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O: Fachverband Oberflächenphysik

O 50: Symposium: Surface Spectroscopy on Kondo Systems II (Invited Speakers: Jonathan Denlinger, Johann Kroha, Alexander Schneider)

O 50.8: Talk

Wednesday, February 27, 2008, 17:45–18:00, HE 101

Conductance and Kondo effect of a controlled single atom contact — •néel nicolas, kröger jörg, limot laurent, and berndt richard — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany

The tip of a low-temperature scanning tunneling microscope is brought into contact with individual cobalt atoms adsorbed on Cu(100). A smooth transition from the tunneling regime to contact occurs at a conductance G around the quantun of conductance G0. Spectroscopy in the contact regime, i. ,e., at currents in a micro-ampere range was achieved and indicated a significant change of the Kondo temperature TK. Calculations indicate that the proximity of the tip shifts the cobalt d-band and thus affects TK.