LA-139 NUCLEAR-QUADRUPOLE RESONANCE AND RELAXATION IN ZN-DOPED LA2CUO4

La-139 nuclear quadrupole resonance and relaxation measurements, aimed at the study of static magnetic properties and of the dynamical gener alized susceptibility in La2Cu1-xZnxO4, upon substitution of Zn2+ (S = 0) for Cu2+ (S = 1/2) inducing a spin vacancy in the antiferromagneti c matrix, are presented. From the doublet resulting from the mixed Zee man-quadrupolar eigenstates, it is shown how the sublattice magnetizat ion is only slightly x dependent, while its temperature dependence cha nges with respect to pure La2CuO4. The relaxation rates show moderate (compared to the case of itinerant spin vacancies, as in La2-xSrxCuO4) effects, which are related to the decrease of the correlation length and to the modifications induced in the spin-wave spectrum.