T sub c -Suppression and Hole Concentration in Copper Substituted YBa sub 2 (Cu sub 1--x M sub x ) sub 3 O sub 7-- delta With Fe, Co, Ni, Zn

From the studies of the Cu substituted YBa sub 2 (Cu sub 1--x M sub x ) sub 3 O sub 7--y (M = Fe, cobalt, Ni, Zn) systems, it is concluded that the pair-breaking of the Abrikosov and Gor'kov type by magnetic impurities is absent, or very small if it exists, both on the C(1) and C(2) sites. The Hall coefficient is measured for the systems. There is a certain relation between T sub c and n sub H in the substituted materials with Fe and Co, while no relation is deduced from the Ni- and Zn-substituted ones. Graphs. 10 ref.--AA