混合配对态波函数方程的解

从群论分析角度，在C_4v点群中，讨论了高温超导混合配对态对称性问题.考虑了层间载流子库仑关联而引起的格子正交畸变，克服了以往的混合配对态分析中双相变点的困难.对s+id混合波Ginzburg-Landau方程的求解，给出了波函数的特征；而对外磁场下临界电流行为的分析，进一步揭示了“本征钉扎”的物理实质；从而对外场下高温超导体临界电流的反常行为及电阻-温度曲线展宽现象给出一种理解. 关键词：

SOLUTIONS FOR THE WAVE FUNCTIONS OF MIXED PAIRING SYMMETRY SUPERCONDUCTORS

We study the pairing symmetry in high-temperature superconductors from the point of view of group theory analysis in the framework of Ginzburg-Landau model. By considering an orthorhombic distortion from C_4v point group because of the correlation of intralayers, the two apparent transitions needed in earlier work on mixed s and d state have been removed. The structure of a single vortex is presented by solving the Ginzburg-Landau wave function equations of the mixed s±id_x²-y² state. The analysis of the magnetic field dependence of the transport behaviors including the critical current and the R-T curve expansion reveals the origin of the so-called “eigen-pinning effect” and offers a good interpretation of the experimental observations.