A new mean field theory for Ising spin-fermion model: application to diluted magnetic semiconductors

We have investigated the ferromagnetic transition of an Ising spins-fermions model, where Ising spins are located randomly and tight-binding fermions interact with the Ising spins via the exchange interaction. We extended the inhomogeneous mean field theory to include the local dynamics of localized spins and applied to this model. We have found that the ferromagnetic moment is not saturated because of localization of fermions due to the randomness