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

Article

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

DOI  :  10.1103/PhysRevB.95.224440

来源: SCIE

【 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.

【 授权许可】

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