Ferroelectric phase transition of SrTi¹⁸O₃ studied by brillouin scattering

Yuhji Tsujimi Research Institute for Electronic Science, Hokkaido University, Sapporo, 060-0812, Japan

Hiroki Hasebe Research Institute for Electronic Science, Hokkaido University, Sapporo, 060-0812, Japan

Ruiping Wang Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, 226-8503, Japan

Mitsuru Itoh Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, 226-8503, Japan

Toshirou Yagi Research Institute for Electronic Science, Hokkaido University, Sapporo, 060-0812, Japan

Abstract

Ferroelectric phase transition of SrTi¹⁸O₃ (87% ¹⁸O-exchanged SrTiO₃) has been investigated by the 90° Brillouin scattering experiment in the VV and VH scattering geometries. The c ⁴⁴ pure transverse acoustic mode splits into two modes below T _c≈25 K, indicating that the phase transition takes place (or begins) at T _c and that the phase realized below T _c has lower crystal symmetry than tetragonal one.

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Ferroelectric phase transition of SrTi¹⁸O₃ studied by brillouin scattering

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Ferroelectric phase transition of SrTi¹⁸O₃ studied by brillouin scattering