MAGNETIC AND PAIRING CORRELATIONS IN COUPLED HUBBARD PLANES

We use quantum Monte Carlo simulations to calculate the magnetic and p airing correlations of two-dimensional Hubbard sheets coupled by an in terlayer hopping t(perpendicular to). We find that large t(perpendicul ar to) reduces in-plane magnetic correlations despite the increased la ttice coordination, and also see evidence for a crossover to a spin-li quid phase where there is no long-range magnetic order in the ground s tate. Superconducting correlations are reduced by the interlayer coupl ing at the temperatures accessible to the simulations.