Oxygen octahedral distortions in LaMO3/SrTiO3 superlattices

Gabriel Sanchez-Santolino, Mariona Cabero, Maria Varela, Javier Garcia-Barriocanal, Carlos Leon, Stephen J. Pennycook, Jacobo Santamaria

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In this work we study the interfaces between the Mott insulator LaMnO 3 (LMO) and the band insulator SrTiO3 (STO) in epitaxially grown superlattices with different thickness ratios and different transport and magnetic behaviors. Using atomic resolution electron energy-loss spectral imaging, we analyze simultaneously the structural and chemical properties of these interfaces. We find changes in the oxygen octahedral tilts within the LaMnO3 layers when the thickness ratio between the manganite and the titanate layers is varied. Superlattices with thick LMO and ultrathin STO layers present unexpected octahedral tilts in the STO, along with a small amount of oxygen vacancies. On the other hand, thick STO layers exhibit undistorted octahedra while the LMO layers present reduced O octahedral distortions near the interfaces. These findings are discussed in view of the transport and magnetic differences found in previous studies.

Original languageEnglish (US)
Pages (from-to)825-831
Number of pages7
JournalMicroscopy and Microanalysis
Volume20
Issue number3
DOIs
StatePublished - Jun 2014

Keywords

  • complex oxides
  • electron energy-loss spectroscopy
  • manganites
  • oxygen octahedral tilts
  • oxygen vacancies
  • scanning transmission electron microscopy
  • spectrum imaging

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