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Abstract
Resonant x-ray emission spectroscopy (XES) measurements at FeL2,3 edges and electronic structure calculations for LiFeAs and NaFeAs are presented.Experiment and theory show that in the vicinity of the Fermi energy, the density ofstates is dominated by contributions from Fe 3d states. The comparison of FeL2,3 XESwith spectra of related FeAs compounds reveals similar trends in energy and the ratio of intensities of theL2 andL3 peaks (I(L2)/I(L3) ratio).The I(L2)/I(L3) ratio for all FeAs-based superconductors is found to be closer to that of metallic Fe thanthat of the strongly correlated FeO. We conclude that iron-based superconductors areweakly or, at most, moderately correlated systems.
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