P Wahl et al 2009 New J. Phys. 11 113015 doi:10.1088/1367-2630/11/11/113015
Kondo-effect of substitutional cobalt impurities at copper surfaces
P Wahl1, A P Seitsonen2, L Diekhöner1,4, M A Schneider1,5 and K Kern1,3
Show affiliationsThe influence of the coordination on the Kondo temperature of a magnetic impurity at a noble metal surface and the line shape observed in low temperature scanning tunneling spectroscopy (STS) is investigated for single cobalt atoms adsorbed on and embedded in copper surfaces. Surprisingly, the Kondo temperature for substitutional cobalt atoms is almost the same as that of adatoms on the Cu(100) surface. This is in stark contrast to the behaviour observed at the Cu(111) surface. DFT calculations reveal that in the case of Cu(100) the coupling of the spin of the cobalt atom to the conduction band is not substantially increased by the incorporation of the cobalt atom. At the same time the observed line shape differs strongly from what is observed on adatom systems.
- PACS
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75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena
75.30.Hx Magnetic impurity interactions
73.20.Hb Impurity and defect levels; energy states of adsorbed species
71.15.Mb Density functional theory, local density approximation, gradient and other corrections
68.43.-h Chemisorption/physisorption: adsorbates on surfaces
- Subjects
- Dates
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Issue 11 (November 2009)
Received 23 July 2009
Published 6 November 2009
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Kondo-effect of substitutional cobalt impurities at copper surfaces
P Wahl et al 2009 New J. Phys. 11 113015
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