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The electronic structure of LiFeAs and NaFeAs probed by resonant inelastic x-ray scattering spectra

Results of resonant inelastic X-ray scattering (RIXS) measurements at Fe L-edges and electronic structure calculations of LiFeAs and NaFeAs are presented. Both experiment and theory show that in the vicinity of the Fermi energy, the density of states is dominated by contributions from Fe 3d-states. The comparison of Fe L2,3 non-resonant and resonant (excited at L2-threshold) X-ray emission spectra with spectra of LaOFeAs and CaFe2As2 show a great similarity in energy and I(L2)/I(L3) intensity ratio. The I(L2)/I(L3) intensity ratio of all FeAs-based superconductors is found to be more similar to metallic Fe than to correlated FeO. Basing on these measurements we conclude that iron-based superconductors are weakly or moderately correlated systems.

preprint2009arXivOpen access
E. Z. KurmaevJ. McLeodN. A. SkorikovL. D. FinkelsteinA. MoewesM. A. KorotinYu. A. IzyumovS. Clarke
cond-mat.supr-con
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E. Z. KurmaevJ. McLeodN. A. SkorikovL. D. FinkelsteinA. MoewesM. A. KorotinYu. A. IzyumovS. Clarke

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