Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-03-06
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 eps figures
Scientific paper
10.1103/PhysRevLett.93.156601
A nearly-free-electron (NFE) model to describe STM spectroscopy of (111) metal surfaces with Kondo impurities is presented. Surface states are found to play an important role giving a larger contribution to the conductance in the case of Cu(111) and Au(111) than Ag(111) surfaces. This difference arises from the farther extension of the Ag(111) surface state into the substrate. The different line shapes observed when Co is adsorbed on different substrates can be explained from the position of the surface band onset relative to the Fermi energy. The lateral dependence of the line shape amplitude is found to be bulk-like for R|| < 4 Amstrongs and surface-like at larger distances, in agreement with experimental data.
Gunnarsson Olle
Merino Jaime
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