S. Charfikaddour et M. Heritier, BCS THEORY AND ISOTOPE EFFECT OF QUASI-ZERO-DIMENSIONAL SUPERCONDUCTORS NEAR THE MOTT TRANSITION, Synthetic metals, 57(2-3), 1993, pp. 4225-4230
We calculate the B.C.S superconducting critical temperature of weakly
coupled molecular levels as a function of the bandwidth B when the Deb
ye energy omega(D) has the same order of magnitude is B, a case corres
ponding to the Fullerenes, where B approximately 0.3 eV. For such a na
rrow band, electron correlations should induce a pseudogap in the dens
ity of states, leading to unusual behaviour of various quantities such
as the isotope effect. These singular properties might disappear unde
r strong enough pressure.