The incommensurate modulated structure of Sr14-xCaxCu24O41 as a function of temperature and composition

被引：2
|
作者：
Bougerol-Chaillout, C [1 ]
Bordet, P [1 ]
Bérar, JF [1 ]
Darie, C [1 ]
Pachot, S [1 ]
机构：
[1] CNRS, Cristallog Lab, F-38042 Grenoble 9, France
来源：
PHYSICA C | 2000年 / 341卷
关键词：
D O I：
10.1016/S0921-4534(00)00552-9
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
From synchrotron x-ray powder data collected on the BM16 beam line at ESRF, we have determined the incommensurate modulated structure of Sr14-xCaxCu24O41 (x=6, 13.6) from 10K to 300K, using the XND software. No major structural change occurs as a function of temperature. The comparison of the atomic positions and Cu-O interatomic distances between the two compounds indicates a charge transfer from the chain to the ladder sublattice as the Ca content increases. Furthermore, whereas the charges appear localized in both sublattices for the x=6 compound, those on the ladder sublattice of the x=13.6 metallic compound are delocalized. This behavior has been correlated with the degree of disorder induced by the substitution in the adjacent Sr/Ca layer.
引用
收藏
页码：479 / 480
页数：2
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