Influence of chemical substituents on the superconductivity of the system Bi4Ca3Sr3Cu4Oy

E. V. Sampathkumaran, N. Ikeda, K. Kohn, R. Vijayaraghavan

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The effect of the partial replacement of Bi by Eu, Gd, K and Pb, and Cu by Ni, on the superconducting transition temperature (Tc) of Bi 4Ca3Sr3Cu4Oy (y=undetermined) is investigated by DC resistivity (R) and AC susceptibility ( chi ) measurements. Tc is not significantly altered by Eu and Gd substituents (Tc close to 65 K); however, K and Pb substituents tend to enhance the fraction of a phase superconducting around 110 K. Interestingly, for nickel specimens, Tc of a large fraction, as suggested by AC chi data, initially decreases to 40 K with increasing concentration of nickel, followed by an increase, whereas R data shows no appreciable variation of T c.

Original languageEnglish
Article number004
Pages (from-to)L163-L167
JournalJournal of Physics F: Metal Physics
Issue number8
Publication statusPublished - Dec 1 1988
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys


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