Abstract
The incorporation of magnetic ions into superconducting materials has historically been an important tool for studying both superconductivity and magnetism. In the oxide superconductors we encounter, for the first time, a situation where the superconducting interactions are much stronger than the magnetic interactions, and this can be expected to lead to unusual and unex pected phenomena. In this paper, the currently available information concerning magnetic effects in the superconducting materials La1.85Sr0.15CuO4 (Tc~40 K) and YBa2Cu3O7-β (Tc~90 K) is reviewed. Substitution of strongly mahnetic rare-earth ions for Y or La gives no effect on Tc related to magnetic pair-breaking, although effects exist which seem to be due to electronic and/or structural phenomena. Substitution of transition metal ions for Cu results in magnetic pair-breaking, although the results are again complicated by other effects. In addition, antiferromagnetic ordering is seen on the Cu sublattice in compounds where the stoichiometry has been altered to make the materials non-superconducting.
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