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. 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.
Komarek
A C
AC
II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, Köln, Germany.
Streltsov
S V
SV
Isobe
M
M
Möller
T
T
Hoelzel
M
M
Senyshyn
A
A
Trots
D
D
Fernández-Díaz
M T
MT
Hansen
T
T
Gotou
H
H
Yagi
T
T
Ueda
Y
Y
Anisimov
V I
VI
Grüninger
M
M
Khomskii
D I
DI
Braden
M
M