Landau Theory of the Finite Temperature Mott Transition
  In the context of the dynamical mean-field theory of the Hubbard model, we identify microscopically an order parameter for the finite temperature Mott endpoint. We derive a Landau functional of the order parameter. We then use the order parameter theory to elucidate the singular behavior of various physical quantities which are experimentally accessible. 
G. Kotliar, E. Lange and M.J. Rozenberg