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A possible scenario for two soft branches in PMN
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SYSNO ASEP 0365357 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název A possible scenario for two soft branches in PMN Tvůrce(i) Kempa, Martin (FZU-D) RID, ORCID
Hlinka, Jiří (FZU-D) RID, ORCIDZdroj.dok. Phase Transitions. - : Taylor & Francis - ISSN 0141-1594
Roč. 84, 9-10 (2011), s. 784-788Poč.str. 5 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova PMN relaxor ; waterfall phenomenon ; phonon dispersions ; inelastic scattering Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GAP204/10/0616 GA ČR - Grantová agentura ČR CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000299704600008 DOI 10.1080/01411594.2011.558278 Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2012
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