Abstract
There has been significant interest in a quantum paraelectric material strontium titanate (SrTiO3), and its lattice dynamics and unusual dielectric character have been extensively studied. In low temperatures, its dielectric constant increases up to about 30 000. The dielec‐ tric constant increases extraordinarily with decreasing temperature while the paraelectric phase is stabilized by quantum fluctuations without any ferroelectric phase transition even below the classical Curie temperature Tc=37 K [1]. In SrTiO3, a ferroelectric transition is easi‐ ly induced by a weak perturbation such as an uniaxial stress [2], an isotopic substitution of oxygen 18 for oxygen 16 [3], and an impurity doping [4,5].
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