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American Institute of Physics, APL Materials, 1(1), p. 012105

DOI: 10.1063/1.4809547

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Lattice mismatch accommodation via oxygen vacancy ordering in epitaxial La0.5Sr0.5CoO3-δ thin films

Journal article published in 2013 by J. Gazquez, Shameek Bose, M. Sharma, M. A. Torija, S. J. Pennycook, C. Leighton, M. Varela ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The properties of complex oxide films depend sensitively on epitaxial strain. This strain affects bond lengths and angles, and defect types and densities, thus impacting physical properties. In this work we perform detailed characterization of depth-dependent strain in epitaxial La0.5Sr0.5CoO3-δ (LSCO) films on SrTiO3(001), SrTiO3(110), and LaAlO3(001) substrates, combining high resolution x-ray diffraction and scanning transmission electron microscopy, in addition to geometric phase analysis. We elucidate a fundamental link between strain state and O vacancy ordering in LSCO films, where lattice mismatch and crystallographic orientation can be used to manipulate the modulation vector of the long-range vacancy order, thus providing a new approach to tailor the properties of such films.