Anomalous Phase Transition in Strained SrTiO$_3$ Thin Films

Feizhou He; B. O. Wells; S. M. Shapiro; M. v. Zimmermann; A. Clark; X. X. Xi

doi:10.1063/1.1589186

paper

Anomalous Phase Transition in Strained SrTiO $_{3}$ Thin Films

arXiv:cond-mat/0303317 · doi:10.1063/1.1589186

Abstract

We have studied the cubic to tetragonal phase transition in epitaxial SrTiO $_{3}$ films under various biaxial strain conditions using synchrotron X-ray diffraction. Measuring the superlattice peak associated with TiO $_{6}$ 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 T $_{C}$ as much as 50K 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 epitaxy strain and substrate clamping effect. The internal degrees of freedom (TiO $_{6}$ rotations) have become uncoupled from the overall lattice shape.

4 pages, 3 figures, REVTeX 4

Anomalous Phase Transition in Strained SrTiO3​ Thin Films

Abstract

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Anomalous Phase Transition in Strained SrTiO $_{3}$ Thin Films