Rare earth ion size effect on Tc and ϱn in the Ga and Zn doped RBa2Cu3−xGaxO7−y and RBa2Cu3−xZnxO7−y systems (R=Yb,Er,Y,Dy,Gd,Eu,Sm, and Nd)

Yunhui Xu, Weiyan Guan, S.S. Ata‐Allah, Ch. Heiden