Mixed order parameter superconducting states for different filling and temperature

Abstract We study the gap equation for the time reversal symmetry breaking states dx2−y2+is and dx2−y2+idxy using a tight-binding model that includes orthorhombic distortion and second- nearest-neighbor hopping, γ, at different temperatures and fillings. Mixing occurs both in square lattice and in the presence of orthorhombic distortion and also for various values of γ when studied as a function of the filling. Unlike the dx2−y2+idxy case the temperature dependence of the dx2−y2+is state shows a suppression in the d wave order parameter in the presence of s wave.