Charge ordering at the interface in (LaMnO3)2 n/(SrMnO3)n superlattices as the origin of their insulating state

Víctor Pardo, Antía S. Botana, Daniel Baldomir

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Abstract

We have performed ab initio calculations within the local density approximation + U method in the multilayered system (LaMnO3) 2n/(SrMnO3)n. Our results suggest a charge-ordered state that alternates Mn3+ and Mn4+ cations in a checkerboard in-plane pattern is developed at the interfacial layer, leading to a gap opening. Such an interfacial charge-ordered situation would be the energetically favored reconstruction between LaMnO3 and SrMnO3. This helps understanding the insulating behavior observed experimentally in these multilayers at intermediate values of n, whose origin is known to be due to some interfacial mechanism.

Original languageEnglish (US)
Article number81602
JournalApplied Physics Letters
Volume104
Issue number8
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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