Berlin 2001 – scientific programme
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A: Atomphysik
A 7: Clusters II: Non-Metal Clusters, Fullerenes, Nanotubes (joint session A and MO)
A 7.10: Talk
Tuesday, April 3, 2001, 18:00–18:15, H1012
Scanning tunneling spectroscopy of endohedrally doped fullerenes — •Ingo Wirth, Rainer Klingeler, Gunther Kann, Stefan Eisebitt, Paul Siegfried Bechthold, Matthias Neeb, and Wolfgang Eberhardt — Forschungszentrum Jülich, Institut für Festkörperforschung, 52425 Jülich, Germany
C60 and endohedrally doped fullerenes (Ce@C60 and La@C60) are isolated by mass selection of a cluster ion beam and deposited on HOPG [1]. A scanning tunneling microscope (STM) is used to locate the fullerenes and to study their band gaps. We find that Ce@C60 and La@C60 have considerably smaller band gaps than pristine C60 [2]. For La@C60 even metallic behaviour and a zero band gap is observed at room temperature. The differences in the electronic properties of Ce@C60 and La@C60 might arise from a different filling of the t1u-derived orbital whose degenerancy is lifted under the Jahn-Teller effect.
[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, Nature submitted