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O: Oberflächenphysik

O 40: Adsorption an Oberfl
ächen IV

O 40.7: Talk

Tuesday, March 8, 2005, 12:15–12:30, TU EB202

Observation of two states of Ce adparticles on Ag(100) — •Markus Ternes, Marina Pivetta, François Patthey, and Wolf-Dieter Schneider — Institut de Physique des Nanostructures, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

We report on intriguing experimental results obtained with a scanning-tunneling microscope after evaporation of a small amount of Ce on a Ag(100) surface at low temperature (5K). Some adparticles (about 5%) can be switched from their initial state, where they appear large and with featureless dI/dV spectra around E_F, to a state where they appear smaller and with a narrow dip at the Fermi level in the dI/dV spectra. The latter is tentatively interpreted as a Kondo resonance with a Kondo temperature of about 30K. This observation may be related to a change in the 4f electron-valence band hybridization when passing from one state to the other.