Abstract
The effects of Ni and Zn substitutions for Cu and quenching on the superconducting transition temperature Tc and magnetic properties above Tc have been investigated in RBa2Cu3Oy(R=Y, Nd, Gd, Dy and Er). In heavy rare earth compounds, the effects on magnetic properties are not remarkable and the decrease rate of Tc are almost same as that of Y compound. In Nd compound, the effects on Curie temperature θp and Tc are larger than those of heavy rare earth compounds. The numerical estimation of the susceptibility of R ions including the crystalline electric field effect was performed.
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