Kondo temperature of magnetic impurities at surfaces

Abstract

Based on the experimental observation, that only the close vicinity of a magnetic impurity at metal surfaces determines its Kondo behaviour, we introduce a simple model which explains the Kondo temperatures observed for cobalt adatoms at the (111) and (100) surfaces of Cu, Ag, and Au. Excellent agreement between the model and scanning tunneling spectroscopy (STS) experiments is demonstrated. The Kondo temperature is shown to depend on the occupation of the d-level determined by the hybridization between adatom and substrate with a minimum around single occupancy.

4 pages, 2 figures

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• Nonequilibrium theory of scanning tunneling spectroscopy via adsorbate resonances: nonmagnetic and Kondo impurities
• Scaling theory of the Kondo screening cloud
• Simple model for scanning tunneling spectroscopy of noble metal surfaces with adsorbed Kondo impurities

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• The signature of subsurface Kondo impurities in the local tunnel current
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