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A possible scenario for two soft branches in PMN

SYSNO ASEP	0365357
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	A possible scenario for two soft branches in PMN
Author(s)	Kempa, Martin (FZU-D)_{RID, ORCID} Hlinka, Jiří (FZU-D)_{RID, ORCID}
Source Title	Phase Transitions. - : Taylor & Francis - ISSN 0141-1594 Roč. 84, 9-10 (2011), s. 784-788
Number of pages	5 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	PMN relaxor ; waterfall phenomenon ; phonon dispersions ; inelastic scattering
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	GAP204/10/0616 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000299704600008
DOI	10.1080/01411594.2011.558278
Annotation	The acoustic–optic mode coupling model in lead-based perovskite relaxors has been extended by taking into account the two-component nature of the lowest frequency optic phonon mode. Inelastic scattering spectral function and the course of the apparent phonon dispersion branches were calculated for parameters relevant to Pb(Mg1/3Nb2/3)O3 (PMN) relaxor. Dynamical parameters of the zone-centre soft mode components in the problematic region around the Burns temperature have been described with the help of the recent hyper-Raman scattering study on PMN. We show that the vertical dispersion (waterfall anomaly) is primarily due to the coupling of the transverse acoustic branch to the lower frequency component of the TO1 phonon branch. As in the inelastic neutron scattering experiments, in this model the temperature interval in which the waterfall anomaly appears is roughly restricted by the freezing and Burns temperatures.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2012

Number of the records: 1