Probing the Role of Co Substitution in the Electronic Structure of Iron Pnictides
Probing the Role of Co Substitution in the Electronic Structure of Iron Pnictides
The role of Co substitution in the low-energy electronic structure of $\mathrm{Ca}({\mathrm{Fe}}_{0.944}{\mathrm{Co}}_{0.056}{)}_{2}{\mathrm{As}}_{2}$ is investigated by resonant photoemission spectroscopy and density-functional theory. The Co $3d$ state center of mass is observed at 250 meV higher binding energy than that of Fe, indicating that Co possesses one extra valence electron and that …