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
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 328662
- DOI 10.1021/acs.jpcc.9b11141
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308740
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