Dependence of T c on the RE-ion size in (RE,Ca)Ba2Cu3O6

K. Nakagawa, Y. Sumino, H. Chiba, K. Kim, Takashi Noji, M. Kato, Y. Koike

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


Polycrystalline samples of RE 0.6Ca0.4Ba1.6Sr0.4Cu3O6 (RE = Nd, Gd, Dy, Y, Yb, Lu) without oxygen in the Cu(1)O chain have been prepared by the conventional solid-state reaction method. No superconductivity appears for larger RE = Nd, Gd, Dy, while superconductivity with T c ∼50 K appears for smaller RE = Y, Yb, Lu. This is presumably because holes produced by the Ca-substitution for RE are more supplied to the conductive Cu(2)O2 plane than to Cu(1) as the lattice becomes small. The maximum T c = 53 K for RE = Lu is considerably lower than 90 K for REBa2Cu3O7. This may be due to the low hole-concentration in the Cu(2)O2 plane.

Original languageEnglish
Article number012011
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2018 Jul 26
Event30th International Symposium on Superconductivity, ISS 2017 - Tokyo, Japan
Duration: 2017 Dec 132017 Dec 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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