Charge-ordering phenomena have been highly topical over the last few years. A phase transition towards a charge ordered state has been observed experimentally in several classes of materials. Among them, many studies have been devoted to the family of quasi-one dimensional organic charge-transfer salts (TMTTF)2X, where (TMTTF) stands for tetramethyltetrathiafulvalene and X for a monovalent anion (X = PF6, AsF6 and SbF6). However, the relationship between the electron localization phenomena and the role of the lattice distortion in stabilizing the charge-ordering pattern is poorly documented in the literature. Here we present a brief overview of selected literature results with emphasis placed on recent thermal expansion experiments probing the charge-ordering transition of these salts.
@article{arxiv.1307.7040,
title = {Charge-Ordering Transition in (TMTTF)$_2$X Explored via Dilatometry},
author = {Mariano de Souza and Jean-Paul Pouget},
journal= {arXiv preprint arXiv:1307.7040},
year = {2013}
}