Observation of two-hole satellite in the resonant x-ray photoemission spectra ofBa1−xKxFe2As2single crystals

Abstract

We probe the correlation regime of ${\text{Ba}}_{1\ensuremath{-}x}{\text{K}}_{x}{\text{Fe}}_{2}{\text{As}}_{2}$ single crystals by x-ray photoemission spectroscopy. Although the data explicitly confirm the itinerant character of the electrons, the satellite features observed at the ${L}_{3}$ threshold indicate at the same time local behavior. This dichotomy suggests that, although the pnictides appear to be unusually weakly correlated, local electronic excitations cannot be neglected for the correct description of the material.