First-principles calculations of magnetic transition temperatures

We introduce a method to evaluate magnetic transition temperatures of strongly correlated systems. It is based on a combination of dynamical mean field theory, the local density functional theory, and employs ``magnetic force theorem'' for evaluating exchange constants. The method automatically predicts at a given temperature whether the system is ordered or disordered magnetically. We illustrate the approach on several systems, and discuss its accuracy in comparison with the experiment. The effect of electron-electron correlations on these predictions will be discussed.