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摘要: 测量了一系列在不同淬火温度下制得的单相YBa2Cu3O7-x样品的电阻和热电势率。热电势率与温度的关系表明,在正交结构的超导体中,存在声子曳引峰,而在四方结构的样品中,声子曳引峰消失,说明电-声子相互作用对超导电性有影响。根据热电势率数据,估算了样品的费密能和载流子浓度。
Abstract: The resistance and thermoelectric power were measured for a series of single phase YBa2 Cu3O7-x samples with different quenching temperature. The relation between the thermopower and temperature indicates that there exists a phonon-drag peak in orthorhombic phase sample. The peak disappears in tetragonal phase sample. This phenomeron suggests that the electron-phonon interaction influences the superconduc tivity of YBa2 Cu3O7-x. According to the experimental data of thermoelectric power, estimation for the Fermi energy and carrier concentration of the sample are made.