title: Insights into cationic ordering in Re-based double perovskite oxides.
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.
authors.affiliation: Department of Nano Science and Engineering, Kyungnam University, Changwon 631-701, Korea.|Materials Modeling and Characterization Department, Korea Institute of Materials Science, Changwon 642-831, Korea.
authors.forename: Tae-Won
authors.initials: TW
authors.lastname: Lim
authors.affiliation: Materials Modeling and Characterization Department, Korea Institute of Materials Science, Changwon 642-831, Korea.
authors.forename: Sung-Dae
authors.initials: SD
authors.lastname: Kim
authors.affiliation: Materials Modeling and Characterization Department, Korea Institute of Materials Science, Changwon 642-831, Korea.
authors.forename: Kil-Dong
authors.initials: KD
authors.lastname: Sung
authors.affiliation: Materials Modeling and Characterization Department, Korea Institute of Materials Science, Changwon 642-831, Korea.
authors.forename: Young-Mok
authors.initials: YM
authors.lastname: Rhyim
authors.affiliation: Department of Physics, Pusan National University, Busan 609-735, Korea.
authors.forename: Hyungjeen
authors.initials: H
authors.lastname: Jeen
authors.affiliation: Department of Nano Science and Engineering, Kyungnam University, Changwon 631-701, Korea.
authors.forename: Jondo
authors.initials: J
authors.lastname: Yun
authors.affiliation: School of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea.
authors.forename: Kwang-Ho
authors.initials: KH
authors.lastname: Kim
authors.affiliation: Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea.
authors.forename: Ki-Myung
authors.initials: KM
authors.lastname: Song
authors.affiliation: Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea.
authors.forename: Seongsu
authors.initials: S
authors.lastname: Lee
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Sung-Yoon
authors.initials: SY
authors.lastname: Chung
authors.affiliation: Materials Modeling and Characterization Department, Korea Institute of Materials Science, Changwon 642-831, Korea.
authors.forename: Minseok
authors.initials: M
authors.lastname: Choi
authors.affiliation: Materials Modeling and Characterization Department, Korea Institute of Materials Science, Changwon 642-831, Korea.
authors.forename: Si-Young
authors.initials: SY
authors.lastname: Choi