Jahn-Teller distortion induced charge-ordering in CE phase of manganites

Details Jahn-Teller distortion induced charge-ordering in CE phase of manganites Jahn-Teller distortion induced charge-ordering in CE phase of manganites

2005-08-29

arxiv.org/abs/cond-mat/0508673v1

Phys. Rev. B 73, 104404 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 4 figures(contained in the pdf file). submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.73.104404

The charge order of CE phase in half-doped manganites is studied, based on an argument that the charge-ordering is caused by the Jahn-Teller distortions of MnO6 octahedra rather than Coulomb repulsion between electrons. The uantitative calculation on the ferromagnetic zigzag chain as the basic structure unit of CE phase within the framework of two-orbital double exchange model including Jahn-Teller effect is performed, and it is shown that the charge-disproportionation of Mn cations in the charge-ordered CE phase is less than 13%. In addition, we predict the negative charge-disproportionation once the Jahn-Teller effect is weak enough.

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