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Insights into cationic ordering in Re-based double perovskite oxides

Title
Insights into cationic ordering in Re-based double perovskite oxides
Authors
CHOI, SI YOUNGT. -W. LimS. -D. KimK. -D. SungY. -M. RhyimH. JeenJ. YunK. -H. KimK. -M. SongS. LeeS. -Y. ChungM. Choi
Date Issued
Jan-2016
Publisher
NATURE PUBLISHING GROUP
Abstract
Cationic ordering in Sr2FeReO6 (SFRO) and Sr2CrReO6 (SCRO) is investigated using magnetic property measurement, atomic-scale imaging, and first-principles calculations. We find that the nature of cationic ordering strongly depends on the host oxides, although they have the same crystal symmetry and chemical formula. Firstly, adding Re is effective to enhance the cationic ordering in SFRO, but makes it worse in SCRO. Secondly, the microscopic structure of antisite (AS) defects, associated with the level of cationic ordering, is also distinguishable; the AS defects in SFRO are clustered in the form of an antiphase-boundary-like feature, while they are randomly scattered in SCRO. Interestingly, we observe that the clustered AS defects deteriorate the ferromagnetism more than the scattered defects. Our findings elevate the importance of the AS defect configuration as well as the amount of defects in terms of magnetic property.
URI
http://oasis.postech.ac.kr/handle/2014.oak/39293
ISSN
2045-2322
Article Type
Article
Citation
Scientific Reports, vol. 6, 2016-01
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