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Effects of the magnetic impurity Ni on the Cu-spin dynamics andsuperconductivity have been studied in La_2-x_Sr_x_Cu_1-y_Ni_y_O_4_ with x =0.13 changing y finely up to 0.10. Compared with the case of the nonmagneticimpurity Zn, it has been found from the muon-spin-relaxation measurements thata large amount of Ni is required to stabilize a magnetic order of Cu spins.However, the evolution toward the stabilization of the magnetic order withincreasing impurity concentration is qualitatively similar to each other. Thearea of the non-superconducting and slowly fluctuating or static region of Cuspins around Ni has been found to be smaller than that around Zn, suggestingthat the pinning of rather long-ranged dynamical spin correlation such as theso-called dynamical stripe by Ni is weaker than that by Zn. This may be thereason why Zn destroys the superconductivity in the hole-doped high-T_c_cuprates more markedly than Ni.Comment: 4 pages, 4 figures, accepted for publication in Phys. Rev.

physical review. b, condensed matter and materials physics

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