Relationship between orbital structure and lattice distortions: CE phase of manganites, revisited

Abstract

Analyzing the orbital structure and lattice distortions in the CE phase of half-doped manganites, we demonstrate that the usual approach directly relating the orbital occupation of Jahn-Teller ions to the displacements of neighboring ligands may be misleading. For the correct identification of orbital structure, it is necessary to take self-consistently into account the electron-lattice interactions, kinetic energy of charge carriers, and crystal-field effects. In certain situations, e.g. in the CE phase of single-layered manganite La${}_{0.5}$Sr${}_{1.5}$MnO${}_4$, the type of orbital ordering strongly deviates from that, which one would deduce from the local lattice distortions.

9 pages, 10 figures, RevTeX

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• Orbital order in La0.5Sr1.5MnO4: beyond a common local Jahn-Teller picture
• THz Field Control of In-Plane Orbital Order in La0.5Sr1.5MnO4
• Electronic structure of V${}_4$O${}_7$: charge ordering, metal-insulator transition and magnetism
• Charge order induced in an orbital density-wave state
• Orbital ordering transition in the single-layer manganites near half doping: a weak-coupling approach