title: Charge ordering in the TMTTF family of molecular conductors
abstract: Using one- and two-dimensional NMR spectroscopy applied to 13C spin-labeled (TMTTF)2AsF6 and (TMTTF)2PF6, we demonstrate the existence of an intermediate charge-ordered phase in the TMTTF family of charge-transfer salts. At ambient temperature, the spectra are characteristic of nuclei in equivalent molecules. Below a continuous charge-ordering transition temperature T(co), there is evidence for two inequivalent molecules with unequal electron densities. The absence of an associated magnetic anomaly indicates only the charge degrees of freedom are involved and the lack of evidence for a structural anomaly suggests that charge-lattice coupling is too weak to drive the transition.
authors.affiliation: Department of Physics and Astronomy, UCLA, Los Angeles, California 90095-1547, USA.
authors.initials: DS
authors.lastname: Chow
authors.initials: F
authors.lastname: Zamborszky
authors.initials: B
authors.lastname: Alavi
authors.initials: DJ
authors.lastname: Tantillo
authors.initials: A
authors.lastname: Baur
authors.initials: CA
authors.lastname: Merlic
authors.initials: SE
authors.lastname: Brown