Effects of Ni-to-Cu substitution on the properties of the high-Tc superconductor La1.85Sr10.15CuO4-y
Résumé
We report experimental data about the influence of Ni substitution on the properties of the high-Tc superconductor La1.85Sr10.15CuO4-y, 0≤ x ≤0.05. Superconductivity is totally suppressed above x=0.04 and the Curie law observed at x=0.05 reveals an effective magnetic moment of 0.7μB instead of 3 μB as for spin (1/2. This result is explained by the existence of a singly &) level. Possibilities for non-s-wave superconductivity are also discussed in conjunction with our experimental data.
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