Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies IV

O 43.8: Talk

Wednesday, March 20, 2024, 12:15–12:30, MA 004

Three-spin model for Dy atom adsorbed on graphene/Ir(111) — •Jindrich Kolorenc — Institute of Physics (FZU), Czech Academy of Sciences, Prague, Czech Republic

The inelastic electron tunneling spectroscopy (IETS) revealed that rare-earth atoms adsorbed on graphene/Ir(111) carry magnetic moments not only in their 4f shell but also in their valence shell(s) [1]. The measured IETS spectra can be accurately reproduced by assuming that there is one unpaired electron in the 6s orbital (or, more accurately, in some 6s–5d hybrid orbital) [1,2]. Recently, it was argued that to understand the spin dynamics in these adatoms, two separate spin-1/2 moments are needed to be present in the valence shells, probably one in the 6s orbital and one in the 5d orbitals [3]. Using theoretical modeling, we analyze what implications this additional spin has for the IETS spectra. We show that there should be one more step in the dI/dV curve in addition to those reported in [1]. Combining first-principles and empirical parameters, we estimate the energy of this additional excitation.

[1] M. Pivetta et al., Phys. Rev. X 10 (2020) 031054

[2] D. Kyvala, J. Kolorenc, https://www.dpg-verhandlungen.de/ year/2023/conference/skm/part/o/session/33/contribution/6

[3] A. Curcella et al., Phys. Rev. Lett. 130 (2023) 106702

Keywords: inelastic electron tunneling; single-atom magnets; 4f magnetism; STM-STS; theory