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Gretarsson, H.*; 野村 拓司; Jarrige, I.*; Lupascu, A.*; Upton, M. H.*; Kim, J.*; Casa, D.*; Gog, T.*; Yuan, R. H.*; Chen, Z. G.*; et al.
Physical Review B, 91(24), p.245118_1 - 245118_8, 2015/06
被引用回数:6 パーセンタイル:28.15(Materials Science, Multidisciplinary)We report an Fe -edge resonant inelastic X-ray scattering (RIXS) study of KFeSe. 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 orbital model, using a moderate = 2.5 eV, indicate that the 1 eV feature originates from the correlated Fe 3 electrons, with a dominant and orbital character. We find that a moderate yields a satisfying agreement with the experimental spectra, suggesting that the electron correlations in the insulating and metallic iron based superconductors are comparable.