F. Aryasetiawan (a), O. Gunnarsson (a), E. Koch (b) and R.M. Martin (b)
(a) Max-Planck-Institut für Festkörperforschung, Stuttgart
(b) Department of Physics, University of Illinois, Urbana, Illinois 6180
The Pauli susceptibility of A3C60 (A= K, Rb) compounds is calculated. A lattice quantum Monte Carlo method is applied to a multi-band Hubbard model, including the on-site Coulomb interaction U. It is found that the many-body enhancement of the susceptibility is of the order of a factor of three. This reconciles estimates of the density of states from the susceptibility with other estimates. The enhancement is an example of a substantial many-body effect in the doped fullerenes.
Phys. Rev. B 55, R10165 (1997).
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