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 beca use 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 e quations of the mixed s +/- id(x2-y2) state. The analysis of the magnetic f ield dependence of the transport behaviors including the critical current a nd the R-T curve expansion reveals the origin of the so-called "eigen-pinni ng effect" and offers a good interpretation of the experimental observation s.