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Oxygen Octahedral Distortions in LaMO3/SrTiO3 Superlattices

Published online by Cambridge University Press:  24 April 2014

Gabriel Sanchez-Santolino ,
Mariona Cabero ,
Maria Varela ,
Javier Garcia-Barriocanal ,
Carlos Leon ,
Stephen J. Pennycook  and
Jacobo Santamaria
Gabriel Sanchez-Santolino
Affiliation:
GFMC, Departamento de Fisica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain
Mariona Cabero
Affiliation:
GFMC, Departamento de Fisica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain
Maria Varela*
Affiliation:
GFMC, Departamento de Fisica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Javier Garcia-Barriocanal
Affiliation:
GFMC, Departamento de Fisica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain
Carlos Leon
Affiliation:
GFMC, Departamento de Fisica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain
Stephen J. Pennycook
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA
Jacobo Santamaria
Affiliation:
GFMC, Departamento de Fisica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain
*
*Corresponding author.mvarela@ornl.gov
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Abstract

In this work 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 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.

Keywords

scanning transmission electron microscopyelectron energy-loss spectroscopycomplex oxidesspectrum imagingmanganitesoxygen octahedral tiltsoxygen vacancies
Type
EDGE Special Issue
Information
Microscopy and Microanalysis , Volume 20 , Issue 3 , June 2014 , pp. 825 - 831
Copyright
© Microscopy Society of America 2014 

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