Abstract
We demonstrate the dramatic effect of film thickness on the ferroelectric phase transition temperature Tc in strained BaTiO3 films grown on SrTiO3 substrates. Using variable-temperature ultraviolet Raman spectroscopy enables measuring Tc in films as thin as 1.6 nm, and a film thickness variation from 1.6 to 10 nm leads to Tc tuning from 70 to about 925 K. Raman data are consistent with synchrotron x-ray scattering results, which indicate the presence of 180° domains below Tc, and thermodynamic phase-field model calculations of Tc as a function of thickness.
| Original language | English |
|---|---|
| Article number | 177601 |
| Journal | Physical Review Letters |
| Volume | 103 |
| Issue number | 17 |
| DOIs | |
| State | Published - Oct 21 2009 |
| Externally published | Yes |