Abstract
The ultraviolet (UV) photoexcited effect in the bismuth layered perovskite oxide BaBi4Ti4O15 was investigated by Brillouin scattering using a Sandercock-type tandem Fabry-Perot interferometer on six-pass stage with the finesse more than 100. The temperature dependences of Brillouin scattering spectra were obtained with and without UV photoirradiation with energies higher than the band gap energy from 300 K to 900 K. A central peak and acoustic phonon mode show anomalies from 600 K to 800 K under a UV photoirradiation. The results indicate that the UV photoirradiation affects the quasi-longrange ferroelectric fluctuation near the ferroelectric phase transition point.
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