Thanks for your response! Yeah, the m=tanhm one is what you get for the regular (ferromagnetic) Ising model, which is already not so simple, as you said, but I think it's even more complicated in the antiferromagnetic case. In the latter case, nearest neighbors have opposite spins at low T, and...
Hello,
I am trying to work out a mean field theory for an antiferromagnetic Ising model on a square lattice. The Hamiltonian is:
## H = + J \sum_{<i,j>} s_{i} s_{j} - B \sum_{i} s_{i} ##
## J > 0 ##
I'm running into issues trying to use
## <s_{i}> = m ##
together with the self-consistency...