Hybrid Monte Carlo scheme for interacting double-exchange systems

Many magnetic and electronic properties of diverse materials of technological interestsuch as diluted, magnetic semiconductors, manganites and hexaborides can be describedusing kinetic-exchange models in which itinerant carriers are coupled to local magneticmoments. Monte Carlo simulations of the magnetic properties of such models usually treatthe local moment spins as classical and ignore electron-electron interactions due to the needto diagonalize a fermion problem at each spin flip. We have developed the first hybrid MonteCarlo scheme that allows the inclusion of electron-electron interactions at a mean field level.We have implemented the scheme for a model which includes on-site Coulomb repulsion.The inclusion of on-site repulsion tends to enhance the tendency towards magnetic order,the extent of which depends on the coupling between itinerant carriers and local moments.