Charge fluctuations and electron–phonon coupling in organic charge-transfer salts with neutral–ionic and Peierls transitions
The first-order transition of the charge-transfer complex tetrathiafulvalene–chloranil (TTF–
CA) is both a neutral–ionic (NIT) and a Peierls transition. In related organic charge-transfer
complexes, cooling at ambient pressure increases the ionicity ρ in strikingly different ways,
and is sometimes accompanied by a dielectric peak, that we relate to lattice stiffness, to
structural and energetic disorder, and to the softening of the Peierls mode in the far-IR. The
position operator P for systems with periodic boundary conditions makes possible a …
CA) is both a neutral–ionic (NIT) and a Peierls transition. In related organic charge-transfer
complexes, cooling at ambient pressure increases the ionicity ρ in strikingly different ways,
and is sometimes accompanied by a dielectric peak, that we relate to lattice stiffness, to
structural and energetic disorder, and to the softening of the Peierls mode in the far-IR. The
position operator P for systems with periodic boundary conditions makes possible a …
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