Abstract
We present the measured resistivity, Hall coefficient, and magnetization in three kinds of Bi2Sr2CaCu2O8+δ ceramics subjected to various heat treatments. The Hall effect shows that the carriers have the hole characteristic in this system. The hole number varies according to the heat treament. It increases and Tc decreases as a result of oxidation. In spite of the atmosphere of the heat treatment, the density of the flux pinning is increased by quenching. The Hall mobility is independent of the heat treatments for Bi2Sr2CaCu2O8+δ This result indicates that oxygens enter and leave sites on a plain other than the CuO2 plain in Bi2Sr2CaCu2O8+δ.
