1 research outputs found
High-Pressure Synthesis of 5d Cubic Perovskite BaOsO<sub>3</sub> at 17 GPa: Ferromagnetic Evolution over 3d to 5d Series
In continuation of the series of
perovskite oxides that includes
3d<sup>4</sup> cubic BaFeO<sub>3</sub> and 4d<sup>4</sup> cubic BaRuO<sub>3</sub>, 5d<sup>4</sup> cubic BaOsO<sub>3</sub> was synthesized by
a solid-state reaction at a pressure of 17 GPa, and its crystal structure
was investigated by synchrotron powder X-ray diffraction measurements.
In addition, its magnetic susceptibility, electrical resistivity,
and specific heat were measured over temperatures ranging from 2 to
400 K. The results establish a series of d<sup>4</sup> cubic perovskite
oxides, which can help in the mapping of the itinerant ferromagnetism
that is free from any complication from local lattice distortions
for transitions from the 3d orbital to the 5d orbital. Such a perovskite
series has never been synthesized at any d configuration to date.
Although cubic BaOsO<sub>3</sub> did not exhibit long-range ferromagnetic
order unlike cubic BaFeO<sub>3</sub> and BaRuO<sub>3</sub>, enhanced
feature of paramagnetism was detected with weak temperature dependence.
Orthorhombic CaOsO<sub>3</sub> and SrOsO<sub>3</sub> show similar
magnetic behaviors. CaOsO<sub>3</sub> is not as conducting as SrOsO<sub>3</sub> and BaOsO<sub>3</sub>, presumably due to impact of tilting
of octahedra on the width of the <i>t</i><sub>2g</sub> band.
These results elucidate the evolution of the magnetism of perovskite
oxides not only in the 5d system but also in group 8 of the periodic
table