ANOMALOUS SUPPRESSION OF SUPERCONDUCTIVITY IN ZN-SUBSTITUTED BI2SR2CA1-XYX(CU1-YZNY)(2)O8+DELTA

We have found an anomalous suppression of superconductivity at x = 0.3 0-0.35, where p (the hole concentration per Cu) similar to 1/8, in the partially Zn-substituted compound Bi2Sr2Ca1-xYx(Cu1-yZny)(2)O8+delta with y = 0.02-0.03. In these samples with p similar to 1/8 and y = 0.0 2-0.03, transport properties such as electrical resistivity and thermo electric power exhibit less metallic behavior than usual. There is a p ossibility that a kind of order of holes and/or spins is stabilized ow ing to pinning by Zn, as in the La-based cuprate. It is likely that th e so-called ''1/8 problem'' is not only characteristic of the La-based cuprate but also common to all high-T-c cuprates including CuO2 plane s in their crystal structures.