Ferromagnetic, A-type, and Charge-Ordered CE-type States in Doped Manganites using Jahn-Teller Phonons

Abstract

The two-orbital model for manganites with both non-cooperative and cooperative Jahn-Teller phonons is studied at hole density x=0.5 using Monte Carlo techniques. The phase diagram is obtained varying the electron-phonon coupling and the ${\mathrm{t}}_{2g}$-spins exchange. The insulating CE-type charge- and orbital-ordered state with the $z$-axis charge $stacking$ observed in narrow-bandwidth manganites is stabilized in the simulations. Its charge gap ${\Delta }_{\mathrm{CO}}$ is much larger than the critical temperature ${\mathrm{k}}_{\mathrm{B}}{\mathrm{T}}_{\mathrm{CO}}$. Metallic-like A-type and ferromagnetic states are also obtained in the same framework, and the phase boundaries among them have first-order characteristics.

4 pages, Revtex, with 4 figures embedded

References in corpus (1)

• Topological Scenario for Stripe Formation in Manganese Oxides

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