Abstract
Polycrystalline samples of were synthesized at ambient pressure (AP) and high pressure (HP) conditions, respectively. Both samples are electrically semiconducting. The AP crystallizes in the perovskite structure with space group , consisting of face-sharing dimer units and corner-sharing octahedra. Magnetic measurements indicated that AP is antiferromagnetically ordered below 130 K. HP crystallizes in the perovskite structure too, but the face-sharing octahedral sites appear to be occupied by both and ions, whereas the corner-sharing site is occupied exclusively by . HP undergoes a high-temperature () weak ferromagnetic transition, which is much different from the antiferromagnetism of the AP phase. The long-range magnetic order of HP was confirmed by neutron powder diffraction. X-ray magnetic circular dichroism analysis supported ferromagnetic coupling between Os and Ni moments which leads to a spin arrangement, where the ferromagnetic moments mainly arise from ions.
1 More- Received 24 March 2020
- Accepted 21 May 2020
DOI:https://doi.org/10.1103/PhysRevMaterials.4.064420
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Published by the American Physical Society