Physics – Condensed Matter – Materials Science
Scientific paper
2004-06-29
J. Phys.: Condens. Matter 16, 6763-6769 (2004)
Physics
Condensed Matter
Materials Science
subm. to J. Phys.: Condens. Matter
Scientific paper
10.1088/0953-8984/16/37/012
Time-domain THz transmission experiment was performed on a $\rm SrBi_2Ta_2O_9$ film deposited on sapphire substrate. Temperatures between 300 and 923 K were investigated and complex permittivity spectra of the film were determined. The lowest frequency optic phonon near 28 cm$^{-1}$ reveals a slow monotonic decrease in frequency on heating with no significant anomaly near the phase transitions. We show that the dielectric anomaly near the ferroelectric phase transition can be explained by slowing down of a relaxational mode, observed in the THz spectra. A second harmonic generation signal observed in a single crystal confirms a loss of center of symmetry in the ferroelectric phase and a presence of polar clusters in the intermediate ferroelastic phase.
Kadlec Christelle
Kadlec F.
Kamba Stanislav
Kroupa J.
Kuzel P.
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