X-ray and electron diffraction study of a precipitation phase in Nd 1.85Ce0.15CuO4+y single crystal

Hiroyuki Kimura, Yukio Noda, Futami Sato, Kenji Tsuda, Kenji Kurahashi, Tetsushi Uefuji, Masaki Fujita, Kazuyoshi Yamada

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11 Citations (Scopus)

Abstract

X-ray diffraction measurements have been performed to investigate a crystal structure of a precipitation phase in oxygen-reduced Nd1.85Ce 0.15CuO4+y (NCCO). A detailed structure analysis of the precipitation phase as well as the parent NCCO phase revealed that the precipitation phase is a cubic (Nd,Ce)2O3, which is distorted tetragonally by the surrounding NCCO phase. The averaged grain size of the precipitation phase exceeds 200 Å parallel to the CuO2 plane of the parent NCCO, while the size along layered direction is short-ranged (∼30 Å). The grain thickness along layered direction is strongly correlated with the homogeneity of superconducting state. The volume fraction of the (Nd,Ce)2O3 phase is about 2%. We also performed electron diffraction as well as microscopy experiment, which confirms that the (Nd,Ce)2O3 phase segregate from the parent NCCO phase and exists as an epitaxial layer along the c-axis.

Original languageEnglish
Pages (from-to)2282-2286
Number of pages5
Journaljournal of the physical society of japan
Volume74
Issue number8
DOIs
Publication statusPublished - 2005 Aug

Keywords

  • Electron diffraction and microscopy
  • High-T superconductivity
  • Precipitation
  • X-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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