Stabilization of ferromagnetic ordering in cobaltite double perovskites of La2CoIrO6 and La2CoPtO6

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Title
Stabilization of ferromagnetic ordering in cobaltite double perovskites of La2CoIrO6 and La2CoPtO6
Author(s)
Min-Cheol Lee; Chang Hee Sohn; So Yeon Kim; Kyungdong Lee; Choongjae Won; Namjung Hur; Jooyun Kim; Deok-Yong Cho; Taewon Noh
Publication Date
2015-08
Journal
JOURNAL OF PHYSICS-CONDENSED MATTER, v.27, no.33, pp.336002 -
Publisher
IOP PUBLISHING LTD
Abstract
We investigated the local electronic structure and magnetic properties of the cobaltite double perovskites La2CoIrO6 and La2CoPtO6 using Co L-2,L-3-edge x-ray absorption spectroscopy and x-ray magnetic circular dichroism. Despite similarity in the local electronic structure (Co2+ high-spin states) as well as in the crystal structure (P2(1)/n), only La2CoIrO6 exhibits substantial orbital and spin magnetic moments of Co2+, whereas they are much weaker in the case of La2CoPtO6. This composition dependence is consistent with the results of magnetization measurements. The details of the mechanism of ferromagnetic ordering in the Co2+ sublattice in La2CoIrO6 and the lack thereof in La2CoPtO6 are explained in terms of the orbital hybridization of the Co minority-spin t(2g) state and the Ir/Pt j(eff) = 1/2 state
URI
https://pr.ibs.re.kr/handle/8788114/1919
ISSN
0953-8984
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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