Abstract
We performed STM and theoretical studies of the surface of which is known to show a metal-insulator transition at 297 K with the nesting vector of as a bulk phase. Two typical charge-density wave (CDW) phases with and were observed at 285 K on the surface. The observed structures were correlated well with the analysis of the susceptibility , given the incomplete surface-charge transfer in the polar surface of this material. This is the first observation of surface CDW phases that reflect the characteristics of the electronic structure. These results suggest the possible discovery of other surface properties, such as surface superconductivity, in organic materials with a polar surface.
- Received 2 April 1999
DOI:https://doi.org/10.1103/PhysRevLett.83.596
©1999 American Physical Society