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.

引用

页码：1 / 4

页数：4

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