We analyzed the possible magnetic and orbital orderings of double perovskites, using a simple extension of the double exchange model well suited for these compounds. Orbital ordering is favored by the on site repulsion at the Fe ions. We obtain a rich phase diagram, including ferri- and antiferromagnetic phases, which can, in turn, be metallic or insulating, depending on the existence of orbital order.
@article{arxiv.cond-mat/0406605,
title = {Orbital ordering and magnetic structures in $\LMFO$ and $\LWFO$ double perovskites},
author = {A. Taraphder and F. Guinea},
journal= {arXiv preprint arXiv:cond-mat/0406605},
year = {2009}
}