Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Surface magnetism II (jointly with MA)

O 55.1: Talk

Wednesday, March 16, 2011, 15:00–15:15, CHE 184

Hyrogen-induced Kondo effect for Co/Pt(111) — •Quentin Dubout, Fabian Calleja Mitja, Markus Etzkorn, Anne Lehnert, Laurent Claude, Pietro Gambardella, and Harald Brune — Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

We present 0.4 K Scanning Tunneling Spectroscopy (STS) results on hydrogenated Co adatoms on Pt(111). Molecular H dosage creates two Co-H adsorption complexes with comparable abundance. Type I displays very large (~40 %) inelastic conductance steps that originate from vibrations, as evidenced by their shift when substituting H by D. Type II displays smaller (~5 %) conductance steps at higher energies, again due to H vibrations, together with a large conductance peak at the Fermi level. This feature is attributed to the Kondo effect. Its splitting in magnetic fields up to 8 Tesla identifies the Co-H complex as a S = 1/2 system, whereas clean Co/Pt(111) has a spin of 1 and shows no Kondo effect. H-adsorption has been reported to quench the Kondo effect, here we show that it can produce it.