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O: Fachverband Oberflächenphysik

O 27: Organic/bio Molecules on Metal Surfaces III

O 27.1: Vortrag

Dienstag, 1. April 2014, 10:30–10:45, TRE Phy

Kondo effect in PTCDA/Au(111) induced by doping with single gold atoms — •Taner Esat¹, Christian Wagner¹, Ruslan Temirov¹, Stefan Tautz¹, Thorsten Deilmann², Peter Krüger², and Michael Rohlfing² — ¹Peter Grünberg Institute (PGI-3), Forschungszentrum Jülich, Germany — ²Institut für Festkörpertheorie, Universität Münster, D-48149 Münster, Germany

Interest in molecular magnets has been growing rapidly for the last few years. Understanding and gaining control over their properties might open a route to nanospintronics and quantum computing. One of the interesting possibilities to tune the magnetic properties of molecules is by controlled charge transfer from other molecules [1] or metal surfaces [2]. In this work we show another approach by doping non-magnetic molecules physisorbed on metal surfaces with single metal atoms.

By means of LT-STM and STS we have investigated the adsorption of single Au adatoms on a PTCDA monolayer adsorbed on a Au(111) surface.

We find two different types of Au adatoms on PTCDA which differ in their STS spectra and apparent size in the STM images. Both types show a pronounced peak in dI/dV conductance at zero bias. Temperature dependent measurements of FWHM and height of the zero-bias conductance peak confirm that the peak originates from the Kondo effect with a corresponding Kondo temperature of 37.5 ± 6.5 K.
I. Fernández-Torrente et al.,Phys. Rev. Lett. 108, 036801 (2012)
R. Temirov et al., Nanotechnology 19 (6), 065401 (2008)