La_(2-x)Sr_xCuO_4等大温区线性电阻率与带间空穴-声子散射

Linear Resistivity of La_(2-x)Sr_xCuO_4 in Large Range of Temperature and Interband Holon-Phonon Scattering

为了研究La_(2-x)Sr_xCuO_4等大温区铜氧面线性电阻率-温度线性依赖提出了带间电-声散射概念.利用极性晶体中慢电子的运动规律推导了高温超导材料费米面上电子-声子相互作用的状态方程,再利用索末菲电阻率公式计算出线性电阻率随温度上升的比例系数为0.4(μΩ·cm)·K-1,与实验测得的结果(0.4~0.5)(μΩ·cm)·K-1基本一致.高温超导材料的线性电阻率、电子自由程不随温度变化的原因用带间电-声散射概念来解释是比较合理的.高温超导材料的其他奇特性质:宽的中红外吸收峰、延伸到约1eV的拉曼光谱背景散射等也与高能带和低能带间的能量差有关.

A new concept of interband electron phonon scattering was presented to interpret the linear resistivity in the Cu-O planes of La3-xSrxCuO4. The state equations of electron-phonon interaction at the Fermi surface were deduced from the motion of slow electrons in a polar crystal, and the ratio of 0. 4（μΩ·cm）·K^-1 of the linear resistivity with temperature rise was computed by using Sommarfold＇s electron gas model. The result and the experimentally determined parameter （0. 4 -0.5）（μΩ·cm）·K^-1 were accordant. The linear resistivity of high temperature superconducting materials, and the cause of electron free distance immovability with temperature can be explained by the concept of interband electron phonon scattering. The other abnormal properties of high oxide superconductors, for instance, middle infrared absorption peak in a wide range of hole concentration and Raman scattering background stretching about 1 eV, can be explained by interband energy differences.