Stoichiometry and superconductivity in single layer Bi2+xSr2-yCuO6+-δ

R. M. Fleming, S. A. Sunshine, L. F. Schneemeyer, R. B. Van Dover, R. J. Cava, P. M. Marsh, J. V. Waszczak, S. H. Glarum, S. M. Zahurak, F. J. DiSalvo

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An insulating polymorph with a composition close to Bi2Sr2CuO6 complicates the synthesis of the single copper layer superconductor Bi2+xSr2-yCuO6±δ. We concentrate on the region where the material is single phase in air synthesis (2.18 < x < 2.29, 1.44 < y < 1.7). The physical properties from insulating to marginally conducting as the composition moves toward x = y = 0. Like to two-layer compound, the material has a superlattice due to a buckling of the planar structure, however the superlattice coherence is degraded by defects at finite values of x and y. Density measurements indicate that the nonstoichiometry of Bi2+xSr2-y CuO6±δ is not accompanied by the formation of a large number of vacancies. The insulating polymorph, Bi2Sr2CuO6, can be suppressed by synthesis in modest oxygen pressures (above 5-10 atm). The result is a bulk superconductor (Tc ≈ 10 K).

Original languageEnglish
Pages (from-to)37-50
Number of pages14
JournalPhysica C: Superconductivity and its applications
Issue number1-2
StatePublished - 15 Jan 1991


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