Temperature and magnetic field dependence of a Kondo system in the weak coupling regime

Yong-hui Zhang, Steffen Kahle, Tobias Herden, Christophe Stroh, Marcel Mayor, Uta Schlickum, Markus Ternes, Peter Wahl and Klaus Kern
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Yong-hui Zhang: Max-Planck Institute for Solid State Research
Steffen Kahle: Max-Planck Institute for Solid State Research
Tobias Herden: Max-Planck Institute for Solid State Research
Christophe Stroh: Institute of Nanotechnology, Karlsruhe Institute of Technology
Marcel Mayor: Institute of Nanotechnology, Karlsruhe Institute of Technology
Uta Schlickum: Max-Planck Institute for Solid State Research
Markus Ternes: Max-Planck Institute for Solid State Research
Peter Wahl: Max-Planck Institute for Solid State Research
Klaus Kern: Max-Planck Institute for Solid State Research

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract The Kondo effect arises due to the interaction between a localized spin and the electrons of a surrounding host. Studies of individual magnetic impurities by scanning tunneling spectroscopy have renewed interest in Kondo physics; however, a quantitative comparison with theoretical predictions remained challenging. Here we show that the zero-bias anomaly detected on an organic radical weakly coupled to a Au (111) surface can be described with astonishing agreement by perturbation theory as originally developed by Kondo 60 years ago. Our results demonstrate that Kondo physics can only be fully conceived by studying both temperature and magnetic field dependence of the resonance. The identification of a spin 1/2 Kondo system is of relevance not only as a benchmark for predictions for Kondo physics but also for correlated electron materials in general.

Date: 2013
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DOI: 10.1038/ncomms3110

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