Origin of the Charge-Orbital Stripe Structure in La(1-x)Ca(x)MnO(3) (x=1/2, 2/3)
Tetsuya Mutou, Hiroshi Kontani
Abstract
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 eg 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.
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