Isotope-Induced Ferroelectric Phase Transition in Strontium Titanate Only by a Decrease in Zero-Point Vibration Frequency

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概要

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• The possibility of the ferroelectric phase transition in SrTi${^{18}}$O3 only by decreasing the frequency of zero-point vibration due to the substitution of 18O for 16O is investigated by the self-consistent phonon approximation (SCPA) of an anharmonic lattice vibration system. The SC equation for the soft-mode frequency is shown to be described by only two parameters; the paraelectric Curie–Weiss temperature $T_{0}$ in SrTi${^{16}}$O3 and the quantum factor $T_{1}$ inversely proportional to the square root of the effective mass $M$. The experimental finding that $T_{\text{c}}=0$ in the mixed crystal SrTi(18Ox${^{16}}$O1-x)3 at $x=0.33$ is used to determine $T_{1}$ at this concentration and that at another $x$ using only the ratio of $M$. The transition temperature $T_{\text{c}}$ in SrTi${^{18}}$O3 is numerically calculated for comparison with the experimental value. Several factors determining $T_{\text{c}}$ are discussed on the basis of numerical results.

• Physical Society of Japanの論文
• 2010-02-15

著者

• Tokunaga Masaharu

  Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan

• Aikawa Yutaka

  Taiyo Yuden Co., Ltd., Takasaki, Gunma 370-3347, Japan

関連論文

• Theory of Instability Phenomena and Its Application to Melting of Cubic Metals
• Instability of the Order-Disorder Ferroelectrics
• Self-Consistent Anharmonic Theory and Its Application to the Isotope Effect on Ferroelectric Phase Transition in BaTiO3 Crystal
• Isotope-Induced Ferroelectric Phase Transition in Strontium Titanate Only by a Decrease in Zero-Point Vibration Frequency

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