Evidence for nonexistence of superconductivity in an isolated CuO2 bilayer- art. no. 092507

We report the magnetization measurements for the organic-chain [Py-CnH2n+1] (2)HgI4 (n = 2, 4, 6, 8, 10, and 12) intercalated Bi2Sr2CaCu2O8 for which t he intercalation accompanies no charge transfer between the host and the gu est materials. We observed a complete disappearance of superconductivity in Bi2Sr2CaCu2O8 due to drastically increased distance for the next-nearest-n eighbor CuO2 plane, even though the distance for the nearest-neighbor plane is unchanged. This result leads us to the conclusion that the three-dimens ional linkage of CuO2 planes via the interlayer coupling is essential to hi gh-temperature superconductivity. In other words, the isolated CuO2 bilayer does not give a finite T-c.