STOICHIOMETRY AND SUPERCONDUCTIVITY IN SINGLE LAYER BI2+XSR2-YCUO6+/-DELTA

被引：59

作者：

FLEMING, RM ^{[1
]}

SUNSHINE, SA ^{[1
]}

SCHNEEMEYER, LF ^{[1
]}

VANDOVER, RB ^{[1
]}

CAVA, RJ ^{[1
]}

MARSH, PM ^{[1
]}

WASZCZAK, JV ^{[1
]}

GLARUM, SH ^{[1
]}

ZAHURAK, SM ^{[1
]}

DISALVO, FJ ^{[1
]}

机构：

[1] CORNELL UNIV,DEPT CHEM,ITHACA,NY 14853

来源：

PHYSICA C | 1991年 / 173卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(91)90791-V

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An insulating polymorph with a composition close to Bi2Sr2CuO6 complicates the synthesis of the single copper layer superconductor Bi(2+x)Sr(2-y)CuO6+/-delta. 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 a 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+x)Sr(2-y)CuO6+/-delta 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) almost-equal-to 10 K).

引用

页码：37 / 50

页数：14

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