Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 6: Surface magnetism and magnetic coupling phenomena (joint session MA/O/TT)
TT 6.2: Talk
Monday, April 1, 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 Loth1,2,3 — 1Institute 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