RELAXATION OF NUCLEAR-SPIN DUE TO LONG-RANGE ORBITAL CURRENTS

We consider a model of metallic layers where transverse fluctuations in the currents in each layer produce a fluctuating magnetic field. This field relaxes a nuclear spin located anywhere in the crystal. We apply this model to an ordinary Fermi liquid, to a model of strongly correlated electrons that may be applicable to oxide superconductors, and to a metal just above its superconducting temperature.