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Mixed 4f population of Tm adatoms on insulating Cu2N islands

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Abstract

The electronic properties of Tm and Lu atoms adsorbed on nanoscale Cu2N insulating islands and on a clean Cu(100) surface have been investigated by scanning tunnelling microscopy and spectroscopy, and density functional calculations modelling the electronic structure of the rare earth atoms were performed. While Lu adatoms display the same spectra on both surfaces, tunnelling spectra of Tm on Cu2N indicate a state at ≃0.8 V or ≃1.9 V bias, depending on the 4f population of the adatom, 4f12 or 4f13, which is not present on Tm atoms adsorbed on Cu(100). Although inelastic 4f-spin-flip excitations were not detected, variation of tunnelling through the strongly correlated d-electrons indicates that the insulating layer opens a pathway to access the electronic state of those 4f electrons in the single adatom.

Graphical abstract: Mixed 4f population of Tm adatoms on insulating Cu2N islands

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Publication details

The article was received on 08 Aug 2019, accepted on 14 Nov 2019 and first published on 18 Nov 2019


Article type: Paper
DOI: 10.1039/C9CP04413B
Phys. Chem. Chem. Phys., 2020, Advance Article

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    Mixed 4f population of Tm adatoms on insulating Cu2N islands

    D. Coffey, C. de la Fuente, M. Ciria, D. Serrate, S. Loth and J. I. Arnaudas, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP04413B

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