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MA: Fachverband Magnetismus
MA 19: Surface and Interface Magnetism I (jointly with O)
MA 19.8: Vortrag
Dienstag, 12. März 2013, 12:15–12:30, H33
Tunable Kondo resonance of Co atoms on Ag(111) — •maría moro1,2, david serrate1,2, marten piantek3, josé ignacio pascual4, and manuel ricardo ibarra1,2 — 1Instituto de Nanociencia de Aragón and Laboratory for Advanced Microscopy, University of Zaragoza, Spain — 2Dpto. Física de Materia Condensada, University of Zaragoza, Spain — 3Instituto de Ciencias de Materiales de Aragón (ICMA), Spain — 4Nanoscience Cooperative Research Center (CIC Nanogune)
The magnetic properties of atoms on metals are inherently connected with manybody interactions between the localized magnetic moment and the supporting surface. The Kondo effect is the one most frequently found. The energy scale of a Kondo ground state depends strongly on the exchange coupling between atom and surface and, consequently, on the surface local density of states at the Fermi level (LDOS). Here, we study the effect of the LDOS on the magnetic ground state of Co atoms on Ag(111) by constructing artificial atomic structures, which confine surface states electrons and modulate in a pre-designed manner the LDOS. By intentionally placing individual atoms at sites with difference LDOS, the Kondo temperature can be varied between 60 to 145 K, demonstrating the precise control of the substrate LDOS is crucial for quantitative analysis of the Kondo state.