CaCrO3: an anomalous antiferromagnetic metallic oxide |
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Authors: | Komarek A C Streltsov S V Isobe M Möller T Hoelzel M Senyshyn A Trots D Fernández-Díaz M T Hansen T Gotou H Yagi T Ueda Y Anisimov V I Grüninger M Khomskii D I Braden M |
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Affiliation: | II. Physikalisches Institut, Universit?t zu K?ln, Zülpicher Strasse 77, K?ln, Germany. |
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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. Local spin density approximation calculations correctly describe the metallic behavior as well as the anisotropic magnetic ordering pattern of C type: The high Cr valence state induces via sizable pd hybridization remarkably strong next-nearest-neighbor interactions stabilizing this ordering. The subtle balance of magnetic interactions gives rise to magnetoelastic coupling, explaining pronounced structural anomalies observed at the magnetic ordering transition. |
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