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Download fileHigh-Pressure Synthesis of 5d Cubic Perovskite BaOsO3 at 17 GPa: Ferromagnetic Evolution over 3d to 5d Series
journal contribution
posted on 2013-11-06, 00:00 authored by Youguo Shi, Yanfeng Guo, Yuichi Shirako, Wei Yi, Xia Wang, Alexei
A. Belik, Yoshitaka Matsushita, Hai Luke Feng, Yoshihiro Tsujimoto, Masao Arai, Nanlin Wang, Masaki Akaogi, Kazunari YamauraIn continuation of the series of
perovskite oxides that includes
3d4 cubic BaFeO3 and 4d4 cubic BaRuO3, 5d4 cubic BaOsO3 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 d4 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 BaOsO3 did not exhibit long-range ferromagnetic
order unlike cubic BaFeO3 and BaRuO3, enhanced
feature of paramagnetism was detected with weak temperature dependence.
Orthorhombic CaOsO3 and SrOsO3 show similar
magnetic behaviors. CaOsO3 is not as conducting as SrOsO3 and BaOsO3, presumably due to impact of tilting
of octahedra on the width of the t2g 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.