Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 7: Clusters II: Non-Metal Clusters, Fullerenes, Nanotubes (joint session A and MO)
A 7.9: Vortrag
Dienstag, 3. April 2001, 17:45–18:00, H1012
A Metallic Endohedral Fullerene: La@C60 — •Rainer Klingeler, Gunther Kann, Ingo Wirth, Paul Siegfried Bechthold, Stefan Eisebitt, Matthias Neeb, and Wolfgang Eberhardt — Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, 52425 Jülich, Germany
Endohedrally doped C60 fullerenes on highly oriented pyrolytic graphite (HOPG) have been produced by deposition from a mass selected cluster ion beam [1]. We have investigated the density of electronic states near the Fermi level of individual La@C60 and C60 clusters using scanning tunneling spectroscopy (STS) [2]. We show that for endohedral La@C60 on HOPG the band gap at room temperature is zero. Temperature-dependent STS reveals the reversible opening of a 40 mV-gap in an individual La@C60 cluster near 28 K. Our results open the door for tailoring a manifold of new composite metal-fullerene materials with adjustable electronic properties due to the large number of endohedral fullerenes that can be deposited in situ from a mass selected cluster beam.
[1] R. Klingeler, P.S. Bechthold, M. Neeb, W. Eberhardt, J. Chem. Phys. 113, 1420 (2000); M. Neeb, R. Klingeler, P.S. Bechthold, G. Kann, I. Wirth, S. Eisebitt, W. Eberhardt, Appl. Phys. A, in press
[2] R. Klingeler, G. Kann, I. Wirth, S. Eisebitt, P.S. Bechthold, M. Neeb, W. Eberhardt, submitted to Nature