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Hiroki Taniguchi,Masaki Takesada,Mitsuru Itoh,Toshirou Yagi 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
The oxygen-isotope exchange eect on the ferroelectric micro-regions (FMR) in SrTiO3 is investigated by Raman scattering in the low-temperature region near 1 K by using a 3He cryostat. With decreasing temperature, the intensity of the FMR spectra decreases and a sharp peak newly appears with increasing intensity. The sharp peak is assigned to be the polar Eu mode activated by local symmetry breaking induced by the growth of FMR.
Photoinduced Effect in Li-doped ZnO studied by Raman Scattering
Daisuke Kagami,Masaki Takesada,Akira Onodera,Hiroyasu Satoh 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Optical phonon behavior and photoexcited effect in Li-doped ZnO ceramics were investigated at around the ferroelectric phase transition point Tc = 366 K by Raman scattering using a double monochromator. The temperature dependence of Raman scattering spectra was obtained from 300 K to 500 K through Tc. The A1 and E2 modes did not show any anomaly at around Tc accompanied to the ferroelectric phase transition. The result indicates that the mechanism of the ferroelectric phase transition does not originate in an order-disorder type with the size mismatch of doped Li and Zn cations, but in the electronic ferroelectric phase transition with a change of electronic state. The photoinduced effect was observed in the A1 mode with ferroelectric polarization at around Tc under ultraviolet (UV) excitation with energies higher than the band gap energy.
Investigation of Ferroelectric Transition in SrTi18O3 under Hydrostatic Pressure
Masaaki Kurita,Alain Moreac,Jean-Claude Ameline,Masaki Takesada,Mitsuru Itoh,Shinya Koshihara,Tadahiko Ishikawa 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
SrTi18O3 shows a ferroelectric transition at 19.7 K at ambient pressure, and the appearance of new Raman peaks associated with this ferroelectric transition has been reported. This is the rst report of the observation of the change in the Raman spectra under high pressure. The ferroelectric-transition temperature probed by dielectric-property measurements decreases with increasing pressure (P), and the ferroelectric order seems to disappear for the P > 500 bar. Quite parallel behavior has been conrmed for the P dependence of the intensity of the Raman band characteristic of the ferroelectric state.