Mean-Field Approach to Charge, Orbital, and Spin Ordering in Manganites

Details Mean-Field Approach to Charge, Orbital, and Spin Ordering in Manganites Mean-Field Approach to Charge, Orbital, and Spin Ordering in Manganites

2000-10-14

arxiv.org/abs/cond-mat/0010197v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1142/S021797920100646X

We present a mean-field theory of charge, orbital, and spin ordering in manganites at 50% and 0% dopings by considering Jahn-Teller interaction, nearest-neighbor repulsion, and no single-site double occupancy. For spinless fermions, we show that Jahn-Teller distortion and charge-orbital ordering occur simultaneously. In our two-dimensional model at 50% doping, for small nearest-neighbor repulsion the system is orbitally polarized while for larger repulsion the system undergoes CE type ordering. As for the 0% doping case, the ground state is orbitally antiferromagnetic. Upon including spin degree of freedom, at both 50% and 0% dopings the ordering remains the same at small antiferromagnetic coupling between adjacent core spins.

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