PHASE SEGREGATION OF CERIUM IN ND2-XCEXCUO4-Y

被引：21

作者：

DREWS, AR

OSOFSKY, MS

HOFF, HA

PENG, JL

LI, ZY

GREENE, RL

VANDERAH, TA

机构：

[1] UNIV MARYLAND, CTR SUPERCOND RES, DEPT PHYS & ASTRON, COLL PK, MD 20742 USA

[2] NAWCWPNS, DEPT RES, DIV CHEM, CHINA LAKE, CA 93555 USA

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1992年 / 200卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0921-4534(92)90328-A

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report phase segregation based on cerium content in thick (> 70-mu-m) single crystals and a polycrystalline sample of Nd2-xCexCuO4-y with nominal composition x = 0.15. The crystals showed segregation into sharply defined sheets of material with different cerium concentrations. These sheets in the a-b-plane of the crystals were apparent when polished cross-sections were viewed with crossed polarizers in visible light. The different color of each layer was correlated with cerium compositions by electron microprobe analysis. AC susceptibility showed a strong, well defined transition at 24.5 K and a second, weaker transition at 20 K. The appearance of the 20 K transition was shown to be associated with a layer of material with reduced cerium content. A polycrystalline sample also displayed small intra-grain regions with reduced cerium content.

引用

页码：122 / 128

页数：7

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