Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Surface magnetism and magnetic coupling phenomena (joint session MA/O/TT)

MA 5.2: Vortrag

Montag, 1. April 2019, 09:45–10:00, H53

Tunable spin-superconductor coupling of spin 1/2 molecules — •Luigi Malavolti1,2,3, Matteo Briganti4, Max Hänze1,2,3, Giulia Serrano4, Irene Cimatti4, Gregory McMurtie1,2,3, Edwige Otero5, Philippe Ohresser5, Federico Totti4, Matteo Mannini4, Roberta Sessoli4, and Sebastian Loth1,2,31Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Stuttgart, Germany — 2Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — 3Max Planck Institute for Solid State Research, Stuttgart, Germany — 4Università degli Studi di Firenze, Sesto Fiorentino (Firenze), Italy — 5Synchrotron SOLEIL, Gif-sur-Yvette, France

Assemblies of magnetic molecules with long coherence time are being investigated as quantum bits that may be embedded in superconducting resonators [1]. Bringing the spin center into contact with the superconducting surface maximizes coupling to the resonator but may also reduce the spin's coherence time by increased scattering of quasi-particles. Here we report the capability to tune the exchange coupling of spin 1/2 vanadyl phthalocyanine molecules (VOPc) with a Pb superconducting surface. This system offers a fully tunable spin superconductor coupling from uncoupled spin to strongly coupled, screened spin [2]. These findings highlight the possibility to scale superconducting resonator experiments down to single molecule sensitivity.

[1] M. D. Jenkins, et al., Dalt. Trans. 2016, 45, 16682.

[2] L. Malavolti, et al., Nano Letters DOI: 10.1021/acs.nanolett.8b03921

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