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강상관계 물질 연구단
강상관계 물질 연구단
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Crystal and Magnetic Structures of La2CoPtO6 Double Perovskite

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Title
Crystal and Magnetic Structures of La2CoPtO6 Double Perovskite
Author(s)
Sanghyun Lee; Min-Cheol Lee; Yoshihisa Ishikawa; Ping Miao; Shuki Torii; Choongjae Won; Kyungdong Lee; namjung Hur; Deok-Yong Cho; Takashi Kamiyama
Publication Date
2018-09
Journal
ACS Omega, v.3, no.9, pp.11624 - 11632
Publisher
ACS Publications
Abstract
We investigated the crystal structure and magnetic structure in cobaltite-platinate double perovskite of La2CoPtO6, employing various techniques of X-ray diffraction, neutron diffraction, and the extended X-ray absorption fine structure analysis. It is shown that the crystal symmetry is maintained as P21/n in the temperature range of <500 °C, whereas the lattice constants and the Co-Co distances undergo a continuous structural evolution toward the high-symmetry phases with increasing temperature. The Co-O bonds were overall longer and had a larger degree of structural and thermal disorders than the Pt-O bonds. As for the magnetism, an antiferromagnetic order is stabilized in the Co2+ sublattice at temperatures below 28 K. It is demonstrated that owing to the substantial distortions (quantified by a distortion parameter σ > 0.03 Å) of the Co-Co networks, the system is not subject to spin frustration effect. Details in the magnetic structure are determined; at 12 K, the Co magnetic moment was (0.8, 0, 2.7) Bohr magneton, the magnetic propagation vector was (-0.5, 0, 0.5), and the magnetic symmetry was preferably Δ1(Ag). © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5181
ISSN
2470-1343
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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