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DS: Fachverband Dünne Schichten

DS 32: Spins in organics

DS 32.8: Vortrag

Mittwoch, 18. März 2015, 18:15–18:30, H 0111

Transfering spin into an extended π-orbital of a large molecule — •T. Esat¹, T. Deilmann², B. Lechtenberg³, C. Wagner¹, P. Krüger², R. Temirov¹, F.B. Anders³, M. Rohlfing², and F.S. Tautz¹ — ¹Peter Grünberg Institute (PGI-3), FZ Jülich, Germany — ²Institut für Festkörpertheorie, Universität Münster, Germany — ³Lehrstuhl für Theoretische Physik II, TU Dortmund, Germany

The electronic and magnetic properties of molecules can be tuned in a wide range by charge transfer from molecules[1] and metal surfaces[2-4] or by doping with atoms[5].

In this work we tune the electronic structure by doping archetypal organic molecules with single metal atoms. An on-surface chemical reaction leads to electron spin transfer into a π-orbital that extends over the whole molecule, unlike in common molecular magnets where the spin usually resides in a d- or f-orbital of a metal ion that is shielded by organic ligands. We show that this complex has an unpaired spin which interacts with electrons in the metallic substrate and forms a Kondo singlet state. The advantage of such a radical may lie in its propensity to interact magnetically with its neighbours, offering the potential to harness this coupling.
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