CaCrO3: an anomalous antiferromagnetic metallic oxide

Abstract

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.

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• Magnetoelastic coupling in RETiO3 (RE = La, Nd, Sm, Gd, Y)
• Subband filling and Mott transition in Ca_{2-x}Sr_xRuO_4
• Mott-Hubbard versus charge-transfer behavior in LaSrMnO4 studied via optical conductivity

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