Geometry of the order-disorder surface of the mean-field square lattice Ising model with up to third-neighbor interactions

Rodolfo Subert, Bela M. Mulder

We revisit the field-free Ising model on a square lattice with up to third-neighbour (nnnn) interactions, also known as the $J_1$--$J_2$--$J_3$ model, in the mean-field appro…