Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 87: Poster Session - Nanostructures at Surfaces: 1D and 2D Structures and Networks
O 87.7: Poster
Wednesday, March 18, 2020, 18:15–20:00, P2/1OG
Electronic and magnetic structure of oriented sandwich-molecular wires on graphene/Ir(110) — •Stefan Kraus1, Alexander Herman2, Felix Huttmann1, Ken Bischof1, Nico Rothenbach2, Katharina Ollefs2, Marco Bianchi4, Raluca-Maria Stan4, Ann Julie Holt4, Jan Dreiser5, Shigeru Tsukamoto3, Nicolae Atodiresei3, Philip Hofmann4, Heiko Wende2, and Thomas Michely1 — 1Universität zu Köln, Germany — 2Universität Duisburg-Essen, Germany — 3Forschungszentrum Jülich, Germany — 4Aarhus university, Denmark — 5Paul Scherrer Institut, Switzerland
Sandwich-molecular wires are one-dimensional arrangements of alternating metal atoms and cyclic molecules which, when synthesized on a surface, can interlock with each other and form islands. Here, we use europium as metal reactant and cyclooctatetraene as ligand. We choose the substrate Gr/Ir(110) which has a two-fold symmetric moiré, in order to achieve a global wire orientation. Excluding defects we observe wire formation only along the [001] direction, which allows for band structure investigations using ARPES. Although it is not possible to observe the π-derived bands, we find a flat band stemming from the 4f-states. The comparison with DFT calculations allows us to estimate the Hubbard U for the wires. While XMCD for these wires on Gr/Ir(111) shows a hyteresis at 5K, this hysteresis is suppressed in the oriented wires on Gr/Ir(110). We speculate that the more reactive binding of Gr/Ir(110) leads to this suppression, while the electronic configuration of Eu 4f7 is left unchanged.