Abstract
The high temperature behavior of BiSrCaCu2 Oy was investigated by electrical resistivity measurement in relation to superconducting properties. A hysteresis was found between on heating and cooling processes in the temperature dependence of the electrical resistivity. The hysteresis occurred at about 550-700°C for the samples with high content of low Tc phase (80 K), while the hysteresis occurred at higher temperature(700-800 °C) for the samples with higher content of high Tc phase(105 K). These results suggest that the hysteresis in the temperature dependence of electrical resistivity may be related to the difference in the concentration ratio of high Tc phase to low Tc phase. Further detailed research is in progress.
