| Issue |
J. Phys. IV France
Volume 114, April 2004
|
|
|---|---|---|
| Page(s) | 91 - 94 | |
| DOI | https://doi.org/10.1051/jp4:2004114017 | |
J. Phys. IV France 114 (2004) 91
DOI: 10.1051/jp4:2004114017
Spatially resolved tunneling spectroscopy on TTF-TCNQ
Z.Z. Wang1, J.C. Girard1, C. Pasquier2 and D. Jérome21 Laboratoire de Photonique et de Nanostructures (CNRS U.P.R 020), Route de Nozay, 91460 Marcoussis, France
2 Laboratoire de Physique des Solides (CNRS U.R.A. 8502), Bâtiment 510, Université de Paris-Sud, 91405 Orsay, France
Abstract
Local tunneling spectroscopy has been measured with low
temperature UHV-STM on in-situ cleaved ab surface of organic TTF-TCNQ crystal.
Due to ultra low image drift and clear molecular resolution, the
spectroscopy is performed at specific molecular site either on TCNQ or TTF
chains. In normal state (T= 63 K), a large pseudo-gap exists both in TTF and
TCNQ chains. Above pseudo-gap local density of states differs for TTF and
TCNQ chains that is in good agreement with double band model. By the
signature of an anomalous in local spectroscopy measurement, a single
impurity has been detected on a TTF chain. Charge density wave fluctuation
is pinned by impurity above critical temperature (T=54K). Results obtained
show that, Scanning Tunneling Spectroscopy can provide spatially resolved
spectroscopic information at nanometer scale.
Key words. TTF-TCNQ, local tunneling spectroscopy, pseudogap.
© EDP Sciences 2004