Volume 57, Number 1, January 2002
|Page(s)||67 - 73|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Direct evidence of lattice-relaxed charge transfer exciton strings
Laboratoire Léon Brillouin, CEA/CNRS - F-91191 Gif-sur-Yvette Cedex, France
2 Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université Rennes 1 F-35042 Rennes Cedex, France
3 Laboratoire de Physique des Solides, Université Paris-sud F-91405 Orsay, France
4 Institute of Physical and Theoretical Chemistry, Technical University of Wroclaw PL-50-370 Wroclaw, Poland
5 Laboratoire de Cristallographie/ESRF, CNRS BP 166 F-38042 Grenoble cedex 09, France
6 Institute of Physics, Adam Mickiewicz University PL-61-614 Poznań, Poland
7 Physikalisches Institut, Universität Stuttgart D-70550 Stuttgart, Germany
Accepted: 23 October 2001
We report first direct evidence, by X-ray diffuse scattering, of lattice-relaxed charge transfer exciton strings, which are one-dimensional self-trapped multiadjacent excitons. These non-linear excitations are key objects in quasi–one-dimensional organic compounds that undergo the neutral-ionic transition and are responsible for their physical properties. The one-dimensional fluctuations are very well described within the framework of the transfer integral method and physical parameters are deduced from both X-ray and dielectric measurements.
PACS: 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 71.30.+h – Metal-insulator transitions and other electronic transitions / 77.22.-d – Dielectric properties of solids and liquids
© EDP Sciences, 2002
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