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Kondo Effect in Single Atom Contacts: The Importance of the Atomic Geometry

AuthorsVitali, Lucia ; Ohmann, Robin; Stepanow, Sebastian; Gambardella, Pietro; Tao, Kun; Huang, Renzhong; Stepanyuk, Valeri S.; Bruno, Patrick; Kern, Klaus
Keywords[PACS] Nanoscale contacts (electronic transport)
[PACS] Scanning tunneling microscopy of surfaces, interfaces and thin films
[PACS] Basis sets and related methodology (condensed matter electronic structure)
[PACS] Surface impurity and defect levels; energy states of adsorbed species
Issue Date18-Nov-2008
PublisherAmerican Physical Society
CitationPhysical Review Letters 101, 216802 (2008)
AbstractCo single atom junctions on copper surfaces are studied by scanning tunneling microscopy and ab initio calculations. The Kondo temperature of single cobalt atoms on the Cu(111) surface has been measured at various tip-sample distances ranging from tunneling to the point contact regime. The experiments show a constant Kondo temperature for a whole range of tip-substrate distances consistently with the predicted energy position of the spin-polarized d levels of Co. This is in striking difference to experiments on Co/Cu(100) junctions, where a substantial increase of the Kondo temperature has been found. Our calculations reveal that the different behavior of the Co adatoms on the two Cu surfaces originates from the interplay between the structural relaxations and the electronic properties in the near-contact regime.
Description4 pages, 3 figures.-- PACS nrs.: 73.63.Rt; 68.37.Ef; 71.15.Ap; 73.20.Hb.-- ArXiv pre-print available at: http://arxiv.org/abs/0808.0585
Contains Electronic Physics Auxiliary Publication for "Kondo effect in single adatom contacts: the importance of the atomic geometry" (2 extra pages, 1 EPAPS figure).
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.101.216802
Appears in Collections:(CIN2) Artículos
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