Dielectric response of soft mode in ferroelectric SrTiO3
Jiaguang Han, Fan Wan, Zhiyuan Zhu, Weili Zhang
TL;DR
This study investigates the dielectric properties of ferroelectric SrTiO3 powder using terahertz spectroscopy and Raman analysis, revealing the role of the soft mode in its low-frequency dielectric response.
Contribution
It provides a detailed analysis linking the low-frequency dielectric response of SrTiO3 to its soft optical phonon mode using combined THz-TDS and Raman spectroscopy.
Findings
Identification of the soft mode at 2.70 THz as key to dielectric response
Extended spectral analysis from 6.7 to 1000.0 1/cm
Verification of soft mode via Raman spectroscopy
Abstract
We report far-infrared dielectric properties of powder form ferroelectric SrTiO3. Terahertz time-domain spectroscopy (THz-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 1/cm), 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 THz-TDS with Raman spectra, the overall low-frequency optical phonon response of SrTiO3 is presented in an extended spectral range from 6.7 1/cm to 1000.0 1/cm.
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