Structural phases driven by oxygen vacancies at the La0.7Sr0.3MnO3/SrTiO3 hetero-interface

Nord, M., Vullum, P.E., Moreau, M., Boschker, J.E., Selbach, S.M., Holmestad, R. and Tybell, T. (2015) Structural phases driven by oxygen vacancies at the La0.7Sr0.3MnO3/SrTiO3 hetero-interface. Applied Physics Letters, 106(4), 041604. (doi: 10.1063/1.4906920)

Abstract

An oxygen vacancy driven structural response at the epitaxial interface between La0.7Sr0.3MnO3 films and SrTiO3 substrates is reported. A combined scanning transmission electron microscopy and electron energy loss spectroscopy study reveal the presence of an elongated out-of-plane lattice parameter, coupled to oxygen vacancies and reduced manganese oxidation state at the La0.7Sr0.3MnO3 side of the interface. Density functional theory calculations support that the measured interface structure is a disordered oxygen deficient brownmillerite structure. The effect of oxygen vacancy mobility is assessed, revealing an ordering of the vacancies with time.

• Item Type: Articles
• Additional Information: This project was supported by the Norwegian Research Council under Project No. 10239707 and The Norwegian PhD Network on Nanotechnology for Microsystems. Takeshi Kasama at Center for Electron Nanoscopy at the Technical University of Denmark (CEN-DTU) was thankfully acknowledged for support with the STEM-EELS investigations. The Norwegian Metacenter for Computational Science (Notur) was acknowledged for providing computational resources for DFT-calculations through the project NN9301K.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Nord, Dr Magnus
• Authors: Nord, M., Vullum, P.E., Moreau, M., Boschker, J.E., Selbach, S.M., Holmestad, R., and Tybell, T.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Applied Physics Letters
• Publisher: AIP Publishing
• ISSN: 0003-6951
• ISSN (Online): 1077-3118
• Published Online: 29 January 2015
• Copyright Holders: Copyright © 2015 AIP Publishing
• First Published: First published in Applied Physics Letters 106(4): 041604
• Publisher Policy: Reproduced in accordance with the publisher copyright policy