Physical Properties of One Dimensional Conductors

Abstract

In the course of investigations of organic metals we have investigated the cation-radical series TMTTF₂-X′ with X′ = BF₄, ClO₄, PF₆, SCN and Br. On this isomorphous series a large range of physical properties have been studied: electrical conductivity, magnetic susceptibility, EPR, optical reflectivity and specific heat. In correlation with crystallographic results, which indicate the existence of TMTTF diads, the dominant interactions are analyzed. It results that the metallic behavior at high temperatures and the occurrence of a Peierls distorsion below 100 K arise mainly from a competition between electron-electron and electron-phonon coupling inside the cation-radical chains