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

doi:10.1016/0921-4534(91)90791-V

Stoichiometry and superconductivity in single layer Bi_2+xSr_2-yCuO_6+-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

Chemistry and Biochemistry

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Abstract

An insulating polymorph with a composition close to Bi₂Sr₂CuO₆ complicates the synthesis of the single copper layer superconductor Bi_2+xSr_2-yCuO_6±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 Bi_2+xSr_2-y CuO_6±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 (T_c ≈ 10 K).

Original language	English
Pages (from-to)	37-50
Number of pages	14
Journal	Physica C: Superconductivity and its applications
Volume	173
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(91)90791-V
State	Published - 15 Jan 1991

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title = "Stoichiometry and superconductivity in single layer Bi2+xSr2-yCuO6+-δ",

abstract = "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).",

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

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doi = "10.1016/0921-4534(91)90791-V",

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T1 - Stoichiometry and superconductivity in single layer Bi2+xSr2-yCuO6+-δ

AU - Fleming, R. M.

AU - Sunshine, S. A.

AU - Schneemeyer, L. F.

AU - Van Dover, R. B.

AU - Cava, R. J.

AU - Marsh, P. M.

AU - Waszczak, J. V.

AU - Glarum, S. H.

AU - Zahurak, S. M.

AU - DiSalvo, F. J.

PY - 1991/1/15

Y1 - 1991/1/15

N2 - 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).

AB - 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).

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ER -

Stoichiometry and superconductivity in single layer Bi_2+xSr_2-yCuO_6+-δ

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