Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 74: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 74.13: Vortrag

Mittwoch, 2. April 2014, 18:15–18:30, BEY 81

Double Kondo effect induced by combining two non-Kondo systems: Fe atoms and polyphenyl molecules on Cu(111) — •Giulia Pacchioni, Marina Pivetta, Luca Gragnaniello, Fabio Donati, Stefano Rusponi, and Harald Brune — Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

We use scanning tunneling spectroscopy and X-ray magnetic circular dichroism to investigate the Kondo effect for a system formed by individual Fe atoms adsorbed under polyphenyl-dicarbonitrile molecules on Cu(111).

Neither the molecules nor the Fe atoms adsorbed on the substrate display the Kondo effect. Combining them by burying the Fe adatoms below a phenyl ring of the organic molecules induces a Kondo effect in the Fe atoms as well as in the molecules. For the molecules this is inferred from scanning tunneling spectroscopy showing an intense Kondo peak above the phenyl ring. A Fano dip with twice the Kondo temperature is detected above the buried Fe atoms. X-ray magnetic circular dichroism reveals the screening of the magnetic moment for the buried Fe atoms, confirming the Kondo effect also for Fe.