Double exchange and orbital correlations in electron-doped manganites

Details Double exchange and orbital correlations in electron-doped manganites Double exchange and orbital correlations in electron-doped manganites

2002-09-04

arxiv.org/abs/cond-mat/0209089v1

Europhysics Letters, Vol - 59, 15 September (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

text 9 pages, 5 figures

Scientific paper

10.1209/epl/i2002-00127-x

A double exchange model for degenerate $e_g$ orbitals with intra- and inter-orbital interactions has been studied for the electron doped manganites A$_{1-x}$B$_{x}$MnO$_3$ ($x > 0.5$). 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 $e_g$ 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.

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