Kondo effect of Co adatoms on Ag monolayers on noble metal surfaces
M.A. Schneider, P. Wahl, L. Diekhöner, L. Vitali, G. Wittich, K. Kern
Abstract
The Kondo temperature
T
K
of single Co adatoms on monolayers of Ag on Cu and Au(111) is determined using Scanning Tunneling Spectroscopy.
T
K
of Co on a single monolayer of Ag on either substrate is essentially the same as that of Co on a homogenous Ag(111) crystal. This gives strong evidence that the interaction of surface Kondo impurities with the substrate is very local in nature. By comparing
T
K
found for Co on Cu, Ag, and Au (111)-surfaces we show that the energy scale of the many-electron Kondo state is insensitive to the properties of surface states and to the energetic position of the projected bulk band edges.