Figure 1: Pairing in the presence of a PG.

(a) The uniform static spin susceptibility χ(q=0, T) versus temperature for 〈n〉=0.92 t′=−0.15 and U=7 peaks at a temperature T*=0.22 and decreases below this as the PG opens. (b) The leading eigenvalue λ_d(T) of the particle–particle Bethe–Salpeter equation versus temperature (circles) from a DCA calculation of the irreducible particle–particle vertex . The d-wave eigenvalue for the spin–fluctuation interaction (equation (2)) with χ(q, ω_m) the RPA spin susceptibility from equation (8) and ==6.7 is shown as solid squares. The solid lines are guides to the eye.