Synthesis and structural analysis of the superconducting lead cuprates, (Pb, Cu) (Sr, R)2 (R′, Ce)2Cu2Oz (R, R′: rare-earth element)

Toshihiko Maeda, Kazuhiro Sakuyama, Naomichi Sakai, H. Yamauchi, Shoji Tanaka

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The structural analysis of a superconducting (Pb/Cu)-1222 phase, (Pb0.5Cu0.5)(Sr0.875Eu0.125)2(Eu0.75Ce0.25)2Cu2 Oz (z≈9), is performed by Rietveld analysis using X-ray powder diffraction data. Pb, Cu and O atoms constituting the (Pb/Cu)O monolayer in this crystal are found to be displaced from their ideal crystallographic sites as previously reported for the (Pb/Cu)-1212 compound. In addition, (Pb, Cu)-1222 compounds with nominal compositions of (Pb, Cu)(Sr, R)2(R', Ce)2Cu2Oz (R, R': rare-earth element) are synthesized and characterized. Nearly single-phase samples are successfully obtained for the compounds with R = R′ = Pr, Sm, Eu, Gd, Dy, Y or Ho, and for those with a pair of rare-earth elements, (R, R′) = (La, Eu), (Nd, Eu), (Nd, Dy), (Nd, Y), (Nd, Er), (Sm, Eu) or (Eu, Gd). Superconductivity is observed for the samples with R = R′ = Sm, Eu or Gd and also for those with (R, R′) = (La, Eu), (Nd, Eu), (Sm, Eu) or (Eu, Gd).

Original languageEnglish
Pages (from-to)337-344
Number of pages8
JournalPhysica C: Superconductivity and its applications
Volume177
Issue number4-6
DOIs
Publication statusPublished - 1991 Jul 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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