RAMAN-SCATTERING OF FERROELECTRIC SR1-XCAXTIO3, X=0.007

被引：114

作者：

BIANCHI, U ^{[1
]}

KLEEMANN, W ^{[1
]}

BEDNORZ, JG ^{[1
]}

机构：

[1] IBM CORP,RES LAB,CH-8803 RUSCHLIKON,SWITZERLAND

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1994年 / 6卷 / 06期

关键词：

D O I：

10.1088/0953-8984/6/6/025

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

First-order Raman Scattering of A(1g) and E(g) modes originating from the antiferrodistortive F-2u soft mode confirms the cubic-tetragonal (O-h-D-4h) phase transition in Sr0.993Ca0.007TiO3 at T-0 = 125 K. Within the cubic and the tetragonal phase first-order Raman scattering of the soft ferroelectric F-1u mode (TO1) and of the hard TO2 and TO4 optic modes evidences the existence of Ca2+-centred polar microregions. Their size increases rapidly on cooling towards the ferroelectric ordering temperature, T-c = 18 K. Splitting and incomplete softening of the F-1u components is consistent with an order-disorder transition into an orthorhombic low-temperature phase with C-2v symmetry.

引用

页码：1229 / 1238

页数：10

共 21 条

[1] RESIDUAL-STRESS IN DAMAGED SRTIO-3 SINGLE-CRYSTALS [J].