Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 98: Focus Session: Visualization of Heavy Fermion Formation through Scanning Tunneling Microscopy

TT 98.2: Topical Talk

Donnerstag, 19. März 2015, 15:30–16:00, H 0104

The Single-Atom Kondo Effect as a Local Probe for Magnetic Interactions — •Jörg Kröger — Institut für Physik, Technische Universität Ilmenau, 98693 Ilmenau, Germany

The Kondo effect of single magnetic atoms adsorbed to metal surfaces induces a zero-bias feature in spectra of the differential conductance acquired with a scanning tunnelling microscope. From the resonance line shape information on the interaction of the magnetic impurity with its local environment may be deduced. Embedding a single Co atom in artificially fabricated clusters of several Cu atoms leads to pronounced changes in the line shape of the Abrikosov-Suhl-Kondo resonance. Similar hybridization effects occur in single-atom junctions comprising non-magnetic as well as magnetic tips and a single Kondo atom. The distance-dependent magnetic interaction between two Co atoms has been explored in linear CoCu_nCo clusters.

Financial support by the Deutsche Forschungsgemeinschaft through SFB 668 and KR 2912/7-1 is acknowledged.