TETRAGONAL-ORTHORHOMBIC STRUCTURAL MODULATION AT LOW-TEMPERATURE IN LA2-XBAXCUO4

被引：50

作者：

ZHU, YM

MOODENBAUGH, AR

CAI, ZX

TAFTO, J

SUENAGA, M

WELCH, DO

机构：

[1] Materials Science Division, Brookhaven National Laboratory, Upton

[2] University of Oslo, Department of Physics, Blindern

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.73.3026

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Below ∼60 K La2-xBaxCuO4(0.10≤x≤0.15) reveals superstructure reflections consistent with the tetragonal space group P42ncm [low temperature tetragonal (LTT)]. However, twins, characteristic of the related orthorhombic phase [low temperature orthorhombic (LTO)], persist in this material. Electron microscopy shows that the LTT superstructure reflections originate from the twin-boundary region. This suggests a phase mixture of orthorhombic and tetragonal with a gradual change from LTO (space group Bmab) in the interior of the twin domains, via the Pccn, to LTT at the twin boundary. This is modeled as a spatial modulation, the tipping angle of CuO6 octahedra being an order parameter. © 1994 The American Physical Society.

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页码：3026 / 3029

页数：4

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