Infrared spectra of the one-dimensional quarter-filled Wigner lattice compounds delta-(EDT-TTF-CONMe2)(2)X (X = AsF6, Br): Domain-wall excitations

TitreInfrared spectra of the one-dimensional quarter-filled Wigner lattice compounds delta-(EDT-TTF-CONMe2)(2)X (X = AsF6, Br): Domain-wall excitations
Type de publicationArticle de revue
AuteurAntal, Ágnes, Knoblauch, T., Dressel, Martin, Batail, Patrick , Drichko, Natalia
TypeArticle scientifique dans une revue à comité de lecture
Année2013
LangueAnglais
Date02/2013
Numéro7
Volume87
Titre de la revuePhysical Review B
ISSN1098-0121
Mots-clésorganic conductors
Résumé en anglais

Optical investigations of quarter-filled charge ordered insulators delta-(EDT-TTF-CONMe2)(2)X, X = AsF6, Br are reported. The spectra evidence the one-dimensional nature of the systems at all temperatures. The charge order exists already at room temperature, the optical gap is estimated to be of the order of 550 cm(-1) for the X = Br compound and about 700 cm(-1) for the X = AsF6 material. The optical response in the direction of the stacks is discussed in terms of domain-wall excitations of one-dimensional quarter-filled Wigner lattice at moderate values of nearest-neighbor electronic repulsion. A similarity between the effects of temperature contraction and chemical pressure is found.

URL de la noticehttp://okina.univ-angers.fr/publications/ua2672
DOI10.1103/PhysRevB.87.075118