An effective Hamiltonian for an extended Kondo lattice model and a possible origin of charge ordering in half-doped manganites

Details An effective Hamiltonian for an extended Kondo lattice model and a possible origin of charge ordering in half-doped manganites An effective Hamiltonian for an extended Kondo lattice model and a possible origin of charge ordering in half-doped manganites

1999-04-29

arxiv.org/abs/cond-mat/9904420v1

Phys. Rev. B 59, 14484 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages ReTex with two figures To appear in Phys. Rev. B 59, (June 1, 1999)

Scientific paper

10.1103/PhysRevB.59.14484

An effective Hamiltonian is derived in the case of the strong Hund coupling and on-site Coulomb interaction by means of a projective perturbation approach. A physical mechanism for charge ordering in half-doped manganites (R_{0.5}X_{0.5}MnO_3) is proposed. The virtual process of electron hopping results in antiferromagnetic superexchange and a repulsive interaction, which may drive electrons to form a Wigner lattice. The phase diagram of the ground state of the model is presented at half doping. In the case of formation of Wigner lattice, we prove that spins of electrons are aligned ferromagnetically as well as that the localized spin background is antiferromagnetic. The influence of the on-site Coulomb interaction is also discussed.

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