Jahn-Teller Effect and Superexchange in Half-Doped Manganites

Details Jahn-Teller Effect and Superexchange in Half-Doped Manganites Jahn-Teller Effect and Superexchange in Half-Doped Manganites

2003-03-12

arxiv.org/abs/cond-mat/0303231v1

Phys. Stat. Sol. (b) 236, 380 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

We investigate the stability of the charge exchange (CE) phase within a microscopic model which describes a single plane as in La$_{0.5}$Sr$_{1.5}$MnO$_4$. The model includes Coulomb interactions (on-site and intersite), the Jahn-Teller term and the superexchange interactions due to $e_g$ and $t_{2g}$ electrons. By investigating the phase diagram at T=0 in mean-field approximation we conclude that the superexchange interactions can stabilize the CE phase, but only if they are stronger than estimated from spectroscopy.

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