  Evidence is presented from NMR 1/T1T and ARPES data for the sudden
disappearance of 2D antiferromagnetic (AF) correlations in the lightly
overdoped region (p=0.19) at the T=0 metal-insulator transition where the
pseudogap energy falls to zero. AF fluctuations thus appear to be intimately
associated with the pseudogap and serve primarily to weaken superconductivity,
strongly reducing the condensation energy and superfluid density.
