Abstract
Two kinds of superstructures were found at ∼280 K by scanning tunneling microscopy on the crystal surface of β-(BEDT-TFF, a quasi-one-dimensional organic conductor with a metal-insulator phase transition at ∼297 K. One has a structural modulation which is perpendicular to the one-dimensional conductive axis, similar to that previously observed on a TTF-TCNQ crystal surface. The other has a twofold periodicity along the one-dimensional conductive axis, as expected from the theory. Under the assumption that the former is an intermediate structure caused by the interaction between neighboring one-dimensional molecular chains, superstructures which have been observed in BEDT-TTF compounds could be explained well.
- Received 30 May 1995
DOI:https://doi.org/10.1103/PhysRevB.52.16361
©1995 American Physical Society