Abstract
Ferroelectric phase transition of 18O-exchanged SrTiO3 (STO18) was investigated by Raman scattering as a function of the isotope exchange rate x. The result reasonably indicates the existence of the ideal soft mode-type quantum ferroelectric phase transition in STO18. In the vicinity of the critical concentration (xc = 33%), the coexistence of the paraelectric and ferroelectric regions was newly found, in drastic contrast to the homogeneous ferroelectric phase transition in the strongly exchanged STO18, whose x is sufficiently larger than xc. Near xc, the softening of the soft mode shows unusual rounding as a result of the coexistence. The present result indicates novel phase transition nature in the quantum ferroelectric phase transition of STO18, where dynamic heterogeneity plays an essential role.
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