title: Charge-ordering transition in (TMTTF)2X explored via dilatometry.
abstract: Charge-ordering phenomena have been highly topical over the past 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.
authors.affiliation: Instituto de Geociências e Ciências Exatas-IGCE, Unesp-Univ Estadual Paulista, Departamento de Física, Caixa Postal 178, 13506-900 Rio Claro (SP), Brazil. mariano@rc.unesp.br
authors.forename: Mariano
authors.initials: M
authors.lastname: de Souza
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Pouget