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Enhanced ordering temperatures in antiferromagnetic manganite superlattices
Journal article   Peer reviewed

Enhanced ordering temperatures in antiferromagnetic manganite superlattices

S. J May, P. J Ryan, J. L Robertson, J.-W Kim, T. S Santos, E Karapetrova, J. L Zarestky, X Zhai, S. G. E te Velthuis, J. N Eckstein, …
Nature materials, v 8(11), pp 892-897
Nov 2009
DOI: https://doi.org/10.1038/nmat2557
PMID: 19838186

Abstract

The disorder inherent to doping by cation substitution in the complex oxides can have profound effects on collective-ordered states. Here, we demonstrate that cation-site ordering achieved through digital-synthesis techniques can dramatically enhance the antiferromagnetic ordering temperatures of manganite films. Cation-ordered (LaMnO3)m/(SrMnO3)2m superlattices show Néel temperatures (TN) that are the highest of any La1−xSrxMnO3 compound, ∼70 K greater than compositionally equivalent randomly doped La1/3Sr2/3MnO3. The antiferromagnetic order is A-type, consisting of in-plane double-exchange-mediated ferromagnetic sheets coupled antiferromagnetically along the out-of-plane direction. Through synchrotron X-ray scattering, we have discovered an in-plane structural modulation that reduces the charge itinerancy and hence the ordering temperature within the ferromagnetic sheets, thereby limiting TN. This modulation is mitigated and driven to long wavelengths by cation ordering, enabling the higher TN values of the superlattices. These results provide insight into how cation-site ordering can enhance cooperative behaviour in oxides through subtle structural phenomena.

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Collaboration types
Domestic collaboration
Web of Science research areas
Chemistry, Physical
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
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