Jahn-Teller Effect and Superexchange in Half-Doped Manganites

Abstract

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.

4 pages, 3 figures

References in corpus (3)

• On charge and orbital ordering in La0.5Sr1.5MnO4
• Spin, charge and orbital ordering in La0.5Sr1.5MnO4
• Ferromagnetic zigzag chains and properties of the charge ordered perovskite manganites