Abstract
We examine the electronic structure in manganites and their anomalous properties by taking into account the Hund coupling, the degeneracy of e g orbitals in Mn ions and the electron-electron interaction. The effective Hamiltonian is derived, in which charge, spin and orbital degrees of freedom are included on an equal footing. The charge dynamics prefer the uniform orbital alignment, whereas the interaction between orbitals induces the alternate orbital ordering. As a result, the competing effects among those degrees of freedom cause unique electronic structure in manganites. We discuss the anisotropic antiferromagnetic order, anomalous magnetization process and dimensional cross-over under pressure observed in a variety of manganites.
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