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- W2017364582 abstract "The phase diagram of half-doped perovskite manganites is studied within the extended double-exchange model. To demonstrate the role of orbital degrees of freedom both one- and two-orbital models are examined. A rich phase diagram is obtained in the mean-filed theory at zero temperature as a function of J [antiferromagnetic (AFM) superexchange interaction] and V (intersite Coulomb repulsion). For the one-orbital model a charge-ordered (CO) state appears at any value of V with different types of magnetic order which changes with increasing J from ferromagnetic (F) to AFM ones of the types A, C, and G. The orbital degeneracy results in appearance of a new CE-type spin order that is favorable due to opening of the ``dimerization'' gap at the Fermi surface. In addition, the CO state appears only for $V>{V}_{c}$ for F and CE states while the C-type AFM state disappears and A-type AFM state is observed only at small values of V as a charge disordered one. The relevance of our results to the experimental data are discussed." @default.
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- W2017364582 date "2000-07-01" @default.
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- W2017364582 title "Charge- and magnetic-ordering in a two-orbital double-exchange model for manganites" @default.
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- W2017364582 doi "https://doi.org/10.1103/physrevb.62.372" @default.
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