Abstract
139La nuclear quadrupole resonance and relaxation measurements, aimed at the study of static magnetic properties and of the dynamical generalized susceptibility in La2Cu1−xZnxO4, upon substitution of Zn2+ (S=0) for Cu2+ (S=1/2) inducing a spin vacancy in the antiferromagnetic matrix, are presented. From the doublet resulting from the mixed Zeeman-quadrupolar eigenstates, it is shown how the sublattice magnetization is only slightly x dependent, while its temperature dependence changes 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.
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