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Adsorption-induced kondo effect in metal-free phthalocyanine on Ag(111)

  • Granet, J. Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
  • Sicot, M. Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
  • Gerber, I. C. Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue de Rangueil, 31077 Toulouse, France
  • Kremer, Geoffroy Université de Lorraine, CNRS, IJL, F-54000 Nancy, France - Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland
  • Pierron, T. Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
  • Kierren, B. Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
  • Moreau, L. Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
  • Fagot-Revurat, Y. Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
  • Lamare, S. Univ. Bourgogne Franche-Comté, FEMTO-ST, CNRS, UFC, 15B avenue des Montboucons, F-25030 Cedex Besançon, France
  • Chérioux, F. Univ. Bourgogne Franche-Comté, FEMTO-ST, CNRS, UFC, 15B avenue des Montboucons, F-25030 Cedex Besançon, France
  • Malterre, D. Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
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    14.05.2020
Published in:
  • The Journal of Physical Chemistry C. - 2020, vol. 124, no. 19, p. 10441–10452
English We report on the formation of a two-dimensional supramolecular Kondo lattice made of organic molecules comprising only C, N, and H atoms, namely metal-free phthalocyanines 2HPc (C32H18N8), adsorbed on a Ag(111) surface. Low-temperature scanning tunneling microscopy/spectroscopy (LT-STM/STS), ultraviolet photoemission spectroscopy (UPS), and density functional theory (DFT) are used to investigate the electronic structure of the system for low molecular density and commensurate self- assemblies. Abrikosov–Suhl resonances that are characteristic of the arising of a Kondo effect are observed by using both STS and UPS at low temperature. Whereas freestanding 2HPc is a no-spin-bearing molecule, it acquires an unpaired electron in its π-conjugated lowest unoccupied molecular orbital (LUMO) upon adsorption on Ag. As a result, the Kondo effect can be interpreted as originating from the interaction between this unpaired π-spin and the Ag Fermi sea. Extra side resonances are observed in STS spectra that are a manifestation of the coupling between the π electron and molecular vibrational excitations, qualifying the effect as the molecular vibrational Kondo effect. The variation of the Kondo temperature TK  of single molecules and upon two-dimensional self-assembly is discussed. This study brings new insights into the Kondo-related physics in correlation with molecular spins and low dimensionality. Moreover, it may open new routes to the synthesis of organic molecular spintronic devices.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308740
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