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Title: Magnetic, orbital, and charge ordering in the electron-doped manganites
Authors: Maitra, Tulika
Taraphder A.
Published in: Physical Review B - Condensed Matter and Materials Physics
Abstract: The 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.
Citation: Physical Review B - Condensed Matter and Materials Physics (2003), 68(17): -
Issue Date: 2003
ISSN: 10980121
Author Scopus IDs: 7004183343
Author Affiliations: Maitra, T., Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Str. 38, Dresden, 01187, Germany
Taraphder, 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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