Critical behavior of ferroelectricSrTi18O3

Abstract

Accurate measurements of the temperature dependence of spontaneous polarization and dielectric constant in the vicinity of the phase transition from the paraelectric to the ferroelectric phase in ${\mathrm{SrTi}}^{18}{\mathrm{O}}_{3}$ were performed. Dielectric constant and soft mode frequency can be well described [Minaki et al., J. Korean Phys. Soc. 42, S1290 (2003); Takesada et al. (unpublished)] with the Salje expression [Salje et al., Z. Phys. B: Conden. Matter 82, 399 (1991)] which gives $\ensuremath{\gamma}=1$ close to ${T}_{c}$. The critical exponents $\ensuremath{\beta}$ and $\ensuremath{\gamma}$ have classical Landau values.