Journal
PHILOSOPHICAL MAGAZINE
Volume 93, Issue 13, Pages 1549-1562Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2012.747010
Keywords
perovskite; domain engineering; low symmetry; shear strain relaxation; thin films
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Funding
- Norwegian Research Council [10239707]
- Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
- Swedish Research Council (VR)
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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.
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