Hole Superconductivity: the Strong Coupling Limit

Physica C 161, 185 (1989) (E) Physica C 218, 504 (1993)

A Hamiltonian describing hole superconductivity is studied in the limit where the single particle hopping amplitude $t$ goes to zero. It is shown that superconductivity can occur in this regime with purely repulsive Coulomb interactions, similarly to what occurs in the weak coupling case. The critical temperature remains finite as $t\rightarrow 0$. No bound pairs exist above Tc except for extremely low hole density of holes, and above Tc holes are localized.