An enhancement of Tc, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr2(Ca, Y)Cu2O7-δ

R. S. Liu, D. Groult, A. Maignan, S. F. Hu, D. A. Jefferson, B. Raveau, C. Michel, M. Hervieu, P. P. Edwards

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Abstract

An enhancement in the superconducting transition temperature, Tc, from 45 K to 70 K, has been discovered during the course of our investigation of Cd-doping of the Pb-based 1212 superconductors. Specifically, we have attempted to synthesize a material with nominal composition (Pb0.5Cd0.5)Sr2(Ca0.5Y0.5)Cu2O7-δ, derived from the lead cuprate superconductor (Pb0.7Cu0.3)Sr2(Ca0.5Y0.5)Cu2O7-δ. From X-ray and electron diffraction, coupled with energy-dispersive X-ray emission spectrometry, we can identify the phase responsible for the 70 K superconductivity to be (Pb0.67(2)Cd0.33(5))Sr2.1(1)(Cd0.20(3)Ca0.33(3)Y0.48(4))Cu2O7-δ. Thus, we propose substitution of Cd both for Cu, in the rock salt-type (Pb, Cu)O layers, and Ca, in the Ca0.5Y0.5 lattice sites. No superlattice spots or streaks were observed in the electron diffraction experiments along the a*, b* and c* directions in the Cd-substituted material.

Original languageEnglish
Pages (from-to)35-40
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume195
Issue number1-2
DOIs
Publication statusPublished - 1992 May 20

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ASJC Scopus subject areas

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

Cite this

Liu, R. S., Groult, D., Maignan, A., Hu, S. F., Jefferson, D. A., Raveau, B., Michel, C., Hervieu, M., & Edwards, P. P. (1992). An enhancement of Tc, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr2(Ca, Y)Cu2O7-δ. Physica C: Superconductivity and its applications, 195(1-2), 35-40. https://doi.org/10.1016/0921-4534(92)90070-S