Thermoelectric power of deoxygenated Bi1.6Pb0.4Sr2Ca2Cu3O10+δ sintered superconducting pellets

The thermal variation of the electrical resistivity and thermoelectric power of Bi1.6Pb0.4Sr2Ca2Cu3O10 + delta pellets subjected to various degrees of deoxygenation is reported. The temperature dependence of the electrical resistivities of deoxygenated samples displays gradual transformation from metallic-like to semiconductor-like features in the normal state. All the samples however, show superconducting transition, but increasing deoxygenation depresses T-c0 from 102 to 45 K. Gross features of the temperature variation of thermoelectric power observed in properly oxygenated (Bi, Pb)-2223 cuprates are retained in all the deoxygenated samples. Our results on electrical resistivity and thermoelectric power in the normal state have been found to be consistent with a two-band model.