Neutron scattering study of the antiferroelectric transition in TlD2PO4

被引：6

作者：

Rios, S ^{[1
]}

Quilichini, M

Perez-Mato, JM

机构：

[1] CEA Saclay, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France

[2] Univ Basque Country, Fac Ciencias, Dept Fis Mat Condensada, Bilbao 48080, Spain

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1998年 / 10卷 / 13期

关键词：

D O I：

10.1088/0953-8984/10/13/021

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The mechanism of the para-antiferroelectric phase transition at 353 K in TlD2PO4 has been investigated by coherent elastic and inelastic neutron scattering. The structural phase transition is shown to arise from the condensation of a diffusive mode to which a low-frequency zone boundary (at the S point (1/2, 1/2, 0)) S-1(+) soft mode is coupled. The existence in TlD2PO4 of a weakly dispersive low-frequency optic branch along the [xi, xi, 0] direction, which may be attributed to PO4 rigid-body librations, may be regarded as an explanation of the appearance in the homologue TlD2PO4 of a pseudo-proper ferroelastic transition, already characterized by previous structural studies.

引用

页码：3045 / 3060

页数：16

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