Abstract
A quadruple perovskite oxide was synthesized by high-pressure annealing. This compound crystallizes in an - and -site ordered quadruple perovskite structure with space group . The charge combination is determined to be by bond valence sum analysis and x-ray absorption spectroscopy. In contrast to other isostructural compounds with a single magnetic transition, a long-range antiferromagnetic phase transition originating from the -site sublattice is found to occur at . Subsequently, the spin coupling between the -site and -site ions contributes to a ferrimagnetic transition around . Strong electrical insulating behavior is identified by optical measurement with an energy gap of approximately 3.75 eV. The mechanisms of the spin interactions are discussed in detail.
2 More- Received 13 May 2020
- Revised 22 November 2020
- Accepted 22 December 2020
DOI:https://doi.org/10.1103/PhysRevB.103.014414
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