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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, and P. Gambardella
Phys. Rev. B 83, 220401(R) – Published 9 June 2011
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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.

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  • Received 21 March 2011

DOI:https://doi.org/10.1103/PhysRevB.83.220401

©2011 American Physical Society

Authors & Affiliations

S. Stepanow1, P. S. Miedema2, A. Mugarza1, G. Ceballos1, P. Moras3, J. C. Cezar4, C. Carbone3, F. M. F. de Groot2, and P. Gambardella1,5

  • 1Catalan Institute of Nanotechnology (ICN-CIN2), UAB Campus, E-08193 Barcelona, Spain
  • 2Debye Institute of Nanomaterials Science, Utrecht University, NL-3584 CA Utrecht, The Netherlands
  • 3Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Area Science Park, I-34012 Trieste, Italy
  • 4European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
  • 5ICREA and Universitat Autònoma de Barcelona, E-08193 Barcelona, Spain

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Issue

Vol. 83, Iss. 22 — 1 June 2011

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