Abstract
A review is given of the impurity effect on the static spin correlations in lightly doped La 2 - x Sr x CuO 4 studied by the neutron scattering technique. Zn doping reduces the incommensurability just slightly. On the other hand, Ni doping quickly reduces the incommensurability and restores Néel ordering, indicating a strong effect on hole localization. This suggests that Ni is doped as Ni 3 + or that doped Ni 2 + and hole form a strongly bound state with the Zhang–Rice character. It was found that this behavior is universal in a wide range of hole concentration in La 2 - x Sr x CuO 4 ( 0.01 ⩽ x ⩽ 0.07 ).
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