Anomalous Phase Transition in Strained SrTiO$_3$ Thin Films

Details Anomalous Phase Transition in Strained SrTiO$_3$ Thin Films Anomalous Phase Transition in Strained SrTiO$_3$ Thin Films

2003-03-17

arxiv.org/abs/cond-mat/0303317v1

Appl. Phys. Lett. 83, 123 (2003)

Physics

Condensed Matter

4 pages, 3 figures, REVTeX 4

Scientific paper

10.1063/1.1589186

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.

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