Verlag des Forschungszentrums Jülich

JUEL-3834
Kann, Gunther H.
Rastertunnelmikroskopie und -spektroskopie an deponierten Einzelfullerenen: C60, Ce@C60 und La@C60
92 S., 2000



In this PhD thesis the electronic property of a C₆₀-fullerenes, pure and endohedral doped with Ce and La, has been measured on individual molecules. C₆₀, Ce@C₆₀ und La@C₆₀ were produced in a pulsed laser vaporization cluster source, deposited on HOPG, and examined topographically and spectroscopically with a scanning tunnel microscope. It is shown that Ce@C₆₀ has a reduced band gap in contrasting to pure C₆₀. La@C₆₀ even exhibits a vanishing bandgap. The I(V)-curve identifies La@C₆₀ to be metallic-like while C₆₀ and Ce@C₆₀ show semiconducting character. Moreover La@C₆₀ shows a reversible opening of a band gap of 40 meV at a transition temperature of 28 K ± 1 K. The disappearing of the tunneling current at temperatures under 28 K could be explained with the freezing of lanthaniums movement in the C₆₀-Fullerene.

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