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(Color online) Room temperature reciprocal space maps of the and , (444), (620), and (44-4) Bragg reflections. The fact that the (260) and (620) peak positions are different from the (444) and (44-4) positions indicates an orthorhombic unit cell.
(Color online) Distance between and peaks in the reciprocal space as a function of temperature indicating an orthorhombic to tetragonal transition. The inset shows the disappearance of peak as the symmetry of the film changes to tetragonal. The black horizontal line indicates the separation between the and peak positions (see Fig. 1).
Intensity of the peak as a function of temperature. The nonzero intensity indicates possesses a tetragonal symmetry up to .
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