Anomalous suppression of superconductivity in Zn-substituted Bi2Sr2Ca1-xYx(Cu1-yZny)2O8+δ

We have found an anomalous suppression of superconductivity at x = 0.30-0.35, 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 = 0.02-0.03, transport properties such as electrical resistivity and thermoelectric power exhibit less metallic behavior than usual. There is a possibility that a kind of order of holes and/or spins is stabilized owing to pinning by Zn, as in the La-based cuprate. It is likely that the 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 planes in their crystal structures.