Abstract
In order to investigate the effect of magnetic impurities systematically, the superconducting phase diagram is investigated by using a concentration-graded single crystal of La 2− x Sr x Cu 0.97Ni 0.03O 4 with x between 0.10 and 0.20. The anomalous suppression of T c seen in the impurity-free system at around x=0.12, disappears upon 3% Ni-substitution and the bulk superconductivity is drastically depressed as well as T c below x∼0.12. In contrast to non-magnetic Zn-substitution no static spin correlation is observable in the 2% Ni-substituted La 1.85Sr 0.15Cu 0.98Ni 0.02O 4 ( T c=28 K). On the other hand, well-defined incommensurate magnetic peaks appear down to ω=0.4 meV. The correlation length evaluated from the inelastic peak-width is ∼50 Å, which is comparable to that of 1.2% Zn-substituted La 1.86Sr 0.14Cu 0.988 Zn 0.012O 4 (∼70 Å).
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