Abstract
We have thoroughly characterized the surfaces of the organic charge-transfer salts TTF-TCNQ and which are generally acknowledged as prototypical examples of one-dimensional conductors. In particular x-ray-induced photoemission spectroscopy turns out to be a valuable nondestructive diagnostic tool. We show that the observation of generic one-dimensional signatures in photoemission spectra of the valence band close to the Fermi level can be strongly affected by surface effects. Especially, great care must be exercised taking evidence for an unusual one-dimensional many-body state exclusively from the observation of a pseudogap.
- Received 9 September 2002
DOI:https://doi.org/10.1103/PhysRevB.67.125402
©2003 American Physical Society