Re-examination of the second-order structural phase transition in La2-xAxCuO4 (A = Ba,Sr)

被引：10

作者：

Bozin, ES ^{[1
]}

Billinge, SJL

Kwei, GH

机构：

[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[2] Michigan State Univ, Ctr Fundamental Mat Res, E Lansing, MI 48824 USA

[3] Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

PHYSICA B | 1997年 / 241卷

关键词：

local structure; pair distribution function analysis; structural phase transition; high temperature superconductors;

D O I：

10.1016/S0921-4526(97)00720-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In the high temperature tetragonal phase of La1.85Ba0.15CuO4 (LBCO) and La1.875Sr0.125CuO4 (LSCO), the average octahedral tilts disappear at high temperature. However, we show that, locally, tilts remain at temperatures well above the orthorhombic to tetragonal phase transition. We have used full profile refinement of the real-space atomic pair distribution function (PDF) obtained from pulsed neutron powder diffraction measurements. Our modeling indicates that order-disorder models of the octahedral tilts give significantly better agreement with the data than displacive models. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：795 / 797

页数：3

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