  We propose the origin of the charge-ordered stripe structure with the orbital
ordering observed experimentally in La_(1-x)Ca_(x)MnO_(3) (x=1/2, 2/3), in
which the long-range Coulomb interaction plays an essential role. We study a
Hubbard model with doubly-degenerate e_g orbitals, and treat the on-site
Coulomb interaction (U) and the nearest-neighbor one (V) with the Hartree-Fock
approximation. Both the charge and orbital ordering structures observed in
experiments are reproduced in a wide region of the U-V phase diagram determined
by the present study. The stability of the orbital ordering is also confirmed
by the perturbation theory.
