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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 | Abstract: | We 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 | Services: | Forum | Review | Favorites |
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