Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 59: Spins on Surfaces at the Atomic Scale I
O 59.7: Talk
Wednesday, March 19, 2025, 12:00–12:15, H6
Spin-surface interactions of S=1/2 molecular magnets on superconductors — •Susanne Baumann1, Lukas Arnhold1, Nicolaj Betz1,2, Matteo Briganti3, Andrea Sorrentino4, Giulia Serrano4, Federico Totti3, Roberta Sessoli3, and Sebastian Loth1,2 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Center for Integrated Quantum Science and Technology, Stuttgart, Germany — 3Department of Chemistry 'Ugo Schiff', University of Florence, Italy — 4Department of Industrial Engineering, University of Florence, Italy
The interaction between magnetic molecules and superconducting surfaces critically depends on the electronic properties of the surface and the molecules' binding configuration, which determines the wave function overlap between molecule and surface. Using scanning tunneling microscopy (STM), we study the organometallic molecule ((η8-cyclooctatetraene)(η5-cyclopentadienyl)titanium) (CpTicot) on two different superconducting surfaces. On lead (Pb) nanoislands on Si(111), CpTicot exhibits multiple binding orientations with varying surface coupling strengths, that can be strong enough to generate Yu-Shiba-Rusinov bound states within the superconducting gap. Conversely, on vanadium (V(100)), the molecules adsorb in a single orientation with minimal coupling to the superconductor. Their spin states remain largely decoupled from the substrate, preserving their S=1/2 properties. These findings offer valuable insights into chemical design principles for molecular qubits where individual adressability and decoupling from superconducting substrates is desired.
Keywords: scanning tunneling microscopy; molecular magnets; spins on surfaces; superconductivity; bound states