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Comparing resistivity data of quasi-one dimensional superconductors(TMTSF)_2PF_6 and (TMTSF)_2ClO_4 along the least conducting c*-axis and alongthe high conductivity a -axis as a function of temperature and pressure, a lowtemperature regime is observed in which a unique scattering time governstransport along both directions of these anisotropic conductors. However, thepressure dependence of the anisotropy implies a large pressure dependence ofthe interlayer coupling. This is in agreement with the results offirst-principles DFT calculations implying methyl group hyperconjugation in theTMTSF molecule. In this low temperature regime, both materials exhibit for rc atemperature dependence aT + bT^2. Taking into account the strong pressuredependence of the anisotropy, the T-linear rc is found to correlate with thesuppression of the superconducting Tc, in close analogy with ra data. This workis revealing the domain of existence of the 3D coherent regime in the generic(TMTSF)_2X phase diagram and provides further support for the correlationbetween T-linear resistivity and superconductivity in non-conventionalsuperconductors.

The metallic transport of (TMTSF)_2X organic conductors close to the superconducting phase