Figure 5
DOSes (positive values for up and negative values for down spin channels) for (A) an oxygen-free surface with zero (red), one (green) or two (blue) Cr atoms corresponding to the strongest binding configuration; (B) as (A) but with an oxygen atom at the hollow site. The horizontal axis is energy in eV relative to the Fermi energy, and the vertical axis is the DOS in arbitrary units. The numbers in the legends indicate the position(s) of the Cr atom(s) (see Fig. 1 for the numbering scheme). The lone hyphen indicates the absence of Cr atoms in the surface.
