Angular Dependence of the Critical Current Density in Two-Band Ginzburg-Landau Theory

In this study, we have calculated the angular dependence of critical current using the two-band Ginzburg-Landau (GL) theory, generalized for the anisotropic mass case in different bands. It was illustrated that the two-band GL theory gives analytical expression for the angular dependence of critical current density. In calculations, we employ results of microscopical simulations for Fermi surface of LaFeAsO_1 − xF_x compound. It is shown that such a theory is in agreement with the experimental data for this compound. The obtained result was discussed in comparison with other studies which take into account pinning effects.