Microwave transport approach to the coherence of interchain hopping in (TMTSF)(2)PF6

We report a microwave study of the longitudinal and transverse transport pr operties of the quasi-one-dimensional organic conductor (TMTSF)(2)PF6 in it s normal phase. The contactless technique have provided a direct measuremen t of the temperature profile of the resistivity along the b' direction and in magnetic: fields up to 14 T. A characteristic energy scale (T-x similar to 40 K) has been observed which delimits a transient regime from art insul ating: to a metallic behavior. This anomalous profile is discussed in terms of the onset of coherent transport properties along the b' direction below 40 K. This is also supported by the observation of a finite longitudinal a nd transverse magnetoresistances only below 40 K indicative of a two-dimens ional regime. Below T-x, however; strong deviations with respect to a Fermi liquid behavior are evidenced.