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

Jaume Gázquez | Zendy; Shameek Bose | Zendy; Manish Sharma | Zendy; M. A. Torija | Zendy; Stephen J. Pennycook | Zendy; C. Leighton | Zendy; M. Varela | Zendy

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

Author(s) -

Jaume Gázquez,

Shameek Bose,

Manish Sharma,

M. A. Torija,

Stephen J. Pennycook,

C. Leighton,

M. Varela

Publication year - 2013

Publication title -

apl materials

Language(s) - English

Resource type - Journals

ISSN - 2166-532X

DOI - 10.1063/1.4809547

Subject(s) - materials science , epitaxy , vacancy defect , condensed matter physics , transmission electron microscopy , crystallography , diffraction , thin film , lattice (music) , scanning transmission electron microscopy , lattice constant , optics , nanotechnology , chemistry , physics , layer (electronics) , acoustics

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

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