Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 65: Poster: Molecular Nanostructures on Surfaces
O 65.17: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster C
On-surface synthesis of nanographenes on proximitized superconducting substrates. — •Katerina Vaxevani1, Dongfei Wang1, Stefano Trivini1, Jon Ortuzar1, and Jose Ignacio Pascual1,2 — 1CIC nanoGUNE-BRTA, 20018 Donostia-San Sebastian, Spain — 2Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
Exploring molecular magnetism on superconducting substrates has the advantage over atomic spins of selectively tuning the exchange interaction with the underlying substrate. However, most elemental superconductors have highly reactive surfaces which result in the decomposition of the molecular species upon adsorption. To tackle this problem, we fabricated a metallic proximitized superconducting platform to achieve on-surface synthesis of molecular nanostructures while maintaining the superconducting properties of the substrate. First, we focused on the growth of Ag on a Nb(110) single crystal, where we find 20nm-high superconducting Ag(111) islands. There, we deposited the 2OS radical molecules to study the interaction of the molecular spin with the substrate. Additionally, we realized on-surface synthesis of the triangulene chains, previously reported only for an Au(111) pristine surface. A clear magnetic fingerprint, manifested as in-gap Yu-shiba-rusinov states, is found in some triangulene units probably because of intrinsic defects in the formation of the chains, while regular formed chains show no magnetic signal. Finally, we show our next approach for the ideal platform to study spin physics of extended pi-conjugated molecular systems.
Keywords: Proximity; Superconductors; On-surface synthesis; Molecular chains; Superconducting gap