CHARGE-DENSITY-WAVE SEMIMETALLIC AND SUPERCONDUCTING STATES FOR A3C60

It is shown that the attractive Hubbard model for the face-centered-cu bic lattice possesses a charge-density-wave semimetallic phase with a superconducting ground state. The properties of this phase are consise nt with the behavior of alkali fullerides. The overlapping bands resul t in peaks in the density of states and anomalous mid-infrared absorpt ion. The low density of carriers leads to a high normal-state resistiv ity, a short coherence length and a long penetration depth, as observe d. The difference between this and a spin-density-wave semimetallic st ate, which is predicted to occur in the repulsive Hubbard model, is br iefly discussed.