Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Surface Magnetism IV

MA 55.5: Talk

Thursday, March 17, 2011, 16:15–16:30, HSZ 103

Charge-transfer correlation effects on the spin state of magnetic molecules at a metal interface — •Sebastian Stepanow¹, Piter Miedema², Aitor Mugarza¹, Gustavo Ceballos¹, Paolo Moras³, Julio Cezar⁴, Carlo Carbone³, Frank de Groot², and Pietro Gambardella¹ — ¹ICN Barcelona — ²U Utrecht — ³CNR Trieste — ⁴ESRF Grenoble

We investigate the hierarchy of local correlation and hybridization effects in metal-organic molecules adsorbed on metals. Using x-ray magnetic circular dichroism and ligand field multiplet calculations, we demonstrate that the 3d electronic ground state of monolayer metal-phthalocyanine (CoPc, FePc) on Au(111) is given by the coherent superposition of two charge states, dⁿE+dⁿ⁺¹, where E represents a substrate electron bound to the central metal ion and dⁿ the many-body ionic orbital configuration of the unperturbed molecule. These results differ from previous models of hybrid metal-organic systems, and provide a consistent description of their magnetic properties in terms of spin and orbital multiplicity.