Domain Wall and Periodic Solutions of Coupled phi6 and Coupled phi6-phi4 Models

We obtain several higher order periodic solutions of a Coupled phi6 model in terms of Lame polynomials of order one and two. These solutions are unusual in the sense that while they are the solutions of the coupled problem, they are not the solutions of the uncoupled problem. We also obtain exact solutions of coupled phi6-phi4 models, both when the phi4 potential corresponds to a first order (asymmetric double well) or a second order (symmetric double well) transition.