Abstract
We present a theory of magnetic (Ni) and nonmagnetic (Zn) impurities substituted into planar Cu sites in the normal state of underdoped cuprates exhibiting a spin gap. Both types of impurities induce magnetic moments on neighboring Cu sites, which in the case of Ni partially screen the inherent impurity spin, resulting in an effective S= 1 2 moment. We investigate the impurity-induced polarizability, taking into account the presence of short-range AF correlations, and calculate the 17O NMR line broadening induced by impurity doping.
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