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Ferroelectrics Volume 499, 2016 - Issue 1: Proceedings of the Thirteenth European Meeting on Ferroelectricity (EMF-13) Part III
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Original Articles

Terahertz time-domain spectroscopy and Raman scattering studies of incipient ferroelectric BaZrO3

Md Al HelalGraduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, JapanCorrespondence[email protected]
,
Tatsuya MoriGraduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
&
Seiji KojimaGraduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
Pages 107-114 | Received 28 Jun 2015, Accepted 12 Nov 2015, Published online: 31 May 2016
 
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ABSTRACT

We have studied an incipient ferroelectric BaZrO3 single crystal with perovskite structure by terahertz time-domain and Raman scattering spectroscopies. The phonon-polariton dispersion relation of the low-frequency infrared active TO1 and TO2 modes was studied from the real and imaginary parts of the complex dielectric constants at 8 K. The experimentally observed complex polariton dispersion relations are discussed by a damped harmonic oscillator model. First-order Raman active modes, forbidden in cubic Pmm symmetry, have been observed in a BaZrO3 single crystal, indicating the lowering of cubic symmetry.

Funding

This work was supported by the Grants-in-Aid from MEXT, and JSPS for Young Scientists (B) (No. 24740194), and the Casio Science Promotion Foundation.

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