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O: Fachverband Oberflächenphysik

O 70: Poster: Spins on Surfaces & Surface Magnetism

O 70.4: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

Non-contact layer stabilization of azafullerene radicals: route towards high-spin-density surfaces — Yuri Tanuma^1,2, Gregor Kladnik^3,4, Luca Schio⁴, •Marion van Midden Mavrič¹, Bastien Anézo⁵, Erik Zupanič¹, Gregor Bavdek^4,6, Ruben Canton-Vitoria⁷, Luca Floreano⁴, Nikos Tagmatarchis⁷, Hermann A. Wegner^8,9, Alberto Morgante^4,10, Chris Ewels⁵, Dean Cvetko^1,3,4, and Denis Arčon^1,3 — ¹Jožef Stefan Institute, Ljubljana, Slovenia — ²CAREM, Hokkaido University, Sapporo, Japan — ³Faculty of Mathematics and Physics, University of Ljubljana, Slovenia — ⁴CNR-IOM. Trieste, Italy — ⁵IMN, Nantes, France — ⁶Faculty of Education, University of Ljubljana, Slovenia — ⁷Theoretical and Physical Chemistry Institute, Athens, Greece — ⁸Institute of Organic Chemistry, Giessen, Germany — ⁹Center for Materials research, Giessen, Germany — ¹⁰Physics department, University of Trieste, Italy

Organic radicals offer a promising qubit platform. Despite them usually being unstable, as their unpaired electrons are highly reactive, they can be stabilized via weak interactions with the surface.

We study C₅₉N^• deposited on Au(111) in UHV at molecular coverage up to 2ML. Using NEXAFS and STM we show that single azafullerenes are indeed deposited on the surface. Together with DFT calculations, NEXAFS/XPS allows us to identify the spectroscopic fingerprint of the molecular radical state. The binding of C₅₉N^• changes as a function of coverage. We identify a novel intermediate high-spin-density state between 1ML and 2ML.

Keywords: azafullerene; radical; scanning tunneling microscopy; NEXAFS; density functional calcualtions