Scaling behavior of the longitudinal and transverse transport in quasi-one-dimensional organic conductors

We report on dc and microwave experiments of the low-dimensional organic conductors (TMTSF)(2)PF(6) and (TMTSF)(2)ClO(4) along the a, b', and c* directions. In the normal state of (TMTSF)(2)PF(6) below T=70 K, the dc resistivity follows a power law with rho(alpha) and rho(b') proportional to T(2) while rho(c)*proportional to TY, T. Above T=100 K the exponents extracted from the data for the a and c* axes are consistent with what is to be expected for a system of coupled one-dimensional chains (Luttinger liquid) and a dimensional crossover at a temperature of about 100 K. The b' axis shows anomalous exponents that could be attributed to a large crossover between these two regimes. The contactless microwave measurements of single crystals along the b' axis reveal an anomaly between 25 and 55 K which is not understood yet. The organic superconductor (TMTSF)(2)ClO(4) is more a two-dimensional metal with an anisotropy rho(alpha)/rho(b'), of approximately 2 at all temperatures. Such a low anisotropy is unexpected in view of the transfer integrals. Slight indications to one-dimensionality are found in the temperature dependent transport only above 200 K. Even along the least conducting c* direction no region with semiconducting behavior is revealed up to room temperature.