Abstract

The two-orbital double-exchange model with effects of lattice distortion and Coulomb repulsion is studied for quarter-filled perovskite manganites using a mean field approximation. A phase diagram of the ground state (GS) of two-dimensional systems is depicted in terms of the lattice distortion and t2g spins exchange. The calculated results show that the ferromagnetic state with x2−y2 orbital ordering is stabilized at finite lattice distortion. The GS becomes CE phase with increasing superexchange coupling between t2g localized spins.

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