Rastertunnelmikroskopie und -spektroskopie an deponierten Einzelfullerenen: C$_{60}$, Ce@C$_{60}$ und La@C$_{60}$
Rastertunnelmikroskopie und -spektroskopie an deponierten Einzelfullerenen: C$_{60}$, Ce@C$_{60}$ und La@C$_{60}$
In this PhD thesis the electronic properties of a C$_{60}$-fullerenes, pure and endohedral doped with Ce and La, has been measured on individual molecules.C$_{60}$, Ce@C$_{60}$ and La@C$_{60}$ were produced in a pulsed laser vaporizationcluster source, deposited on HOPG, and examined topographically...
| Personal Name(s): | Kann, Gunther H. (Corresponding author) |
|---|---|
| Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
| Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
2000
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| Physical Description: |
92 p. |
| Document Type: |
Report Book |
| Research Program: |
Addenda |
| Series Title: |
Berichte des Forschungszentrums Jülich
3834 |
| Link: |
OpenAccess OpenAccess |
| Publikationsportal JuSER |
|
In this PhD thesis the electronic properties of a C$_{60}$-fullerenes, pure and endohedral doped with Ce and La, has been measured on individual molecules.C$_{60}$, Ce@C$_{60}$ and La@C$_{60}$ were produced in a pulsed laser vaporizationcluster source, deposited on HOPG, and examined topographically and spectroscopicallywith a scanning tunnel microscope. It is shown that Ce@C$_{60}$ hasa reduced band gap in contrasting to pure C$_{60}$. La@C$_{60}$ even exhibits a vanishingbandgap. The I(V)-curve identifies La@C$_{60}$ to be metallic-like whileC$_{60}$ and Ce@C$_{60}$ show semiconducting character. Moreover La@C$_{60}$ shows areversible opening of a band gap of 40 meV at a transition temperature of 28K $\pm$ 1 K. The disappearing of the tunneling current at temperatures under28 K could be explained with the freezing of lanthaniums movement in theC$_{60}$-Fullerene. |