Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Oxides and Insulators: Adsorption II

O 43.3: Vortrag

Mittwoch, 28. März 2007, 16:15–16:30, H42

Zero-bias conductance anomaly in single Au-CO complexes on a FeO thin film on Pt(111) — •Niklas Nilius, Emile Rienks, Hans-Peter Rust, and Hans-Joachim Freund — Fritz-Haber-Institut der MPG, Berlin

A thin film of FeO grown on Pt(111) forms a hexagonal Moiré pattern due to the 11% lattice mismatch with the metal support that is characterized by a modulated stacking sequence of the Fe ions with respect to the Pt(111) lattice. The spatial inhomogeneity of electronic and chemical properties within the Moire unit cell stimulates a self-organization of Au adatoms into a hexagonal adatom network. Conductance spectra of the adatoms reveal an unoccupied resonance at +0.5 eV, but no features around the Fermi level, as measured by low-temperature STS. After CO adsorption onto the Au monomers, a pronounced zero-bias anomaly appears in the differential conductance of the species. The phenomenon is discussed in terms of the Kondo effect that might be induced by a change of the spin/charge distribution of the Au-CO complex after CO adsorption.