A tricritical point of the superconducting phase transformation in the anisotropic charged layered lattice XY model I

Abstract

We proposed the anisotropic charged layered XY lattice model for phase transition in high T_c superconducting oxide. It is capable of describing from Kosterlitz-Thouless transition in two dimension to standard second-order phase transition in three dimension. This model is investigated using the mean field plus two loop effective energy approach. We find the tricritical point above T_c that is suggest the possibility of first order phase transition.