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Phys Rev Lett. 2006 May 26;96(20):205503. Epub 2006 May 24.

One-dimensional fluctuating nanodomains in the charge-transfer molecular system TTF-CA and their first-order crystallization.

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Groupe Matière Condensée et Matériaux, UMR 6626 CNRS-Université Rennes 1, 35042 Rennes, France.


We report on the direct observation by x-ray diffuse scattering measurements of thermally induced one-dimensional nanoscale ordered fluctuations in the mixed-stack charge-transfer molecular system tetrathiafulvalene-p chloranil (TTF-CA), the prototype for the neutral-ionic phase transition. The unusual physical properties of this compound are considered to be driven by such one-dimensional excitations. The results are discussed in relation to previous experimental and theoretical experiments both at thermal equilibrium and under light irradiation.

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