Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-12-29
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, Revtex, with 2 figures embedded in the text. Submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.61.R11879
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 $t_{2g}$ 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$_{1-x}$Ca$_{x}$MnO$_3$ for $x$=0.3$\sim$0.5. The theoretical predictions for the spin-charge-orbital ordering pattern are compared with experiments. The FM-COO energy difference is surprisingly small for the densities studied, result compatible with the presence of a robust colossal-magnetoresistive effect in Pr$_{1-x}$Ca$_{x}$MnO$_3$ in a large density interval.
Dagotto Elbio
Hotta Takashi
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