Tetragonal to orthorhombic phase transition of GdFeAsO studied by single-crystal X-ray diffraction

被引：9

作者：

Nitsche, F. ^{[1
]}

Doert, Th. ^{[1
]}

Ruck, M. ^{[1
,2
]}

机构：

[1] Tech Univ Dresden, Dept Chem & Food Chem, D-01062 Dresden, Germany

[2] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

来源：

SOLID STATE SCIENCES | 2013年 / 19卷

关键词：

Iron pnictide superconductors; Synchrotron X-ray diffraction; Single crystal; Phase transition; Twinning; LAYERED SUPERCONDUCTOR;

D O I：

10.1016/j.solidstatesciences.2013.02.022

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A single-crystal diffraction study of the tetragonal to orthorhombic phase transition of GdFeAsO is presented. By cooling below the structural transition temperature splitting of the Bragg reflections was observed corresponding to the formation of four different twin domain orientations. A model was developed to quantify the distortion of the lattice from the position of the split reflections relative to each other. Constrained 2D-Cauchy fits of several split reflections provided the positions of the reflections. The influence of the structural distortion can already be surmised by structural fluctuations in the tetragonal phase before a peak splitting is actually observed. (C) 2013 Elsevier Masson SAS. All rights reserved.

引用

页码：162 / 166

页数：5

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