Electronic structure of single-crystalline Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ probed by x-ray absorption spectroscopy: Evidence for isovalent substitution of Fe${}^{2+}$ by Co${}^{2+}$

M. Merz, F. Eilers, Th. Wolf +3

The substitutional dependence of valence and spin-state configurations of Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ ($x=$ 0, 0.05, 0.11, 0.17, and 0.38) is investigated with near-edge x-ray…