Oxygen octahedral distortions in LaMO3/SrTiO3 superlattices

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

doi:10.1017/S1431927614000750

Title: Oxygen octahedral distortions in LaMO₃/SrTiO₃ superlattices

Journal Article · Thu Apr 24 00:00:00 EDT 2014 · Microscopy and Microanalysis

DOI:https://doi.org/10.1017/S1431927614000750· OSTI ID:1162066

Sanchez-Santolino, Gabriel ^[1]; Cabero, Mariona ^[1]; Varela, Maria ^[2]; Garcia-Barriocanal, Javier ^[1]; Leon, Carlos ^[1]; Pennycook, Stephen J. ^[3]; Santamaria, Jacobo ^[1]

Univ. Complutense de Madrid, Madrid (Spain)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. Complutense de Madrid, Madrid (Spain)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here we study the interfaces between the Mott insulator LaMnO₃ (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 spectrum 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. In conclusion, these findings will be discussed in view of the transport and magnetic differences found in previous studies.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; MAT2011-27470-C02; S2009/MAT-1756; 239739 STEMOX

OSTI ID:: 1162066

Journal Information:: Microscopy and Microanalysis, Vol. 20, Issue 03; ISSN 1431-9276

Publisher:: Microscopy Society of America (MSA)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: Oxygen octahedral distortions in LaMO₃/SrTiO₃ superlattices