Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 70, Issue 3, Pages 648-651Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.70.648
Keywords
SrTiO3; oxgen isotope effect; Raman scattering; ferroelectric phase transition; quantum fluctuations
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Antiferrodistortive and ferroelectric soft modes of isotoped ferroelectric (SrTiO3xO3(1-x))-O-18-O-16 were observed for a single crystal of x = 0.87 with Raman scattering. The frequency of one of the antiferrodistortive modes exhibits a gradual change near the ferroelectric transition point at 24K (T-c) induced as the isotope effect. The spectral forms characteristic of the ferroelectric microscopic regions were also observed in both phases. The ferroelectric soft mode does not exhibit any softening behavior even just at T-c. The transition mechanism of the isotopically induced ferroelectric phase is discussed.
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