ONE-DIMENSIONAL ELECTRONIC-PROPERTIES OF THE BECHGAARD SALTS

An estimate of the gap DELTA(rho) that opens at the Fermi level in a 3 /4-filled Hubbard model with alternating hopping integrals is obtained on the basis of weak and strong coupling results. Assuming that this gap will induce a minimum of resistivity at a temperature T(rho) congr uent-to DELTA(rho)/pi, we show that the hopping integrals provided by quantum chemistry calculations based on structural data are in reasona ble agreement with the experimental resistivity curves if U is the sam e for all compounds (congruent-to 850meV). In particular, very small v alues can be obtained for the TMTSF series without assuming that the d imerization is itself very small. The discrepancies between this model and the magnetic data are briefly discussed.