Numerical Diagonalization of the Periodic Anderson Model –Ground State and Magnetization Process–

The one-dimensional periodic Anderson model with six sites is diagonalized numerically for various electron numbers and for various magnetizations. Detailed comparison with the perturbation theory in the half-filled case shows that both the RKKY- and the Kondo-type couplings are important to stabilize the nonmagnetic ground state, and that as the magnetization increases, the RKKY interactions dominate the behavior of the system.