摘要
Superconductivities in the 90K range as measured by resistance and magnetic susceptibility are reported for RBa_(2)Cu_(3)O_(9-y)(R=Y,Nd,Sm,Eu,Gd,Dy,Er,Tm,Yb)having the orthorhornbic perovskite structure.Unstable resistance drop above 100K has been found in ErBCO,probably associated with interfacial superconductivity.
