Magnetic-field irreversibility in superconductive Cu-m212 (m = 1, 2)

Takayuki Nakane, Maarit Karppinen, Hisao Yamauchi*

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Citations (Scopus)


The magnetic-field irreversibility (Hirr) characteristics of the CuBa2YCu2O7-δ (Cu-1212 or so-called "123") and Cu2Ba2YCu2O8-δ (Cu-2212 or so-called "124") phases are studied with respect to the hole-doping level and the isovalent-substitution effect. For both the phases the Hirr characteristics are enhanced with increasing overall hole-doping level. When comparing fully oxygenated samples, the Hirr line of the Cu-2212 phase is located at magnetic fields lower than that of the Cu-1212 phase. The Sr(II)-for-Ba(II) substitution is not effective in enhancing the Hirr characteristics of the Cu-m212 phases. It rather lowers the Hirr line in the case of the Cu-1212 phase. On the other hand, the Yb(III)-for-Y(III) substitution enhances the Hirr characteristics of the Cu-1212 phase. Both types of isovalent substitution, i.e. Sr-for-Ba and Yb-for-Y, result in contraction of the lattice dimensions, but work oppositely in terms of the effect on the Hirr characteristics. Therefore it is considered that the control over the Hirr characteristics is not simply achieved by the lattice-dimension change but rather by the change in the homogeneity of the hole-density distribution over the crystal.

Original languageEnglish
Article number11266
Pages (from-to)226-229
Number of pages4
Publication statusPublished - 1 Jan 2001
MoE publication typeA1 Journal article-refereed
EventInternational Symposium on Superconductivity - Tokyo, Japan
Duration: 14 Oct 200015 Oct 2000
Conference number: 13


  • Isovalent substitution
  • Magnetic-field irreversibility
  • Overall hole-doping level

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