单相超导体CaLaBaCu_(3-x)BxO_(7-δ)正常态热电势率研究

Thermoelectric power and resistivity of B substituted CaLaBaCu_(3-x)BxO_(7-δ)(1113) at normal state

从 77K到 30 0 K之间对 Ca L a Ba Cu3 -x Bx O7-δ单相体系的正常态热电势率进行了微分法测量 ,发现随着硼含量 x从 0向 0 .4的逐步增加 ,样品体系正常态特性从金属性向类半导体性质转变 ,其主要载流子由空穴型为主转变为电子型为主 .根据以上的性质转变 ,我们采用双带模型及半导体模型对 x的不同值进行曲线模拟 ,拟合的热电势率—温度曲线与实验曲线相当吻合 。

Measurements of the thermoelectric power(TEP) were carried out on CaLaBaCu\-\{3\|\%x\%\}B\-\%x\%O\-\{7\|\%δ\%\}(0≤\%x\%<0.4) specimens between 77K and 300K.The character of specimens changes from metal\|like to semiconductor\|like at normal state and the major carrier turnes from holel\|type to electron\|type with the increasing of \%x\% (0≤\%x\%<0.4). Based on transition above, the experiment dates were dealt with two\|band model and semiconducting model to different value of \%x\%. The experiment curves coincide with the calculated curves well. At the same time, the E\-f and the ΔE\-e were calculated. \$