Phonon mode softening at the ferroelectric transition in Eu0.5Ba0.5TiO3

被引：7
|
作者：
Rowan-Weetaluktuk, W. N. [1 ]
Ryan, D. H. [1 ]
Sushkov, A. O. [2 ]
Eckel, S. [2 ]
Lamoreaux, S. K. [2 ]
Sushkov, O. P. [3 ]
Cadogan, J. M. [4 ]
Yethiraj, M. [5 ]
Studer, A. J. [5 ]
机构：
[1] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
[2] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[3] Univ New S Wales, Sch Phys, Sydney, NSW 2070, Australia
[4] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada
[5] ANSTO, Bragg Inst, Menai, NSW 2234, Australia
来源：
HYPERFINE INTERACTIONS | 2010年 / 198卷 / 1-3期
关键词：
Ferroelectric; Mossbauer spectroscopy; Electron electric dipole moment;
D O I：
10.1007/s10751-010-0204-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
We have observed the effects of phonon mode softening at the ferroelectric transition in Eu0.5Ba0.5TiO3 by Eu-151 Mossbauer spectroscopy. Both Eu2+ and Eu3+ spectral components are observed in the relative area ratio of 90% : 10% and both show a decrease in subspectral area at the transition, centred at 175 K, due to phonon mode softening. Surprisingly, the temperature dependence of the f-factor shows a much stronger response in the Eu3+ component than in the Eu2+ one. Preliminary analysis of neutron powder diffraction data rules out the possibility that some of the europium might be located on titanium sites.
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页码：1 / 4
页数：4
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