Comprehensive transport studies of anisotropy and ordering phenomena in quasi-one-dimensional (TMTTF)2X salts (X = PF6, AsF6, SbF6; BF4, ClO4, ReO4)

TL;DR

This study investigates the temperature-dependent electrical resistivity of various (TMTTF)2X salts along all crystal directions, revealing how structural and anion effects influence anisotropy, localization, and charge ordering phenomena in these quasi-one-dimensional organic conductors.

Contribution

It provides a comprehensive analysis of transport mechanisms and the influence of different anions on the physical properties of (TMTTF)2X salts, integrating structural data and theoretical insights.

Findings

Anions significantly affect transport properties.

Different regimes exhibit distinct conduction mechanisms.

Structural properties correlate with observed anisotropy and ordering phenomena.

Abstract

The temperature dependent dc resistivity of the quasi-one-dimensional organic salts (TMTTF)2X ( X = PF6, AsF6, SbF6; BF4, ClO4, ReO4) has been measured in all three crystal directions in order to investigate anisotropy, localization effects, charge and anion ordering phenomena at low temperatures. For all compounds and directions we extract the transport mechanisms in different regimes. The data are thoroughly analyzed, related to structural properties, and extensively discussed in view of previous studies and latest theories. It becomes apparent that the anions have a severe influence on the physical properties of the TMTTF salts.