Superconductivity in Pb-based 1212 cuprates; evidence for under-doping from thermoelectric power

R. S. Liu, S. D. Obertelli, S. F. Hu, P. P. Edwards, D. A. Jefferson

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Abstract

We have synthesized three superconducting compounds based on the Pb-1212 phase, namely (Pb0.75Cu0.25)Sr2(Ca0.5Y0.5) Cu2O7-δ, (In0.2Pb0.55Cu0.25)Sr2(Ca0.5Y0.5)Cu2O7-δ and (Pb0.75Cu0.25)Sr2(Ca0.5Yb0.5)Cu2O7-δ, having Tc's of 40 K, 55 K and 60 K, respectively. From thermoelectric power measurements we conclude that these Pb-1212 based materials are located in the "underdoped" region compared to YBa2Cu3O7-δ. Our proposal is that still higher Tc's may be possible if one can successfully introduce even greater concentrations of holes into the conducting CuO2 plane.

Original languageEnglish
Pages (from-to)31-34
Number of pages4
JournalSolid State Communications
Volume87
Issue number1
DOIs
Publication statusPublished - 1993 Jul

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ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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