Structure of non-phase-separated La2CuO4.03 studied by single-crystal neutron diffraction

被引：7

作者：

Sheptyakov, DV ^{[1
]}

Pomjakushin, VY

Balagurov, AM

Zakharov, AA

Chaillout-Bougerol, C

McIntyre, GJ

机构：

[1] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna 141980, Moscow Reg, Russia

[2] RSC Kurchatov Inst, Moscow 123182, Russia

[3] CNRS, Cristallog Lab, F-38042 Grenoble, France

[4] Inst Max von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

PHYSICA C | 1999年 / 321卷 / 1-2期

基金：

俄罗斯基础研究基金会;

关键词：

phase separation; La-based cuprates; neutron diffraction;

D O I：

10.1016/S0921-4534(99)00376-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The structure of a La2CuO4+y single crystal with the excess oxygen content y = 0.03 has been studied by means of neutron diffraction at T = 13 K. Although the extra oxygen content of y = 0.03 is inside the miscibility gap of La2CuO4+y (0.01 < y < 0.06), the crystal is not phase separated at low temperatures. The sole phase constituting the sample has Cmca symmetry. It was confirmed that the extra oxygen, O4, is located close to the site (1/4, 1/4, 1/4). The structural parameters for all atoms lay between those previously determined for the oxygen-poor and oxygen-rich phases representing the edges of the miscibility gap, y = 0.01 and 0.06, respectively. Our data allow us to conclude that (1) the phase-separated and non-phase-separated La2CuO4+y compounds are structurally identical, and (2) the crystal structure of La2CuO4+y changes monotonically when the extra oxygen content changes from 0 to 0.05. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：103 / 107

页数：5

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