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

R. M. Fleming, S. A. Sunshine, Lynn 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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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).

Original languageEnglish
Pages (from-to)37-50
Number of pages14
JournalPhysica C: Superconductivity and its applications
Volume173
Issue number1-2
DOIs
StatePublished - 15 Jan 1991

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Superconductivity
Stoichiometry
stoichiometry
superconductivity
Polymorphism
Superconducting materials
synthesis
planar structures
buckling
Chemical analysis
Vacancies
Buckling
Copper
Physical properties
physical properties
Oxygen
conduction
copper
Defects
air

Cite this

Fleming, R. M., Sunshine, S. A., Schneemeyer, L., Van Dover, R. B., Cava, R. J., Marsh, P. M., ... DiSalvo, F. J. (1991). Stoichiometry and superconductivity in single layer Bi2+xSr2-yCuO6+-δ. Physica C: Superconductivity and its applications, 173(1-2), 37-50. https://doi.org/10.1016/0921-4534(91)90791-V
Fleming, R. M. ; Sunshine, S. A. ; Schneemeyer, Lynn ; Van Dover, R. B. ; Cava, R. J. ; Marsh, P. M. ; Waszczak, J. V. ; Glarum, S. H. ; Zahurak, S. M. ; DiSalvo, F. J. / Stoichiometry and superconductivity in single layer Bi2+xSr2-yCuO6+-δ. In: Physica C: Superconductivity and its applications. 1991 ; Vol. 173, No. 1-2. pp. 37-50.
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Fleming, RM, Sunshine, SA, Schneemeyer, L, Van Dover, RB, Cava, RJ, Marsh, PM, Waszczak, JV, Glarum, SH, Zahurak, SM & DiSalvo, FJ 1991, 'Stoichiometry and superconductivity in single layer Bi2+xSr2-yCuO6+-δ', Physica C: Superconductivity and its applications, vol. 173, no. 1-2, pp. 37-50. https://doi.org/10.1016/0921-4534(91)90791-V

Stoichiometry and superconductivity in single layer Bi2+xSr2-yCuO6+-δ. / Fleming, R. M.; Sunshine, S. A.; Schneemeyer, Lynn; Van Dover, R. B.; Cava, R. J.; Marsh, P. M.; Waszczak, J. V.; Glarum, S. H.; Zahurak, S. M.; DiSalvo, F. J.

In: Physica C: Superconductivity and its applications, Vol. 173, No. 1-2, 15.01.1991, p. 37-50.

Research output: Contribution to journalArticle

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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, Lynn

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).

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