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O: Fachverband Oberflächenphysik
O 70: Poster: Spins on Surfaces & Surface Magnetism
O 70.1: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster C
Weakly coupled S=1/2 molecules on a superconductor — •Vivek Krishnakumar Rajathilakam1, Nicolaj Betz1, Lukas Arnhold1, Matteo Briganti2, Lorenzo Poggini4, Jaisa Fernandez Soarez5, Luana C. De Camargo5, Giulia Serrano3, Matteo Mannini2, Federico Totti2, Roberta Sessoli2, Susanne Baumann1, and Sebastian Loth1 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Department of Chemistry Ugo Schiff, University of Florence, Italy — 3Department of Industrial Engineering, University of Florence, Italy — 4Institute of Chemistry of Organometallic Compounds - CNR, Florence, Italy — 5Department of Chemistry, Federal University of Paraná, Brazil
Sandwich complexes hosting a transition metal ion can show magnetic properties of great interest for quantum information processing [1]. Here we study an S=1/2 organometallic sandwich CpTi(cot), with very long coherence times in frozen solution [2]. We use a Scanning Tunneling Microscope (STM) at 50 mK to measure the properties of individual CpTi(cot) molecules adsorbed on a superconducting vanadium surface V(100) with oxygen reconstruction. It shows no Yu-Shiba-Rusinov states, but prominent S=1/2 spin excitations can be traced up to 15 T. They show spin-spin interactions for molecules with separation up to 1.4 nm. These results show a promising step towards using molecules on superconductors for molecular qubit applications. [1] AM. Ariciu, et al. Nat Commun 10, 3330 (2019) [2] L.C. de Camargo, et al. Angew. Chem., Int. Ed., 60, 2588 (2021)
Keywords: Scanning tunneling microscopy; Inelastic electron tunneling spectroscopy; Magnetic molecules; Superconductors; Magnetic impurity