Abstract:
The phase diagram of half-doped manganite systems of formula A 0.5 A ′ 0.5MnO3 is investigated within a single-orbital model incorporating magnetic double-exchange and superexchange, together with intersite Coulomb and electron-lattice interactions. Strong Jahn-Teller and breathing mode deformations compete together and result in shear lattice deformations. The latter stabilize the charge-ordered CE-type phase, which undergo first-order transitions with temperature or magnetic field to either Ferromagnetic metallic or Paramagnetic insulating phases. An essential feature is the self-consistent screening of Coulomb and electron-phonon interactions in the ferromagnetic phase.
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Received 28 November 2000
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Fratini, S., Feinberg, D. & Grilli, M. Jahn-Teller, charge and magnetic ordering in half-doped manganese oxides. Eur. Phys. J. B 22, 157–165 (2001). https://doi.org/10.1007/s100510170123
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DOI: https://doi.org/10.1007/s100510170123