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Ferroelectrics Volume 538, 2019 - Issue 1: Proceedings of the Joint International 14th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity (RCBJSF-2018), Part I of II
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SECTION C: Relaxor Ferroelectrics

Vibrational Dynamics of Ferroelectric K(Ta1-xNbx)O3 Studied by Inelastic Light Scattering

M. M. RahamanGraduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan; ;Department of Materials Science and Engineering, University of Rajshahi, Rajshahi, Bangladesh; View further author information
,
S. TsukadaFaculty of Education, Shimane University, Matsue, Japan; View further author information
,
Š. SvirskasFaculty of Physics, Vilnius University, Vilnius, LithuaniaView further author information
,
J. BanysFaculty of Physics, Vilnius University, Vilnius, LithuaniaView further author information
&
S. KojimaGraduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan; Correspondence[email protected] [email protected]
View further author information
Pages 96-104 | Received 14 May 2018, Accepted 31 Oct 2018, Published online: 17 May 2019
 
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Abstract

The Fano resonance of non-doped KTa1-xNbxO3 (x = 0.32) single crystals was investigated by the Raman spectroscopy. The intensity of central peak (CP) and parameters of the Fano resonance revealed a significant anomaly in the vicinity of the Curie temperature, TC = 259 K. The vibrational dynamics and the symmetry breaking in the cubic phase are discussed in the framework of weak random fields. It is concluded that the coupling between continuum states induced by polar nanoregions (PNRs) and a transverse optic (TO2) phonon at about 194 cm−1 is the origin of a Fano resonance in non-doped KTN crystals.

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Funding

This study was supported in part by JSPS KAKENHI Grant Number JP17K05030JSPS, open partnership joint research projects No. 16039901 between Japan and Lithuania, and a grant (No. LJB-1/2016) from the research council of Lithuania.

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