Effects of Y, Er and Lu substitution upon superconductivity in (Bi,Pb): 2223 system

The effect of partial substitution of Ca by x = 0.02Y, 0.02Er and 0.02Ln in the (Bi,Pb):2223 superconductor was investigated by resistivity and AC sus ceptibility measurements. The rate of depression for T-c in x = 0.02 sample s is found to be almost the same for all substituents. Residual resistivity varies according to the type of substituting ions. The linear dependence o f intergranular temperature T-p as a function of AC field amplitude agrees with Muller critical state model. (C) 2000 Elsevier Science B.V. All rights reserved.