High-pressure synthesis of an unusual antiferromagnetic metal CaCoO3 with GdFeO3-type perovskite structure.
High-pressure synthesis of an unusual antiferromagnetic metal CaCoO3 with GdFeO3-type perovskite structure.
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高压合成具有 GdFeO3 型钙钛矿结构的不寻常反铁磁金属 CaCoO3。
DOI：
10.1103/physrevb.95.224440
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. Ishiwata
中科院分区：
文献类型：
--
作者：
T. Osaka;H. Takahashi;H. Sagayama;Y. Yamasaki;S. Ishiwata
针对缺氧型钙钛矿，采用高压氧退火法成功地合成了钙钛矿结构。基于同步辐射X射线衍射仪的详细结构分析和热重分析表明，样品中Co的价态为+4，无氧缺位。该化合物在95K表现出反铁磁有序，可能具有螺旋自旋排列，并将非共格金属态保持到最低温度。这项工作表明，通过晶格扭曲来控制带宽，钙钛矿型氧化物呈现出多种磁相。
The-type perovskitehas been successfully synthesized by high-pressure oxygen annealing for the oxygen deficient perovskite. A detailed structural analysis based on synchrotron x-ray diffraction data and a thermogravimetric analysis show that the valence of Co is +4 and the sample is free from oxygen deficiency. This compound shows an antiferromagnetic ordering at 95 K, which has presumably helical spin arrangement, with keeping the incoherent metallic state down to the lowest temperature. This work demonstrates that the-perovskite oxides exhibit a variety of magnetic phases by the bandwidth control through the lattice distortion.