Abstract

A systematic study of the phase stability of La(Pr) 2− x − y R x Sr(Ba, Ca) y CuO 4 (R = rare earth) compounds reveals a broad composition range for T*-phase formation. Several members of this series of compounds show bulk superconducting transition temperatures up to T c ∼ 20 K. These superconducting cuprates raise further questions about the relationship between structural stability and high temperature superconductivity in oxides.

Highlights

  • A systematicstudy of the phase stability of La(Pr)2_x_yRxSr(Ba,Ca)yCuO4(R=rare earth) compoundsreveals a broad compositionrangefor T*-phaseformation.Severalmembersof this seriesof compoundsshowbulk superconductingtransition temperaturesup to T~~ 20 K

  • The rare earths Pr through Gd form the T'phase at 214 stoichiometry

  • Cerium and the rare earths beyond Gd form no phase at this stoichiometry, they can be substituted into the above phases

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Summary

Introduction

A systematicstudy of the phase stability of La(Pr)2_x_yRxSr(Ba,Ca)yCuO4(R=rare earth) compoundsreveals a broad compositionrangefor T*-phaseformation.Severalmembersof this seriesof compoundsshowbulk superconductingtransition temperaturesup to T~~ 20 K. The rare earths Pr through Gd form the T'phase at 214 stoichiometry. This structure was first suggested by Takayama-Muromachi et al [ 3 ] in a single phase T*-sample of nominal comPosition Ndl.a2Ceo.27Sro.41CuO4.they were unable to clarify the ordering of the rare earth ions in the structure or the oxygen coordination about copper.

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Conclusion

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