Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Spin Effects in Molecules at Surfaces (jointly with DS, MA)
O 40.1: Vortrag
Mittwoch, 13. März 2013, 09:30–09:45, H23
Weak Coupling Kondo Effect in a Purely Organic Molecule: Universal Temperature and Magnetic Field Dependence — •Markus Ternes1, Steffen Kahle1, Yung-hui Zhang1, Tobias Herden1, Uta Schlickum1, Peter Wahl1, 2, and Klaus Kern1, 3 — 1Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany — 2School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Scotland — 3Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
The Kondo effect is one of the most intriguing any-particle phenomenon in solid-state physics due to the simplicity of the underlying model: the scattering of itinerant electrons at a localized spin.[1] It has been intensely studied on the single atomic and molecular level by scanning tunneling spectroscopy (STS) in the last two decades; however a quantitative comparison with theoretical predictions remained challenging due to orbital degeneracies and a spin quantum number higher than 1/2. Here, we present STS measurements on an purely organic radical coupled to the conduction electrons of a Au(111) surface. The observed zero bias anomaly is due to a spin 1/2 Kondo screening in the weak coupling limit. We can describe the temperature and magnetic field dependence of the spectral features practically parameter free by perturbation theory allowing quantitative tests on more complex theoretical models.
[1] A. C. Hewson, 1997: The Kondo Problem to Heavy Fermions, Cambridge University Press