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, Shu-Fen Hu, D. A. Jefferson, B. Raveau, C. Michel, M. Hervieu, P. P. Edwards

Research output: Contribution to journalArticle

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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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Electron diffraction
Substitution reactions
electron diffraction
substitutes
halites
augmentation
Superconductivity
cuprates
Superconducting materials
Superconducting transition temperature
x rays
superconductivity
Salts
Lead
transition temperature
Rocks
Doping (additives)
X ray diffraction
Chemical analysis
diffraction

ASJC Scopus subject areas

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

Cite this

An enhancement of Tc, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr2(Ca, Y)Cu2O7-δ. / Liu, R. S.; Groult, D.; Maignan, A.; Hu, Shu-Fen; Jefferson, D. A.; Raveau, B.; Michel, C.; Hervieu, M.; Edwards, P. P.

In: Physica C: Superconductivity and its applications, Vol. 195, No. 1-2, 20.05.1992, p. 35-40.

Research output: Contribution to journalArticle

Liu, RS, Groult, D, Maignan, A, Hu, S-F, Jefferson, DA, Raveau, B, Michel, C, Hervieu, M & Edwards, PP 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, vol. 195, no. 1-2, pp. 35-40. https://doi.org/10.1016/0921-4534(92)90070-S
Liu, R. S. ; Groult, D. ; Maignan, A. ; Hu, Shu-Fen ; Jefferson, D. A. ; Raveau, B. ; Michel, C. ; Hervieu, M. ; Edwards, P. P. / An enhancement of Tc, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr2(Ca, Y)Cu2O7-δ. In: Physica C: Superconductivity and its applications. 1992 ; Vol. 195, No. 1-2. pp. 35-40.
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AU - Hu, Shu-Fen

AU - Jefferson, D. A.

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AU - Michel, C.

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AU - Edwards, P. P.

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