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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 La2-xSrxCu1-yNiyO4 (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...
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