Superconductivity in the Bi2Sr3-xLnxCu2Oy system and the excess of hole concentration in Bi2Sr2CanCu1+nOy (n=0 and 1)

Tohru Den, Jun Akimitsu

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30 Citations (Scopus)

Abstract

A new family of high-Tc superconductors of Bi2Sr3-xLnxCu2Oy(Ln=Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Y) has been found by means of resistivity and magnetization measurements. The highest superconducting transition temperature was obtained when the substitution concentration x was about 0.3. The X-ray powder diffraction measurement showed that Bi2Sr2-xLnxCuOy (221 phase) is stable for x<0.3 and Bi2Sr3-xLnxCu2Oy (232 phase) becomes major when x exceeds 0.3. The 232 phase has the same structure as Bi2Sr2CaCu2Oy. It is also demonstrated that the hole number p of [Cu-O]+p in Bi2Sr2CuOy and Bi2Sr2CaCu2Oy is excessive compared with the proper value giving the highest Tc.

Original languageEnglish
Pages (from-to)L193-L196
JournalJapanese Journal of Applied Physics
Volume28
Issue number2 A
DOIs
Publication statusPublished - Feb 1989
Externally publishedYes

Keywords

  • Bi-Sr-Ln-Cu-O system
  • Oxide superconductor

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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