Magnetic and orbital order in overdoped bilayer manganites

Abstract

The magnetic and orbital orders for the bilayer manganites in the doping region $0.5<x<1.0$ have been investigated from a model that incorporates the two $e_g$ orbitals at each Mn site, the inter-orbital Coulomb interaction and lattice distortions. The usual double exchange operates via the $e_g$ orbitals. It is shown that such a model reproduces much of the phase diagram recently obtained for the bilayer systems in this range of doping. The C-type phase with ($\pi ,0,\pi$) spin order seen by Ling et al. appears as a natural consequence of the layered geometry and is stabilised by the static distortions of the system. The orbital order is shown to drive the magnetic order while the anisotropic hopping across the $e_g$ orbitals, layered nature of the underlying structure and associated static distortions largely determine the orbital arrangements.

arXiv comment8 pages, 5 figures

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Cited by in corpus (4)

• Effect of substrate-induced strain on transport and magnetic properties of epitaxial La_0.66Sr_0.33MnO_3 thin films
• Orbital Bi-Stripes in High Doped Bilayer Manganites
• Orbital ordering and magnetic structures in $\LMFO$ and $\LWFO$ double perovskites
• Charge order and phase segregation in overdoped bilayer manganites