2003/03/17 by Feizhou He, B. O. Wells, S. M. Shapiro +3 · 2 citations
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Electronic and Structural Properties of Oxides #Ferroelectric and Piezoelectric Materials #cond-mat
paper · pdf · doi:10.1063/1.1589186
published as Appl. Phys. Lett. 83, 123 (2003) · 4 pages, 3 figures, REVTeX 4
arxiv created 2003/03/17 · openalex publication_date 2003/07/03 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have studied the cubic-to-tetragonal phase transition in epitaxial SrTiO3 films under various biaxial strain conditions using synchrotron x-ray diffraction. Measuring the superlattice peak associated with TiO6 octahedra rotation in the low-temperature tetragonal phase indicates the presence of a phase transition whose critical temperature is a strong function of strain, with TC as much as 50 K above the corresponding bulk temperature. Surprisingly, the lattice constants evolve smoothly through the transition, with no indication of a phase change. This signals an important change in the nature of the phase transition due to the epitaxial strain and substrate clamping effect. The internal degrees of freedom (TiO6 rotations) evolve independently from the overall lattice shape.