Surface segregation in dilute binary fcc transition-metal alloys

We present a tight-binding study of the surface segregation energy of transition-metal impurities in fcc transition metals. Various approaches to the self-consistent determination of the impurity potentials are discussed and their results are compared. When size effects can be neglected, the trends followed by the segregation energy are qualitatively given by the difference of surface energies between the solute and the solvent species if electronic correlation effects are not too large. These size and electronic correlation effects are finally discussed.