Anomalous dispersion of optical phonons at the neutral-ionic transition: evidence from diffuse x-ray scattering.
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.
D'Avino
Gabriele
G
Dipartimento di Chimica GIAF, Parma University, & INSTM UdR Parma, 43100 Parma, Italy.
Girlando
Alberto
A
Painelli
Anna
A
Lemée-Cailleau
Marie-Hélène
MH
Soos
Zoltán G
ZG