Charge- and magnetic-ordering in a two-orbital double-exchange model for manganites

G. Jackeli, N. Perkins, N. Plakida

Research output: Contribution to journalArticle

46 Scopus citations

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 (Formula presented) 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.

Original languageEnglish (US)
Pages (from-to)372-378
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number1
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

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