Abstract
In order to investigate Ni-impurity effects on the Cu-spin dynamics in a wide range of hole concentration, we have performed zero-field muon-spin-relaxation measurements in La 2-x Sr x Cu 1-y Ni y O 4 (LSCNO) with x = 0.08-0.30 and y = 0-0.10. It has been found that the hole-trapping effect of Ni clearly appears in heavily Ni-substituted LSCNO with y≥0.05, while the stripe-pinning effect of Ni is marked in lightly Ni-substituted LSCNO around x = 1 /8 .
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