Abstract
Microscopic magnetic properties of the CuO2 layers in YBa2Cu3O7-y have been investigated from Cu and O NMR experiments on the y≃0 (Tc=92K) and y=0.37 (Tc=62K) materials. The Knight shift at the planar Cu and the planar oxygen sites are found to be proportional to a common spin susceptibility xs which depends on temperature and oxygen-content, strongly supporting a single component spin model for the CUO2 planes. In the y=0.37 material, xs shows a significant reduction with decreasing temperature in the normal state. The nuclear relaxation rate (1/T-1) in the y≃0 material, particularly different behaviors at Cu and O sites, can be accounted for by the hyperfine coupling of Cu and O nuclei to an antiferromagnetically correlated single spin system. Quite different behaviors of 1/T1 were observed in the y=0.37 material, which might be due to combined effects of antiferromagnetic correlations and a temperature-dependent spin susceptibility.
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