Mixed-valence behavior and strong correlation effects of metal phthalocyanines adsorbed on metals

S. Stepanow, P. S. Miedema, A. Mugarza, G. Ceballos, P. Moras, J. C. Cezar, C. Carbone, F. M.F. De Groot, P. Gambardella

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120 Citations (Scopus)

Abstract

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 antiferromagnetically coupled 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 moments and Kondo physics in terms of spin and orbital multiplicity. © 2011 American Physical Society.
Original languageEnglish
Article number220401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number22
DOIs
Publication statusPublished - 9 Jun 2011

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