Influence of Thermal Hysteresis on Tcmid — (about 115 K) of High-Tc Bi-System

The Tc decay is found by the thermal hysteresis below 300 K of the high Tc (Tc mid about 150 K) Bi-Pb-Sr-Ca-Cu-O. On the other hand, the thermal hysteresis below 150 K doesn’t decrease the Tc value. The life of the high Tc is 6 times of the thermal hysteresis below 200 K. Based on the results of the electrical resistivity, the Tc value change is discussed.