Bi-Sr-Ca-Cu-O High T sub C Superconductors
12 July 1988
A recent paper by H. Maeda et al. reported the discovery of a new 120K superconductor based on a rare earth-free ceramic material in the bismuth- strontium-calcium-copper-oxide system. We have confirmed the existence of the 120K phase in the oxide system. The resistivity-temperature curve showed a fairly well-defined double dip shape with the first dip starting at ` 120K and the second at ` 95K. The transition temperature, T sub C (R=O), was 84K. This material appears to contain two superconducting phases with different T sub C 's.