Abstract
We performed the X-ray Laue topography of strontium titanate from 300 K down to 4 K through the cubic-tetragonal phase transition temperature T a=105 K. We found that the {1 1 0 } domain boundaries formed below T a clearly showed the bright and dark stripe contrasts. The appearance of the contrasts depends on the diffraction vector g . The boundaries parallel to g show the strongest contrasts, while those normal to g show no contrasts. This proves the spontaneous deformation around the boundaries. The difference between the X-ray intensities of the adjacent bright and dark stripes shows the same temperature dependence as the order parameter. The present X-ray topography provides a new method of studying order parameters in structural phase transitions.
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