title: Anomalous dispersion of optical phonons at the neutral-ionic transition: evidence from diffuse x-ray scattering.
abstract: Diffuse x-ray data for mixed-stack organic charge-transfer crystals approaching the neutral-ionic phase transition can be quantitatively explained as due to the softening of the optical phonon branch. The interpretation is fully consistent with vibrational spectra, and underlines the importance of electron-phonon coupling in low-dimensional systems with delocalized electrons.
authors.affiliation: Dipartimento di Chimica GIAF, Parma University, & INSTM UdR Parma, 43100 Parma, Italy.
authors.forename: Gabriele
authors.initials: G
authors.lastname: D'Avino
authors.forename: Alberto
authors.initials: A
authors.lastname: Girlando
authors.forename: Anna
authors.initials: A
authors.lastname: Painelli
authors.forename: Marie-Hélène
authors.initials: MH
authors.lastname: Lemée-Cailleau
authors.forename: Zoltán G
authors.initials: ZG
authors.lastname: Soos