CORRELATION BETWEEN THE MAGNITUDE OF THE SUPERCONDUCTING TRANSITION-TEMPERATURE AND THE NORMAL-STATE MAGNETIC-SUSCEPTIBILITY IN BI2SR2CACU2O8+Y AND TL2BA2CUO6+Y AS A FUNCTION OF OXYGEN-CONTENT

The static magnetic susceptibility of Bi2Sr2CaCu2O8+y and Tl2Ba2CuO6+y is studied as a function of oxygen content y over the temperature range 2-900 K. With increasing oxygen (hole) content the superconducting transition temperature Tc(y) passes through a maximum for the Bi-compound and falls monotonically for the Tl-system, reaching a maximal value of c≅92 K in both systems. As the oxygen content is varied, a correlation is observed between the magnitude of Tc(y) and the temperature dependence of the normal-state magnetic susceptibility. The fact that this same correlation can also be seen in the published data on La2-xSrxCuO4 and YBa2Cu2O6+y implies that it may be a universal property of hole-doped oxide superconductors. © 1990.