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28 March 2024
 
  » pubmed » pmid16239471

 Article overview


Visualization of the molecular Jahn-Teller effect in an insulating K4C60 monolayer
A Wachowiak ; R Yamachika ; K H Khoo ; Y Wang ; M Grobis ; D-H Lee ; Steven G Louie ; M F Crommie ;
Date 21 Oct 2005
Journal Science, 310 (5747), 468-70
AbstractWe present a low-temperature scanning tunneling microscopy (STM) study of K(x)C60 monolayers on Au(111) for 3 < or = x < or = 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 C60 molecules. The Jahn-Teller effect, a charge-induced mechanical deformation of molecular structure, is directly visualized in the K4C60 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)C60 monolayers is caused by the Jahn-Teller effect.
Source PubMed, pmid16239471 doi: 10.1126/science.1117303
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