 2 As 2 series (A = Ba, Ca, and Sr), especially the well characterized BaFe 2 As 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.2

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

“…3(b) we additionally show the fitting of the full emission line carried out as in Refs. [40][41][42]66 employing the following formulas: …”

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confidence: 99%

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Local and collective magnetism ofEuFe2As2

et al. 2017

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“…These physical entities represent different aspects of magnetism, have different characteristic time and energy scales, and are probed by different experimental techniques 20 . μ bare is detected by local probes such as photoelectron, X-ray absorption, and X-Ray emission spectroscopy 14, 15, 19, 20, 45–47 , whereas μ corr is measured by employing inelastic spectroscopies, such as inelastic neutron scattering 6, 48, 49 and resonant inelastic X-ray scattering 12, 13, 50, 51 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic moment evolution and spin freezing in doped BaFe2As2

Pelliciari

Huang

Ishii

et al. 2017

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Fe-Kβ X-ray emission spectroscopy measurements reveal an asymmetric doping dependence of the magnetic moments μ bare in electron- and hole-doped BaFe2As2. At low temperature, μ bare is nearly constant in hole-doped samples, whereas it decreases upon electron doping. Increasing temperature substantially enhances μ bare in the hole-doped region, which is naturally explained by the theoretically predicted crossover into a spin-frozen state. Our measurements demonstrate the importance of Hund’s-coupling and electronic correlations, especially for hole-doped BaFe2As2, and the inadequacy of a fully localized or fully itinerant description of the 122 family of Fe pnictides.

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