I want to calculate Curie temperature from exchange parameters (J1&J2). How will I calculate it classically once obtained J1 & J2 without MC simulations. I am using VASP.
The Curie temperature can be calculated from the exchange constants with various mean-field theory methods, but I should mention that they are not usually very accurate. Here's a recent paper which claims to improve the accuracy, I haven't read it though. Preprint Theoretical prediction of Curie temperature in two-dimension...