Abstract
The dielectric response of ferroelectric Sr 1- x Ca x TiO 3 (SCT) under photoexcitation has been investigated. We observed photoinduced Debye dispersion, which is similar to that observed in nominally pure SrTiO 3 . The temperature dependence of photoinduced Debye dispersion in SCT indicates that the origin of photoinduced Debye dispersion is the interfacial polarization between conductive and insulative regions. We assumed that conductive regions with mobile photocarriers are partly generated by photoexcitation and showed that the experimental results are well reproduced by the conductive-region model. We also observed a photoinduced reduction in ferroelectric phase transition temperature. This can be quantitatively explained by the reduction of Coulomb interaction between Ca-induced-dipoles due to the screening effect by mobile photocarriers.
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