Pb content and oxygen content dependences of Tc and Jc for (Bi2.1-xPbx) Sr2.0Ca0.9Y0.1Cu2.0Oy

Yasushi Idemoto, Yoshinori Matsuura, Nobuyuki Koura

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The purpose of this paper is to interpret the enhancement of Tc and Jc by the replacement of cations and the change of excess oxygen content for Bi-rich 2212 system, (B2.1-xPbx) Sr2.0 (Ca0.9Y0.1) Cu2.0Oy, especially in overdoping region. The bulk samples were prepared by coprecipitation method. In bulk samples, the c-axis and Bi+Pb valence decrease and Cu valence increases with increasing Pb content, x. Tc(zero) increases with increasing x in the single phase region. On the other hand, the c-axis and Cu valence increase and Bi+Pb valence slightly increases with increasing excess oxygen content, Δy. An optimum excess oxygen content which brought a maximum Tc(zero) was found to exist at each Pb content. Furthermore, in order to elucidate the effects of metal substitution and oxygen content on Jc of the Bi2212 system, the films with the same metal compositions were prepared by the spin coating pyrolysis method. From the results of highly orientated thin films, Jc increases with increasing excess oxygen content, Δy, in the oxygen doping region, while it increases or keeps constant in the oxygen overdoping region. According to the results, the metal composition and oxygen content are very important for obtaining the highest Tc and Jc.

Original languageEnglish
Pages (from-to)939-943
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume109
Issue number1275
DOIs
Publication statusPublished - Nov 2001

Keywords

  • Bi 2212 system
  • Bi+Pb and Cu valences
  • Critical current density
  • Critical temperature
  • High T superconducting oxide
  • Oxygen content
  • Substitution effect
  • Thin film

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