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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13668
Title: Double exchange and orbital correlations in electron-doped manganites
Authors: Maitra, Tulika
Taraphder A.
Published in: Europhysics Letters
Abstract: A double-exchange model for degenerate eg orbitals with intra- and inter-orbital interactions has been studied for the electron-doped manganites A1-xBxMnO3 (x > 0.5). We show that such a model reproduces the observed phase diagram and orbital ordering in the intermediate-bandwidth regime and the Jahn-Teller effect, considered to be crucial for the region x < 0.5, does not play a major role in this region. Brink and Khomskii have already pointed this out and stressed the relevance of the anistropic hopping across the degenerate eg orbitals in the infinite Hund's coupling limit. From a more realistic calculation with finite Hund's coupling, we show that inclusion of interactions stabilizes the C-phase, the antiferromagnetic metallic A-phase moves closer to x = 0.5 while the ferromagnetic phase shrinks. This is in agreement with the recent observations of Kajimoto et al. and Akimoto et al.
Citation: Europhysics Letters (2002), 59(6): 896-902
URI: https://doi.org/10.1209/epl/i2002-00127-x
http://repository.iitr.ac.in/handle/123456789/13668
Issue Date: 2002
ISSN: 2955075
Author Scopus IDs: 7004183343
6602698909
Author Affiliations: Maitra, T., Department of Physics and Meteorology, Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India
Taraphder, A., Department of Physics and Meteorology, Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India, Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48823-1116, United States
Corresponding Author: Maitra, T.; Dept. of Physics and Meteorology, Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India; email: tulika@phy.iitkgp.ernet.in
Appears in Collections:Journal Publications [PH]

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