Recent content by thebobguy

A non-Bravais lattice can be viewed as some Bravais lattice with the basis sitting at the lattice points, and so it will have primitive vectors, as long as we realize our lattice points are now a collection of atoms. For example, think of the CuO2 planes in a cuprate superconductor. We can...

Also, we can extend both models over whatever range of lattice sites we like with differing couplings for nearest-neighbour, next-nearest-neighbour, and so on... As was already said, the Ising model is a good model for when only the z components of the spins interact. Unfortunately, there isn't...