THEORY OF SPIN DYNAMICS IN THE METALLIC CUPRATES (INVITED)

The spin dynamics in the metallic cuprates are studied theoretically. In the normal state, it is demonstrated that the interplay of correlat ion effects and fermiology lead to a natural understanding of the cont rasting wave vector dependences in the neutron scattering cross sectio ns of the two best characterized cuprates: LaSrCuO and YBaCuO, as well as the anomalous frequency and temperature dependences in the neutron scattering cross sections and in the NMR relaxation rates 1/T-1 and 1 /T-2G In the superconducting state, the compatibility of the d-wave pa iring state with magnetic data is explored.