Separation of the D4h and Oh Phases near the Surface of SrTiO3

Abstract

Elastic compliance data are reported for thin plates of ${\mathrm{SrTiO}}_3$. An analysis is presented in terms of two spatially separated phases, the one of low symmetry residing near the surface. From the thickness of the surface layers, a static correlation length $\xi ={\xi }_0{(\frac{T}{T_c}-1)}^{\nu }$, with ${\xi }_0=(0.35\mathrm{}\pm 0.02)$ μm and $\nu =-0.68\mathrm{}\pm 0.03$, is deduced.