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(a) Mosaic spread on the sample surface. (b) X-ray diffraction pattern of with radiation at room temperature. The sample was grown along the c-axis. (c) -zone axis electron diffraction pattern of . (d) -zone high-resolution transmission electron microscope image.
Photoinduced reflectance change plotted as a function of time-delay for various temperatures. The reflectivity data are shifted along the vertical axis for clarity.
FT amplitudes of coherent oscillation. The dashed line represents the frequency of the high-temperature region.
Temperature dependence of the phonon amplitudes obtained by the model analysis using Eq. (3). The phonon amplitude above is plotted in circles, and below in squares. The lines are visual guides.
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