Charge and anion ordering phase transitions in (TMTTF)(2)X salt conductors

Authors
Nad, F Monceau, P Carcel, C Fabre, JM
Citation
F. Nad et al., Charge and anion ordering phase transitions in (TMTTF)(2)X salt conductors, J PHYS-COND, 13(29), 2001, pp. L717-L722
Citations number
26
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
09538984 → ACNP
Volume
13
Issue
29
Year of publication
2001
Pages
L717 - L722
Database
ISI
SICI code
0953-8984(20010723)13:29<L717:CAAOPT>2.0.ZU;2-H
Abstract
We report measurements of the low frequency conductivity and dielectric per mittivity of quasi-one-dimensional organic (TMTTF)(2)X salts with noncentro symmetrical anions X = ReO4 and SCN. We show that the 'structureless transi tion' at 227.5 K in (TMTTF)(2)ReO4 is due to charge ordering and has a ferr oelectric character. The anion ordering transition strongly affects the die lectric response: it suppresses the polarizability in (TMTTF)(2)ReO4 and in duces probably an antiferroelectric state in (TMTTF)(2)SCN.