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Charge and magnetic order in two-orbital double-exchange model for manganites | | G.Jackeli
; N.B.Perkins
; N.M.Plakida
; | | Date: |
25 Oct 1999 | | Journal: | Phys. Rev. B 62, 372 (2000) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | 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-field 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 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 dicussed. | | Source: | arXiv, cond-mat/9910391 | | Services: | Forum | Review | PDF | Favorites | |
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