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Influence of shockley surface state in the Kondo resonance of Co adatoms on Ag(111)

AuthorsMoro-Lagares, María; Piantek, Marten; Pascual, José I.; Ibarra, M. Ricardo; Serrate, David
Issue Date2016
PublisherCSIC-ICN Centro de Investigación en Nanociencia y Nanotecnología (CIN2)
CitationFuerzas y Túnel (2016)
AbstractThe magnetic properties of magnetic atoms on metals are inherently connected with many body interactions between the localized magnetic moments and the supporting surface. This is because the electronic orbitals of atoms couple with the continuum of conduction electrons of the metal host. But this influence is reciprocal, since the properties of the substrate also change locally due to the presence of an atom. The understanding of the behavior of the spin moments of the atoms on a metal surface is one of the pillars of spintronics for the development of prototypes at the atomic scale. In particular, the study of the Kondo resonance appearing under particular conditions when a magnetic adatom lies on a metal surface provides deep insight into the involved magnetic interactions. We have chosen Co/Ag(111) as a model system to study the influence of the host LDOS in the Kondo effect of Co atoms. Combining STS and lateral manipulation techniques, we have carried out a study of the Kondo resonance as a function of the contacting lead LDOS of the Ag(111) surface with accurate control of the Co position. This has enabled us to probe a high degree of inhomogeneity in the surface state of Ag(111). Here we unambiguously identify the relevant contribution of surface state electrons to the relevant energy scale of the many-body Kondo sate (the Kondo temperature TK), in contrast to other previous works. This entails that the coupling strength between a magnetic impurity and its foremost environment can be tuned through the electronic properties of the metal host, leading to important fundamental and technological implications.
DescriptionResumen del trabajo presentado a la 10th Conferencia Fuerzas y Túnel, celebrada en Girona (España) del 5 al 7 de septiembre de 2016.-- et al.
Appears in Collections:(ICMA) Comunicaciones congresos
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