Atomic-Scale Determination of Cation and Magnetic Order in the Triple Perovskite Sr3Fe2ReO9
Source abstract
Abstract
Abstract Pseudo-cubic (pc) perovskite oxides (ABO3) that can have different magnetic cations with different types and degrees of order at B sites have attracted considerable interest as a result of their tunable magnetic properties. Nanoscale inhomogeneity in cation order on the B sites can lead to different magnetic ground states and electronic band structures in local sample regions. Here, we determine cation order on the atomic scale in a nanosized Sr3Fe2ReO9 phase that has a 1:2 B-site-ordered triple perovskite structure using aberration-corrected analytical transmission electron microscopy (TEM), revealing that the Fe and Re cations form tripled-layered repeats with –[Fe–Fe–Re]n– sequences along [111]pc and an ordering vector of 1/3[111]*. To the best of our knowledge, this 1:2 B-site-ordered triple perovskite Sr3Fe2ReO9 phase has not been reported before. Based on a relaxed theoretical model that is consistent with the experimental images, density functional theory calculations are performed to determine the magnetic ground states and exchange parameters of the newly discovered Sr3Fe2ReO9 phase, in which nearest-neighbour Fe and Re cations are coupled antiferromagnetically. This combination of aberration-corrected analytical TEM and ab initio calculations provides physical insight into cation order and magnetic coupling in perovskite oxides at the atomic level.
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Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics · Multiferroics and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Wolfson Catalysis Centre, Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford , Oxford OX1 3QR , UK
Department of Materials, University of Oxford , Oxford OX1 3PH , UK
TRACE EM Unit and Department of Materials Science and Engineering, City University of Hong Kong , Kowloon 999077, Hong Kong SAR , People’s Republic of China
City University of Hong Kong Matter Science Research Institute (Futian, Shenzhen) , Shenzhen 518048 , People’s Republic of China
Nanomanufacturing Laboratory (NML), City University of Hong Kong Shenzhen Research Institute , Shenzhen 518057 , People’s Republic of China
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C), Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang 37673 , South Korea
Central Facility for Electron Microscopy, RWTH Aachen University , 52074 Aachen , Germany
Funding
Sino-German Center for Research Promotion · National Natural Science Foundation of China · Science, Technology and Innovation Commission of Shenzhen Municipality · Science and Technology Department of Sichuan Province · Innovation and Technology Fund · CityU Strategic Interdisciplinary Research Grant · City University of Hong Kong · City University of Hong Kong Shenzhen Research Institute
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