Are the couplings all antiferromagnetic? If so there is no way around the sign problem. 




On Dec 5, 2012, at 4:14, sh po <quin_girl_sh@yahoo.com> wrote:

Dear  friends.
 I would appreciate if you could help me with using classic montecarlo simulation for fcc lattice on Heisenberg hamiltonian
 with s=1 and H=SIGMA Jij Si.Sj
and Jij is just sum over  nearest neibours.Would you mind telling me step by step that what should I do and exactly which codes I must use for this purpose?Its the first time I wanna use Alps and I dont know the steps of working with it.
 
Many thanks for your helps.
I would appreciate your immediate attention to this matter.