SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 50: Spins on Surfaces at the Atomic Scale IV
O 50.3: Vortrag
Mittwoch, 29. März 2023, 11:00–11:15, REC C 213
Robust Monolayers of Endohedral Fullerenes: Towards Highly Ordered Arrays of Single Molecule Magnets and Spin Qubits — •Lukas Spree1, Luciano Colazzo1, Caroline Hommel1, Andreas Heinrich1, and Alexey Popov2 — 1IBS Center for Quantum Nanoscience, Seoul, South Korea — 2Leibnitz Institute for Solid State and Materials Research
In 2012 DySc2N@C80 was the first endohedral fullerene proven to be a single molecule magnet. Ten years and many fullerene based single molecule magnets later, lanthanide dimetal fullerenes show high blocking temperatures of magnetization approaching 30 K and suppression of quantum tunnelling of magnetization at zero magnetic field due to coupling of two magnetic moments via an electron in a singly occupied molecular orbital. The isostructural non-magnetic versions of these molecules with Y or Sc dimers show long T2 times and might be promising candidates for spin qubits. A great advantage of fullerene based molecules is their exceptional chemical stability.
For future research the deposition of fullerene based single molecule magnets in ordered layers is desirable to control intermolecular interactions and ease measurements with scanning probe techniques. Several causes for disorder can be identified and one approach to counteract them is chemical functionalization of the fullerene cage to promote self-assembly of monolayers. A challenge with the direct deposition of functionalized fullerenes on a substrate is a mismatch of the distance between potential binding sites and the size of the fullerenes. Therefore, templating with tetrapyrrole complexes is investigated.