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Title: Charge order and phase segregation in overdoped bilayer manganites
Authors: Maitra, Tulika
Taraphder A.
Beck H.
Published in: Journal of Physics Condensed Matter
Abstract: There have been recent reports of charge ordering around x = 0.5 in the bilayer manganites like La2-2xSr 1+2xMn2O7. At x = 0.5, there appears to be a coexistence region of layered A-type antiferromagnetic order and charge order. There are also reports of orbital order in this region without any Jahn-Teller effect. Based on physical grounds, this region is investigated from a model that incorporates the two eg orbitals at each Mn site and a near-neighbour Coulomb repulsion. It is shown that there indeed both charge and orbital order close to the half-doped region coincident with a layered magnetic structure. Although the orbital order is known to drive the magnetic order, the layered magnetic structure is also favoured in this system by the lack of coherent transport across the planes and the reduced dimensionality of the lattice. The anisotropic hopping across the eg orbitals and the underlying layered structure largely determine the orbital arrangements in this region, while the charge order is primarily due to the long-range interactions. © IOP Publishing Ltd.
Citation: Journal of Physics Condensed Matter (2005), 17(27): 4333-4341
Issue Date: 2005
ISSN: 9538984
Author Scopus IDs: 7004183343
Author Affiliations: Maitra, T., Institut für Theoretische Physik, J W Goethe Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
Taraphder, A., Department of Physics and Meteorology, Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India
Beck, H., Institute of Physics, University of Neuchatel, rue de Breguet 1, CH-2000, Switzerland
Corresponding Author: Maitra, T.; Institut für Theoretische Physik, J W Goethe Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany; email:
Appears in Collections:Journal Publications [PH]

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