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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents

ID: 192844.0, MPI für Festkörperforschung / FKF Publikationen 2004
Simple model for scanning tunneling spectroscopy of noble metal surfaces with adsorbed Kondo impurities
Authors:Merino, J.; Gunnarsson, O.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Physical Review B
Issue / Number:11
Sequence Number of Article:115404
Review Status:not specified
Audience:Not Specified
Abstract / Description:A simple model is introduced to describe conductance measurements
between a scanning tunneling microscope tip and a noble metal surface
with adsorbed transition metal atoms which display the Kondo effect.
The model assumes a realistic parametrization of the potential created
by the surface and a d(3z)(2)-r(2) orbital for the description of the
adsorbate. Fano line shapes associated with the Kondo resonance are
found to be sensitive to details of the adsorbate-substrate
interaction. For instance, bringing the adsorbate closer to the surface
leads to more asymmetric line shapes while their dependence on the tip
distance is weak. We find that it is important to use a realistic
surface potential to properly include the tunneling matrix elements to
the tip and to use substrate states which are orthogonal to the
adsorbate and tip states. An application of our model to Co adsorbed on
Cu explains the difference in the line shapes observed between Cu(100)
and Cu(111) surfaces.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Max Planck Inst Festkorperforsch, D-70506 Stuttgart, Germany.
Identifiers:ISI:000220814000118 [ID No:1]
ISSN:1098-0121 [ID No:2]
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