Normal and superconducting properties of Pb2Sr2Y1-xCaxCu3O8+δ. II. Dependence on the oxygen concentration

Yoji Koike, Hiromu Sunagawa, Takashi Noji, Masahiro Masuzawa, Norio Kobayashi, Michiko Namiki, Kichinosuke Hirokawa, Yoshitami Saito

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28 Citations (Scopus)

Abstract

The dependence on the oxygen concentration of normal and superconducting properties of ceramic samples of Pb2Sr2Y1-xCaxCu3O8+δ has been investigated in the composition range of 0≤x≤0.5 and 0≤δ<2. The superconductivity in each sample with different x is suppressed with increasing δ, which is in good correspondence to the increase in resistivity and Hall coefficient with increasing δ, but is contradictory to the speculation by Ohta and Maekawa [Phys. Rev. B41 (1990) 6524]. It is found from chemical analysis that holes introduced by the extra oxygen first enter the CuOδ layer and then the PbO layer rather than the pyramidal CuO2 layer. With increasing δ, a structural phase transition from the orthorhombic phase to the tetragonal phase is observed at δ∼1 in every sample with different x. The dependence on the oxygen concentration of the magnetic susceptibility is also reported.

Original languageEnglish
Pages (from-to)331-338
Number of pages8
JournalPhysica C: Superconductivity and its applications
Volume171
Issue number3-4
DOIs
Publication statusPublished - 1990 Nov 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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