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Phase segregation of cerium in Nd2−xCexCuO4−y

✍ Scribed by A.R. Drews; M.S. Osofsky; H.A. Hoff; J.L. Peng; Z.Y. Li; R.L. Greene; T.A. Vanderah

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
556 KB
Volume
200
Category
Article
ISSN
0921-4534

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✦ Synopsis

We report phase segregation based on cerium content in thick (> 70 ~tm) 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.

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