Prediction of the existence of an intermediate phase in the antiferromagnetic J₁-J₂system on the face-centered cubic lattice

The structure o f the phase diagram of the antiferromagnetic Ising model with the presence of the nearest-neighbor and next-nearest-neighbor interactions on the face-centered cubic lattice is investigated in detail in the framework of the recursive lattice approximation. The existence of an additional well-defined intermediate phase is predicted that separates two standard antiferromagnetic phases of the model....