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dc.contributor.authorMaitra, Tulika-
dc.contributor.authorTaraphder A.-
dc.identifier.citationPhysical Review B - Condensed Matter and Materials Physics (2003), 68(17): --
dc.description.abstractThe three-dimensional perovskite manganites R1−xAxMnO3 in the range of hole doping x>0.5 are studied in detail using a double-exchange model with degenerate eg orbitals including intraorbital and interorbital correlations and near-neighbor Coulomb repulsion. We show that such a model captures the observed phase diagram and orbital ordering in the intermediate- to large-bandwidth regimes. It is argued that the Jahn-Teller effect, considered to be crucial for the region x<0.5, does not play a major role in this region, particularly for systems with moderate to large bandwidths. The anisotropic hopping across the degenerate eg orbitals is essential for the understanding of the ground-state phases of this region, an observation emphasized earlier by Brink and Khomskii. Based on calculations using a realistic limit of finite Hund’s coupling, we show that the inclusion of interactions stabilizes the C phase, and the antiferromagnetic metallic A-phase moves closer to x=0.5 while the ferromagnetic phase shrinks, in agreement with recent observations. The charge ordering close to x=0.5 and the effect of reduction of bandwidth are also outlined. The effect of disorder and the possibility of inhomogeneous mixture of competing states are discussed. © 2003 The American Physical Society.-
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physics-
dc.titleMagnetic, orbital, and charge ordering in the electron-doped manganites-
dc.affiliationMaitra, T., Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Str. 38, Dresden, 01187, Germany-
dc.affiliationTaraphder, A., Department of Physics and Meteorology and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur, 721302, India-
Appears in Collections:Journal Publications [PH]

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