Abstract
Exact ground states of a generalized model for strongly correlated heavy-fermion systems in d dimensions are studied. By the optimal ground state approach it is shown that the model has superconducting ground states via the η-pairing mechanism. Superconductivity of this type can coexist with various kinds of magnetism (paramagnetic, Néel-ordered, and ferromagnetic). Criteria for the stability of the charge-density-wave states are also obtained.
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