Change in magnetic properties of La2MnCoO6 in composite with CaCu3Ti4O12

•Composite of double and ordered double perovskites is investigated.•Magnetic properties of double perovskite La2MnCoO6 dramatically changed.•Cation ordering of La2MnCoO6 at the interface is largely suppressed.•Low TC vibronic ferromagnetism evolved at the expense of high TC ferromagnetism.•Local st...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-01, Vol.494, p.165847, Article 165847
Main Authors: Haque, Ariful, Ghosh, Debamalya, Dutta, Uma, Shukla, Ashish, Gayen, Arup, Mahata, Partha, Kundu, Asish K., Motin Seikh, Md
Format: Article
Language:English
Subjects:
Antiferromagnetic
Antiferromagnetism
Cation ordering
Cobalt
Double perovskite
Ferromagnetic
Ferromagnetic phases
Ferromagnetism
Grain boundaries
High temperature
Interface
Low temperature
Magnetic moments
Magnetic properties
Magnetism
Manganese ions
Perovskites
Quadruple perovskite
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Summary:•Composite of double and ordered double perovskites is investigated.•Magnetic properties of double perovskite La2MnCoO6 dramatically changed.•Cation ordering of La2MnCoO6 at the interface is largely suppressed.•Low TC vibronic ferromagnetism evolved at the expense of high TC ferromagnetism.•Local structural distortion across interface plays crucial role on magnetism. The magnetic properties of double perovskite La2MnCoO6 (LCMO) by making a composite with ordered double perovskite CaCu3Ti4O12 (CCTO) have been investigated. The composites were prepared by mixing the prior synthesized pure phases of LCMO and CCTO at different mole ratio. We observed that a new low temperature ferromagnetic phase (TC ~ 110 K) with lower magnetization value evolved at the expense of a high temperature ferromagnetic phase (TC ~ 228 K). The latter ferromagnetism is associated with ordering of Mn4+ and Co2+ ions. The new magnetic phase could be correlated to vibronic superexchange interaction between Mn3+–O–Co3+ cations, which would establish a ferromagnetic state. The genesis of this magnetic phase can be attributed to the local structural modulation of LCMO across the grain boundary in contact with CCTO. The lower magnetic moments and low temperature transitions have been attributed to the atomic disorder antiferromagnetic interactions (Mn4+–O–Mn4+ and Co2+–O–Co2+) akin to parent LCMO.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.165847