Resonant inelastic x-ray scattering study of charge excitations in superconducting and nonsuperconducting PrFeAsO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:math>

Jarrige, Ignace; Nomura, Takuji; Ishii, Kenji; Gretarsson, H.; Kim, Y.-J.; Kim, J.; Upton, M. H.; Casa, D.; Gög, T.; Ishikado, M.; Fukuda, Tatsuo; Yoshida, Masahiro; Hill, J. P.; Liu, X.; Hiraoka, Nozomu; Tsuei, Ku‐Ding; Shamoto, S.

doi:10.1103/physrevb.86.115104

Cited by 8 publications

(16 citation statements)

References 22 publications

(16 reference statements)

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“…We note that the lineshape and energy loss of the L-edge RIXS excitations are sharply different from the K-edge data 26,27 . As discussed in the next section, this is not unexpected since the spectral weight in K-edge RIXS is dominated by orbital-diagonal transitions, whereas the L-edge spectral weight mostly arises from orbital off-diagonal transitions.…”

Section: Methodscontrasting

confidence: 73%

Resonant inelastic x-ray scattering study of entangled spin-orbital excitations in superconductingPrFeAsO0.7

et al. 2016

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Low-energy electron excitation spectra were measured on a single crystal of a typical iron-based superconductor PrFeAsO0.7 using resonant inelastic X-ray scattering (RIXS) at the Fe-L3 edge. Characteristic RIXS features are clearly observed around 0.5, 1-1.5 and 2-3 eV energy losses. These excitations are analyzed microscopically with theoretical calculations using a 22-orbital model derived from first-principles electronic structure calculation. Based on the agreement with the experiment, the RIXS features are assigned to Fe-d orbital excitations which, at low energies, are accompanied by spin flipping and dominated by Fe dyz and dxz orbital characters. Furthermore, our calculations suggest dispersive momentum dependence of the RIXS excitations below 0.5 eV, and predict remarkable splitting and merging of the lower-energy excitations in momentum space. Those excitations, which were not observed in the present experiment, highlight the potential of RIXS with an improved energy resolution to unravel new details of the electronic structure of the iron-based superconductors.

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Section: Methodscontrasting

confidence: 73%

Resonant inelastic x-ray scattering study of entangled spin-orbital excitations in superconductingPrFeAsO0.7

et al. 2016

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“…Calculations based on 70 orbital model, using a moderate U eff ≈ 2.5 eV, indicate that the 1 eV feature originates from the correlated Fe 3d electrons with a dominant d xz and d yz orbital character, emphasizing the importance of those orbitals across different families of iron based superconductors. The momentum dependence of the dd-excitation in K 0.83 Fe 1.53 Se 2 is found to be quite different from a similar excitation in PrFeAsO, 7 we speculate that this most likely originates from their dissimilar magnetic ordering. Our results show that a moderate U eff is in qualitative agreement with our RIXS spectrum, suggesting that comparable correlations can be found in the insulating and metallic iron based superconductors.…”

Section: Discussionmentioning

confidence: 57%

“…Comparison of their results with ab initio calculation supported a moderate Coulomb repulsion of U eff ≈ 2.5 eV in the parent PrFeAsO compound. 7 At the Fe L 3 -edge where spectra are also dominated by a strong fluorescence signal, 8 a recent RIXS experiment succeeded in observing paramagnons in (Ba 1−x K x )Fe 2 As 2 , 9 in a similar fashion to a recent study on cuprates. 10 Although it was difficult to extract momentum dependence of the observed excitations, due to extremely low count rate, these results are encouraging.…”

Section: Introductionmentioning

confidence: 85%

Resonant inelastic x-ray scattering study of electronic excitations in insulatingK0.83Fe1.53Se2

et al. 2015

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We report an Fe K-edge resonant inelastic X-ray scattering (RIXS) study of K0.83Fe1.53Se2. This material is an insulator, unlike many parent compounds of iron-based superconductors. We found a sharp excitation around 1 eV, which is resonantly enhanced when the incident photon energy is tuned near the pre-edge region of the absorption spectrum. The spectral weight and line shape of this excitation exhibit clear momentum dependence. In addition, we observe momentum-independent broad interband transitions at higher excitation energy of 3-7 eV. Calculations based on a 70 band dp orbital model, using a moderate U eff ≈ 2.5 eV, indicate that the ∼1 eV feature originates from the correlated Fe 3d electrons, with a dominant dxz and dyz orbital character. We find that a moderate U eff yields a satisfying agreement with the experimental spectra, suggesting that the electron correlations in the insulating and metallic iron based superconductors are comparable.

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“…Such sharp crystal field excitation peaks have only been observed in a RIXS Fe K-edge study on PrFeAsO 1−y so far, to the best of our knowledge. 26 In the PrFeAsO 1−y RIXS study, a relatively weak fluorescence background allowed to observe dd excitations and charge transfer excitations, the energy that was used subsequently to infer values for intraorbital Coulomb repulsion and Hund's coupling. Furthermore, the dd excitations in BaFe 2 Se 3 are similar to those observed in hematite Fe 2 O 3 , a correlated transition metal oxide, 21 although appearing here at smaller energy losses.…”

Section: Fe L 3 Edge Datamentioning

confidence: 99%

Resonant inelastic x-ray scattering at the FeL3edge of the one-dimensional chalcogenide BaFe2Se3

et al. 2013

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We present an electronic structure study of the quasi-one-dimensional chalcogenide BaFe 2 Se 3 using resonant inelastic x-ray scattering (RIXS) at the Fe L 3 edge. In addition to broad spectral contributions from fluorescence, sharp peaks are seen at the low-energy end of the spectra, suggesting the coexistence of both band and localized properties in this compound up to the antiferromagnetic transition temperature. The width of the fluorescence line can be accounted for by band structure calculations, while the positions of the sharp peaks are in good agreement with crystal-field multiplet calculations. At measurement temperatures below 300 K, the temperature dependence of the low-energy part of the spectra is accounted for by the changes in thermal occupation of closely lying energy states. At 300 K, however, a substantial broadening of the spectra is observed at low-energy loss, which is consistent with the closure of the antiferromagnetic band gap.

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Resonant inelastic x-ray scattering study of charge excitations in superconducting and nonsuperconducting PrFeAsO1−y

Cited by 8 publications

References 22 publications

Resonant inelastic x-ray scattering study of entangled spin-orbital excitations in superconductingPrFeAsO0.7

Resonant inelastic x-ray scattering study of entangled spin-orbital excitations in superconductingPrFeAsO0.7

Resonant inelastic x-ray scattering study of electronic excitations in insulatingK0.83Fe1.53Se2

Resonant inelastic x-ray scattering at the FeL3edge of the one-dimensional chalcogenide BaFe2Se3

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