Abstract
We have found an anomalous suppression of superconductivity at , where (the hole concentration per Cu) , in the partially Zn-substituted compound with . In these samples with and , 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- cuprates including planes in their crystal structures.
- Received 3 October 1997
DOI:https://doi.org/10.1103/PhysRevB.57.7491
©1998 American Physical Society