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Strain relaxation and oxygen superstructure modulation in epitaxial Sr4Fe6O13±δ films

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7 Author(s)
Santiso, J. ; Institut de Ciència de Materials de Barcelona-CSIC, Campus UAB, 08193 Bellaterra, Spain ; Pardo, J.A. ; Solis, C. ; Garcia, G.
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The compressive strain induced in epitaxial Sr4Fe6O13±δ (SFO) films of different thicknesses grown on SrTiO3 substrates is partially released by the modulation of the incommensurate oxygen superstructure along the a-axis parallel to the substrate [q=αam*, superspace group Xmmm(α00)0s0]. The modulation α value varies proportionally to the in-plane a-parameter in a continuous range from 0.41, for fully strained thin films of about 20–30 nm, to 0.44 for partially-relaxed thicker films of about 280 nm. This mechanism is responsible for the observed slow relaxation of the cell structure upon the film thickness increase in comparison with an equilibrium misfit dislocation-mediated relaxation.

Published in:

Applied Physics Letters  (Volume:86 ,  Issue: 13 )

Date of Publication:

Mar 2005

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