1999/12/29 by Takashi Hotta, Elbio Dagotto
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.61.r11879
4 pages, Revtex, with 2 figures embedded in the text. Submitted to Phys. Rev. B
arxiv created 1999/12/29 · openalex publication_date 2000/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Spin, charge, and orbital structures in models for doped manganites are studied by a combination of analytic mean-field and numerical relaxation techniques. At realistic values for the electron-phonon and antiferromagnetic t2g spin couplings, a competition between a ferromagnetic (FM) phase and a charge-orbital ordered (COO) insulating state is found for x=1/4, 3/8, and 1/2, as experimentally observed in Pr_1\ensuremath-xCaxMnO3 for x=0.3--0.5. The theoretical predictions for the spin-charge-orbital ordering pattern are compared with experiments. The FM-COO energy difference is surprisingly small for the densities studied, and the results compatible with the presence of a robust colossal-magnetoresistive effect in Pr_1\ensuremath-xCaxMnO3 in a large density interval.