Anisotropic nuclear relaxation in YBa sub 2 Cu sub 3 O sub 7 -II.

Planar-site sup 63 Cu nuclear spin-lattice relaxation data are presented for a magnetically oriented sample of YBa sub 2 Cu sub 3 O sub 7 microcrystallites at temperatures 86K = T = 290K and with the collective c-axis at theta = O and pi/2 relative to the applied field. These results yield a relaxation anisotropy in good agreement with our previous data. The anisotropy exhibits a small temperature dependence, suggesting the presence of dynamical correlations among the Cu(2) 3d-spins.