Static disorder in the incommensurate structure of the high T-c superconductor Bi(2)Sr(2)CaCu(2)O8+delta

被引：38

作者：

Grebille, D ^{[1
]}

Leligny, H ^{[1
]}

Ruyter, A ^{[1
]}

Labbe, P ^{[1
]}

Raveau, B ^{[1
]}

机构：

[1] UNIV TOURS,LAB LETO,F-37000 TOURS,FRANCE

来源：

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE | 1996年 / 52卷

关键词：

D O I：

10.1107/S0108768196004673

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The incommensurate modulated structure of the high T-c superconductor of nominal composition Bi2Sr2CaCu2O8 has been refined using an optimized data set of 1530 reflections (496 main reflections, 753 first-order and 281 second-order satellites) in superspace group Bbmb(0 beta 1) using a Fourier expansion of the modulation functions up to second order. A large improvement of the R (wR) factor [global: 0.056 (0.051); main reflections: 0.049 (0.043); first-order satellites: 0.056 (0.058); second-order satellites: 0.078 (0.079)] is obtained by the introduction of a static modulated disorder on the Bi site without any thermal factor modulation and by considering occupational modulation functions. A detailed comparison with previous studies in modulated structure models or in supercell models is given, in particular for the description of the BiO layers.

引用

页码：628 / 642

页数：15

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