Based on the experimental observation, that only the close vicinity of a magnetic impurity at metal surfaces determines its Kondo behaviour, we introduce a simple model which explains the Kondo temperatures observed for cobalt adatoms at the (111) and (100) surfaces of Cu, Ag, and Au. Excellent agreement between the model and scanning tunneling spectroscopy (STS) experiments is demonstrated. The Kondo temperature is shown to depend on the occupation of the d-level determined by the hybridization between adatom and substrate with a minimum around single occupancy.
@article{arxiv.cond-mat/0403174,
title = {Kondo temperature of magnetic impurities at surfaces},
author = {P. Wahl and L. Diekhöner and M. A. Schneider and L. Vitali and G. Wittich and K. Kern},
journal= {arXiv preprint arXiv:cond-mat/0403174},
year = {2009}
}