Abstract
Temperature-dependent and photoinduced x-ray absorption spectra were measured in the Ti-$K$ edge of $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$. The change in the spectra is explained by a collapse of the inversion symmetry, accompanied by a relative local vibration of the Ti atom. In particular, photoinduced x-ray absorption measurements show that the single axial vibration of the Ti atom along the Ti-O direction was excited by UV irradiation only in the quantum paraelectric phase.
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