Long-range electronic interactions between adatoms on transition metal   surfaces
  Ab initio calculations of surface-state mediated interactions between Cu adatoms on transition metal surfaces are presented. We concentrate on Co/Cu(111) and Co(0001) substrates and compare results with our calculations for Cu(111). Our studies show that surface states of Co/Cu(111) and Co(0001) are spin-polarized. We reveal that long-range interactions between adatoms are mainly determined by sp-majority states. In contrast to Cu(111) and Co/Cu(111), the interaction between adatoms on Co(0001) is strongly suppressed at large adsorbate separations. 
V. S. Stepanyuk (1), L. Niebergall (1), A. N. Baranov (2), W. Hergert   (2), P. Bruno (1) ((1) Max-Planck-Institut fuer Mikr...