CaCrO3: an anomalous antiferromagnetic metallic oxide
  Combining infrared reflectivity, transport, susceptibility and several diffraction techniques, we find compelling evidence that CaCrO3 is a rare case of a metallic and antiferromagnetic transition-metal oxide with a three-dimensional electronic structure. LSDA calculations correctly describe the metallic behavior as well as the anisotropic magnetic ordering pattern of C type: The high Cr valence state induces via sizeable pd hybridization remarkably strong next-nearest neighbor interactions stabilizing this ordering. The subtle balance of magnetic interactions gives rise to magneto-elastic coupling, explaining pronounced structural anomalies observed at the magnetic ordering transition. 
A. C. Komarek, S.V. Streltsov, M. Isobe, T. Moeller, M. Hoelzel, A.   Senyshyn, D. Trots, M.T. Fernandez-Diaz, T. Hansen, H....