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Soft Modes in SrTi18O3 Studied by Light Scattering and Dielectric Measurements
Yohei Nakata,Mika Kobayashi,Mitsuru Itoh,Ruiping Wang,Toshirou Yagi,Yuhji Tsujimi 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Light-scattering and dielectric easurements have been carried out, mainly in SrTi18O3, to clarify the physical origin of the two modes (Eu1 and Eu2) which were supposed to originate from a doubly degenerated ferroelectric Eu soft mode. The combined results of both measurements strongly suggest that the Eu1 and Eu2 modes correspond to the polarization uctuation parallel to the spontaneous polarization Ps (the mode of A1 symmetry) and to that perpendicular to Ps (the mode of B2 symmetry), respectively.