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In-plane structural order of domain engineered La0.7Sr0.3MnO3 thin films
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2013 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 93, no 13, 1549-1562 p.Article in journal (Refereed) Published
Abstract [en]

We present a detailed structural study of tensile-strained La0.7Sr0.3MnO3 thin films. We use the substrate miscut to control the number of rhombohedral variants in the films and study the in-plane order and structural distortions. Using high-resolution X-ray diffraction, we demonstrate that step-edge induced lattice modulations occur in 4-variant films, whereas periodic twinning is the dominant in-plane order for 2-variant films. We show that the in-plane twinning angle is almost completely relaxed. However, the relaxation of shear strain by the out-of-plane twinning angle and the monoclinic distortion is only partial. Furthermore, the film thickness dependence of the domain width reveals that domain formation is a universal mechanism for shear strain relaxation. Finally, we show that the structural response to the transition from the paramagnetic to the ferromagnetic phase of La0.7Sr0.3MnO3 at 345K is smaller in 4-variant films compared to 2-variant films.

Place, publisher, year, edition, pages
2013. Vol. 93, no 13, 1549-1562 p.
Keyword [en]
perovskite, domain engineering, low symmetry, shear strain relaxation, thin films
National Category
Condensed Matter Physics Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
URN: urn:nbn:se:uu:diva-203680DOI: 10.1080/14786435.2012.747010ISI: 000319109600006OAI: oai:DiVA.org:uu-203680DiVA: diva2:637417
Available from: 2013-07-18 Created: 2013-07-17 Last updated: 2014-01-31Bibliographically approved

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Mathieu, Roland
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