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Substitution of isovalent non-magnetic defects, such as Zn, in CuO2 planestrongly modifies the magnetic properties of strongly electron correlated holedoped cuprate superconductors. The reason for enhanced uniform magneticsusceptibility, \c{hi}, in Zn substituted cuprates is debatable. So far, theobserved magnetic behavior has been analyzed mainly in terms of two somewhatcontrasting scenarios, (a) that due to independent localized moments appearingin the vicinity of Zn arising because of the strong electronic/magneticcorrelations present in the host compound and (b) that due to transfer ofquasiparticle spectral weight and creation of weakly localized low energyelectronic states associated with each Zn atom in place of an in-plane Cu. Ifthe second scenario is correct, one should expect a direct correspondencebetween Zn induced suppression of superconducting transition temperature, Tc,and the extent of the enhanced magnetic susceptibility at low temperature. Inthis case, the low-T enhancement of \c{hi} would be due to weakly localizedquasiparticle states at low energy and these electronic states will beprecluded from taking part in Cooper pairing. We explore this secondpossibility by analyzing the \c{hi}(T) data for La2-xSrxCu1-yZnyO4 withdifferent hole contents, p (= x), and Zn concentrations (y) in this paper.Results of our analysis support this scenario.

Zn-induced in-gap electronic states in La214 probed by uniform magnetic susceptibility: relevance to the suppression of superconducting Tc