Diffusive Conductivity in Quasi One-Dimensional Conductor TMTTF–TCNQ

Abstract

The temperature-dependent behavior of the conductivity σ_c perpendicular to the 1–d axis of TMTTF–TCNQ is explained in terms of diffusive hopping process between the Bloch-band electronic states of neighboring 1–d columns. It is pointed out that σ_c can be used to extract the conductivity component σ_SP ascribable to electrons in the single-particle states from the conductivity σ_b along the 1–d axis. The deviation (of about 20%) of σ_b from σ_SP around the maximum-conductivity region is ascribed to the contribution of the charge density waves.