SPIRAL MAGNETIC ORDERING AND PHASE SEPARATION IN METALLIC SYSTEMS WITH THE HYBRIDIZATION OF THE ELECTRONIC SPECTRUM
The ground state magnetic phase diagram of the Anderson lattice model is calculated within a generalized Hartree-Fock approximation with account of spiral magnetic ordering. The consistent treatment of phase transitions between different magnetic phases allows to describe the magnetic phase separation which is a general consequence of density and magnetization jump for first-order transitions. The physical picture of spiral magnetism in the cases of integer and intermediate valence appears to be substantially different. In the former case the perturbation theory in the inverse Coulomb interaction and d-level energy yields the effective s-d exchange model. The latter gives the picture of magnetic order, which is qualitative close to that obtained earlier within the Hubbard model.