High-pressure synthesis of an unusual antiferromagnetic metal CaCoO3 with GdFeO3-type perovskite structure

被引：23

作者：

Osaka, T. ^{[1
,2
]}

Takahashi, H. ^{[1
,2
]}

Sagayama, H. ^{[3
]}

Yamasaki, Y. ^{[1
,2
,4
]}

Ishiwata, S. ^{[1
,2
,5
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] Univ Tokyo, Quantum Phase Elect Ctr, Tokyo 1138656, Japan

[3] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[4] RIKEN, CEMS, Wako, Saitama 3510198, Japan

[5] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 22期

关键词：

CHARGE DISPROPORTIONATION; MAGNETIC-PROPERTIES; RNIO3; PEROVSKITES; GROUND-STATE; SRCOO3; DIFFRACTION; STRONTIUM; INSULATOR; CRYSTALS; CAFEO3;

D O I：

10.1103/PhysRevB.95.224440

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The GdFeO3-type perovskite CaCoO3 has 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 Co4+-perovskite oxides exhibit a variety of magnetic phases by the bandwidth control through the lattice distortion.

引用

页数：5

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