Nonadiabatic high-Tc superconductivity in hole-doped fullerenes

Inthispaperweaddressthepossibilityofhigh-T csuperconductivity( T c ? 100K)inhypotheticalhole doped C60 within the context of the nonadiabatic theory of superconductivity. Our analysis shows that electron doped fullerenes, represented by the A3C60 family, are characterized by relatively small values of the electron- phonon coupling constant ?, which can thus be further increased by hole doping before lattice instabilities occur. In particular we show that Tc larger than 100 K are compatible in the nonadiabatic context with microscopic parameters ?h?0.5-1.0, ?*?0.3-0.5 and phonon frequencies ?ph?1500-2000K. These re- sults provide a stimulus for material engineering and optimization along the lines indicated.