Abstract: A theoretical research of thermoelectric power of Bi_2-xPb_xSr₂CaCu₂O_8+δ is done with the local pair thermoelectric power theory, and the results are consistent with the experiment. It is argued that the high-T_C superconductor, which is considered as a two-component system (nearly local negative U center subsystem and itinerant carriers subsystem), goes through a delocalized process when temperature decreases. Below a certain temperature, it tends to become superconducting.

Key words: thermoelectric power(TEP), negative U center model, normal state property of high-T_C superconductive oxides, local pair model of thermoletric power

摘要： 以局域对温差电势率的理论分析Bi_2-xPb_xSr₂CaCu₂O_8+δ正常态的温差电势率。结果表明此理论与实验一致。指出高温超导系统作为双成分系统(近局域化的负U中心子系统和巡游载流子子系统)，随温度下降出现了退局域化过程，形成产生超导的较佳条件。

关键词: 温差电势率, 负U中心理论, 高温超导氧化物正常态性质, 局域对温差电势率理论