Physics – Condensed Matter – Materials Science
Scientific paper
2010-02-05
Physical Review B 82, 014110 (2010)
Physics
Condensed Matter
Materials Science
23 pages, 11 figures
Scientific paper
Epitaxial strain is a proven route to enhancing the properties of complex oxides, however, the details of how the atomic structure accommodates strain are poorly understood due to the difficulty of measuring the oxygen positions in thin films. We present a general methodology for determining the atomic structure of strained oxide films via x-ray diffraction, which we demonstrate using LaNiO3 films. The oxygen octahedral rotations and distortions have been quantified by comparing the intensities of half-order Bragg peaks, arising from the two unit cell periodicity of the octahedral rotations, with the calculated structure factor. Combining ab initio density functional calculations with these experimental results, we determine systematically how strain modifies the atomic structure of this functional oxide.
Bhattacharya Arnab
Karapetrova E.
Kim Won-Jang
May S. J.
Rondinelli James M.
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