Crystal structure and Madelung potential in R2-xCexCuO4-δ (R = Pr, Nd, Sm, Eu and Gd) system

被引：0
|
作者：
Uzumaki, Takuya [1 ]
Kamehara, Nobuo [1 ]
Niwa, Koichi [1 ]
机构：
[1] Fujitsu Lab Ltd, Atsugi, Japan
来源：
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers | 1991年 / 30卷 / 6 A期
关键词：
Ceramic Materials - Crystals--Structure - Praseodymium Compounds - X-Rays--Diffraction;
D O I：
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中图分类号：
学科分类号：
摘要：
Powder X-ray diffraction measurements were taken in the R2-xCexCuO4-δ (R = Pr, Nd, Sm, Eu and Gd) system. Rietveld refinement of these structures was performed assuming that the space group was I4/mmm. The lattice constant and rare earth metal location were determined to study the electrostatic effects of T′-phase materials. We found that the difference in the Madelung site potential, ΔV (VR-VCu), as well as Tc has a peak for the Cu-O bond length. These data suggest that the carrier concentration is not constant in T′-phase materials and that changes in the carrier concentration influence Tc in these materials.
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页码：981 / 984
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