Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 107: Graphene: Electronic Structure (jointly with O, HL)

TT 107.12: Talk

Thursday, March 19, 2015, 17:45–18:00, MA 041

Single 3d transition metal atoms on multi-layer graphene systems: electronic configurations, bonding mechanism and role of the substrate — Violetta Sessi⁶, Sebastian Stepanow^{1, 2}, Alexander N. Rudenko³, Sören Krotzky¹, Klaus Kern¹, Fanny Hiebel⁴, Pierre Mallet⁴, Jean-Yves Veuillen⁴, Ondřej Šipr⁵, •Jan Honolka^1,5, and Nick B. Brookes⁶ — ¹Max-Planck Institut für Festkörperforschung, Stuttgart, Germany — ²Department of Materials, ETH Zürich, Switzerland — ³Radboud University Nijmegen, Inst. for Molecules and Materials, Netherlands — ⁴Institut Néel, CNRS-UJF, Grenoble, France — ⁵Inst. of Physics, ASCR, Prague, Czech Republic — ⁶ESRF, Grenoble, France

We present our recent study on electronic configurations of Fe, Co, Ni and Cu adatoms on graphene and graphite by x-ray magnetic circular dichroism and charge transfer multiplet theory [1]. A delicate interplay between long-range interactions and local chemical bonding is found to influence the adatom equilibrium distance and magnetic moment. The results for Fe and Co are consistent with purely physisorbed species having, however, different 3d-shell occupations on graphene and graphite (dⁿ⁺¹ and dⁿ, respectively). On the other hand, for the late 3d metals Ni and Cu a trend towards chemisorption is found, which strongly quenches the magnetic moment on both substrates.

[1] V. Sessi et al., New J. of Physics 16, 062001 (2014) [Fast Track Communication]