Kondo screening coexisting with ferromagnetic order as a possible ground state for Kondo lattice systems

摘要

We consider the competition between the Kondo screening effect and ferromagnetic long-range order (FLRO) within a mean-field theory of the Kondo lattice model for low conduction electron densities n_c. Depending on the parameter values, several types of FLRO ground states are found. When n_c <0.16, a polarized FLRO phase is dominant in the large Kondo coupling limit. For 0.16