Anomalous variations in elastic properties of lead zirconate niobate-lead titanate single crystals in the vicinity of its ferroelectric phase transition

G. Shabbir; S. Kojima

doi:10.1209/0295-5075/105/57001

All issues

Volume 105 / No 5 (March 2014)

EPL, 105 5 (2014) 57001

Abstract

Issue		EPL Volume 105, Number 5, March 2014


Article Number		57001
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/105/57001
Published online		11 March 2014

EPL, 105 (2014) 57001

Anomalous variations in elastic properties of lead zirconate niobate-lead titanate single crystals in the vicinity of its ferroelectric phase transition

G. Shabbir¹ and S. Kojima²

¹ Physics Division, Directorate of Science, PINSTECH - Islamabad 45650, Pakistan
² Ultra-Broadband Spectroscopy Laboratory, Institute of Materials Science, University of Tsukuba Tsukuba, Ibaraki 305-8573, Japan

Received: 4 February 2014
Accepted: 25 February 2014

Abstract

The acoustic phonon mode anomalies in the paraelectric phase of tetragonal and rhombohedral (1 − x)Pb(Zn_1/3Nb_2/3)O_3^−xPbTiO₃ single crystals were systematically investigated by Brillouin light scattering measurements. The inverse relaxation time in the paraelectric phase of both crystals showed a stretched-type slowing-down temperature dependence approaching the structural phase transition temperature $(T_{\text{C}})$ instead of a normal critical slowing-down. The observed anomalous part of the elastic constant $(c_{11})$ in the paraelectric phase of the tetragonal crystal in the vicinity of $T_{\text{C}}$ , exhibited a $\log(T-T_{0}/T_{0})$ -type dependence in the temperature range from $T_{\text{C}}$ to $\sim T_{\text{C}}+80\ ^\circ \text{C}$ . On the other hand, the elastic constant of the rhombohedral ferroelectric crystal exhibited a deviation from such a temperature dependence. This was attributed to the interaction of acoustic phonon modes with strong polarization fluctuations and elastic deformation arising from the complex dynamics of polar nanoregions.

PACS: 77.80.Jk – Relaxor ferroelectrics / 78.35.+c – Brillouin and Rayleigh scattering; other light scattering / 77.80.B- – Phase transitions and Curie point

© EPLA, 2014

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.