Journal
APPLIED PHYSICS LETTERS
Volume 90, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2431448
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The authors report far-infrared dielectric properties of powder form ferroelectric SrTiO3. Terahertz time-domain spectroscopy (TDS) measurement reveals that the low-frequency dielectric response of SrTiO3 is a consequence of the lowest transverse optical (TO) soft mode TO1 at 2.70 THz (90.0 cm(-1)), which is directly verified by Raman spectroscopy. This result provides a better understanding of the relation of low-frequency dielectric function with the optical phonon soft mode for ferroelectric materials. Combining terahertz TDS with Raman spectra, the overall low-frequency optical phonon response of SrTiO3 is presented in an extended spectral range from 6.7 to 1000.0 cm(-1). (c) 2007 American Institute of Physics.
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