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Journal of Superconductivity and Novel Magnetism

, Volume 25, Issue 2, pp 305–309 | Cite as

Synthesis of New Pb-Based 1222 Cuprates Containing Phosphorus, (Pb0.75P0.25)Sr2(RE2–xy Ce x Sr y )Cu2O z (RE = Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Y)

  • Hiroyuki Sasakura
  • Yoshiya Akagi
  • Masashi Tanaka
  • Shigeki Tsukui
  • Motoaki Adachi
Original Paper

Abstract

New Pb-based 1222 cuprates containing phosphorus have been synthesized in the (Pb0.75P0.25)Sr2- (RE2–xy Ce x Sr y )Cu2O z (RE = Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Y) systems. The almost-single phase samples are obtained for 0.5≤x≤1.0 and y=0.1 in the cases of RE = Nd, Dy, Ho, Er, Tm, Yb and Y, while for 0.3≤x≤1.0 and y=0.1 in the cases of RE = Sm, Eu and Gd. The samples crystallize in a tetragonal lattice, the lattice parameters a and c are decreasing with the decrease of the ionic radius of the RE element. Even after annealing under 143 atm O2 atmosphere at 400 °C, almost all the samples with the common values x=0.5 and y=0.1 are semiconductors with a transport process followed by three-dimensional variable range hopping. However, the samples of RE = Sm, Eu and Gd, which are of almost single 1222 phase, even for x=0.3 and y=0.1, show superconductivity with the onsets at about 25 K, 20 K and 22 K, respectively. Through this study, we find very important procedure for discovery of new superconducting 1222 compound.

Keywords

New Pb-based layered cuprate 1222 phase (Pb0.75P0.25)Sr2(RE2–xy Cex SryCu2Oz Superconductivity 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Hiroyuki Sasakura
    • 1
  • Yoshiya Akagi
    • 1
  • Masashi Tanaka
    • 2
    • 4
  • Shigeki Tsukui
    • 3
  • Motoaki Adachi
    • 3
  1. 1.Department of PhysicsHamamatsu University School of MedicineHamamatsuJapan
  2. 2.Department of PhysicsShizuoka UniversitySuruga-kuJapan
  3. 3.Department of Chemical EngineeringGraduate School of Engineering, Osaka Prefecture UniversitySakaiJapan
  4. 4.Department of Applied ChemistryGraduate School of Engineering, Hiroshima UniversityHiroshimaJapan

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