The energy and the total spin of the ground state of Hubbard model on 2 × 2 × 2 lattice are calculated for various values of the intra-atomic Coulomb repulsion I. The total spin S of the ground state assumes the smallest value when the electron number N is 2, 3 or 6, irrespective of the value of I. For N = 5, S is 3 2 and is independent of I, too. For N = 4 or 7, S assumes the smallest value when I is not very large, and the ground state becomes completely ferromagnetic when I exceed 39 or 200 times the inter atomic transfer energy, respectively. © 1979.
