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 7.10: Vortrag

Dienstag, 3. April 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 t_1u-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