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.

4 pages, 4 figures

References in corpus (2)

• Dielectric response of modified Hubbard models with neutral-ionic and Peierls transitions
• Giant infrared intensity of the Peierls mode at the neutral-ionic phase transition

Cited by in corpus (6)

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• Bond order wave (BOW) phase of the extended Hubbard model: Electronic solitons, paramagnetism, coupling to Peierls and Holstein phonons
• Effects of Lattice and Molecular Phonons on Photoinduced Neutral-to-Ionic Transition Dynamics in Tetrathiafulvalene-$p$-Chloranil
• 1:1 alkali-TCNQ salts and the bond order wave (BOW) phase of half-filled linear Hubbard-type models
• The excitonic insulator route through a dynamical phase transition induced by an optical pulse
• Inhomogeneous Evolution of a Dense Ensemble of Optically Pumped Excitons to a Charge Transfer State