Visualization of the Molecular Jahn-Teller Effect in an Insulating K 4 C 60 Monolayer
- 21 October 2005
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 310 (5747) , 468-470
- https://doi.org/10.1126/science.1117303
Abstract
We present a low-temperature scanning tunneling microscopy (STM) study of K x C 60 monolayers on Au(111) for 3 ≤ x ≤ 4. The STM spectrum evolves from one that is characteristic of a metal at x = 3 to one that is characteristic of an insulator at x = 4. This electronic transition is accompanied by a dramatic structural rearrangement of the C 60 molecules. The Jahn-Teller effect, a charge-induced mechanical deformation of molecular structure, is directly visualized in the K 4 C 60 monolayer at the single-molecule level. These results, along with theoretical analyses, provide strong evidence that the transition from metal to insulator in K x C 60 monolayers is caused by the Jahn-Teller effect.Keywords
This publication has 25 references indexed in Scilit:
- Band Structure and Fermi Surface of Electron-Doped C 60 MonolayersScience, 2003
- Molecular Structure, Orientational Order, and Jahn−Teller Distortion of the C604- Anion in Cs4C60Chemistry of Materials, 2002
- Metal-Insulator Transitions: Influence of Lattice Structure, Jahn-Teller Effect, and Hund's Rule CouplingPhysical Review Letters, 2000
- Electronic structure ofJoint effect of electron correlation and vibronic interactionsPhysical Review B, 1999
- Nonmagnetic molecular Jahn-Teller Mott insulatorsPhysical Review B, 1997
- Electron-vibron interactions in charged fullerenes. II. Pair energies and spectraPhysical Review B, 1994
- Ordered Structure of a Distorted C602- Fulleride IonJournal of the American Chemical Society, 1994
- Evidence for endohedral muonium inand consequences for electronic structurePhysical Review Letters, 1992
- Orientation ofclusters in solidsPhysical Review Letters, 1991
- Superconductivity at 18 K in potassium-doped C60Nature, 1991