Peierls Structural Transition in Organic Crystals of TTF-TCNQ in the 3D Model

Abstract

Peierls transition in organic crystals of TTF-TCNQ type is studied in 3D approximation. For a more complete description of the crystal model, two the most important electronphonon interactions are considered. The transition behavior is investigated in different cases, when the conduction band is filled up to a quarter of the Brillouin zone and the dimensionless Fermi momentum kF = /4 and when the carrier concentration varies and kF = /4 ± δ, where δ represents the variation of the Fermi momentum, kF. In all cases the critical temperature of the transition is determined.