1999/04/30 by Tetsuya Mutou, Hiroshi Kontani · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.83.3685
4 pages, 5 Postscript figures, REVTeX, submitted to Phys. Rev. Lett
arxiv created 1999/04/30 · openalex publication_date 1999/11/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We propose the origin of the charge-ordered stripe structure with the orbital ordering observed experimentally in La_1\ensuremath-xCaxMnO3 ( x\phantom\rule0ex0ex=\phantom\rule0ex0ex1/2,2/3), in which the long-range Coulomb interaction plays an essential role. We study a Hubbard model with doubly degenerate eg orbitals, and treat the on-site Coulomb interaction ( U) and the nearest-neighbor interaction ( V) with the Hartree-Fock approximation. Both the charge and orbital ordering structures observed in experiments are reproduced for a wide region of the U\ensuremath-V phase diagram. The stability of the orbital ordering is also confirmed by perturbation theory.