Synthesis and Structure of a New Family of Cuprate Superconductors: LnSr2Cu2GaO7

J. T. Vaughey; E. F. Hasty; D. A. Groenke; B. Dabrowski; J. P. Thiel; D. A. Groenke; Charlotte L. Stern; J. P. Thiel; K. R. Poeppelmeier; B. Dabrowski; D. G. Hinks; A. W. Mitchell; B. Dabrowski

doi:10.1021/cm00017a032

Synthesis and Structure of a New Family of Cuprate Superconductors: LnSr₂Cu₂GaO₇

J. T. Vaughey, E. F. Hasty, D. A. Groenke, B. Dabrowski, J. P. Thiel, D. A. Groenke, Charlotte L. Stern, J. P. Thiel, K. R. Poeppelmeier, B. Dabrowski, D. G. Hinks, A. W. Mitchell, B. Dabrowski

Chemistry

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Abstract

The synthesis of layered cuprates with nonmagnetic and fixed oxidation state cations separating the Cu-O planes has, until now, led to nonsuperconducting materials. A new series of layered copper oxides with the general formula LnSr₂Cu₂GaO₇(Ln = La-Yb, Y) has been synthesized. The structure has been studied by both powder neutron diffraction and single-crystal X-ray analysis. The typical unit cell is a ≈ 22.8 Å, b ≈ 5.5 Å, c ≈ 5.4 Å, in space group Ima2 (No. 46). The structure is closely related to that of YBa₂Cu₃O₇and can be described as replacement of the square-planar copper with a tetrahedral gallium. The larger lanthanides are distributed unevenly over the two A-cation sites, whereas the smaller lanthanides occupy the site between the cuprate planes. We have been able to introduce superconductivity in the Y-Sr-Cu-Ga-O system by appropriate doping with calcium and annealing.

Original language	English (US)
Pages (from-to)	935-940
Number of pages	6
Journal	Chemistry of Materials
Volume	3
Issue number	5
DOIs	https://doi.org/10.1021/cm00017a032
State	Published - Sep 1 1991

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Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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@article{b8407ac4a5d54b9b8b1e668678a4cd47,

title = "Synthesis and Structure of a New Family of Cuprate Superconductors: LnSr2Cu2GaO7",

abstract = "The synthesis of layered cuprates with nonmagnetic and fixed oxidation state cations separating the Cu-O planes has, until now, led to nonsuperconducting materials. A new series of layered copper oxides with the general formula LnSr2Cu2GaO7(Ln = La-Yb, Y) has been synthesized. The structure has been studied by both powder neutron diffraction and single-crystal X-ray analysis. The typical unit cell is a ≈ 22.8 {\AA}, b ≈ 5.5 {\AA}, c ≈ 5.4 {\AA}, in space group Ima2 (No. 46). The structure is closely related to that of YBa2Cu3O7and can be described as replacement of the square-planar copper with a tetrahedral gallium. The larger lanthanides are distributed unevenly over the two A-cation sites, whereas the smaller lanthanides occupy the site between the cuprate planes. We have been able to introduce superconductivity in the Y-Sr-Cu-Ga-O system by appropriate doping with calcium and annealing.",

author = "Vaughey, {J. T.} and Hasty, {E. F.} and Groenke, {D. A.} and B. Dabrowski and Thiel, {J. P.} and Groenke, {D. A.} and Stern, {Charlotte L.} and Thiel, {J. P.} and Poeppelmeier, {K. R.} and B. Dabrowski and Hinks, {D. G.} and Mitchell, {A. W.} and B. Dabrowski",

year = "1991",

month = sep,

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doi = "10.1021/cm00017a032",

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T1 - Synthesis and Structure of a New Family of Cuprate Superconductors

T2 - LnSr2Cu2GaO7

AU - Vaughey, J. T.

AU - Hasty, E. F.

AU - Groenke, D. A.

AU - Dabrowski, B.

AU - Thiel, J. P.

AU - Groenke, D. A.

AU - Stern, Charlotte L.

AU - Thiel, J. P.

AU - Poeppelmeier, K. R.

AU - Dabrowski, B.

AU - Hinks, D. G.

AU - Mitchell, A. W.

AU - Dabrowski, B.

PY - 1991/9/1

Y1 - 1991/9/1

N2 - The synthesis of layered cuprates with nonmagnetic and fixed oxidation state cations separating the Cu-O planes has, until now, led to nonsuperconducting materials. A new series of layered copper oxides with the general formula LnSr2Cu2GaO7(Ln = La-Yb, Y) has been synthesized. The structure has been studied by both powder neutron diffraction and single-crystal X-ray analysis. The typical unit cell is a ≈ 22.8 Å, b ≈ 5.5 Å, c ≈ 5.4 Å, in space group Ima2 (No. 46). The structure is closely related to that of YBa2Cu3O7and can be described as replacement of the square-planar copper with a tetrahedral gallium. The larger lanthanides are distributed unevenly over the two A-cation sites, whereas the smaller lanthanides occupy the site between the cuprate planes. We have been able to introduce superconductivity in the Y-Sr-Cu-Ga-O system by appropriate doping with calcium and annealing.

AB - The synthesis of layered cuprates with nonmagnetic and fixed oxidation state cations separating the Cu-O planes has, until now, led to nonsuperconducting materials. A new series of layered copper oxides with the general formula LnSr2Cu2GaO7(Ln = La-Yb, Y) has been synthesized. The structure has been studied by both powder neutron diffraction and single-crystal X-ray analysis. The typical unit cell is a ≈ 22.8 Å, b ≈ 5.5 Å, c ≈ 5.4 Å, in space group Ima2 (No. 46). The structure is closely related to that of YBa2Cu3O7and can be described as replacement of the square-planar copper with a tetrahedral gallium. The larger lanthanides are distributed unevenly over the two A-cation sites, whereas the smaller lanthanides occupy the site between the cuprate planes. We have been able to introduce superconductivity in the Y-Sr-Cu-Ga-O system by appropriate doping with calcium and annealing.

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Synthesis and Structure of a New Family of Cuprate Superconductors: LnSr₂Cu₂GaO₇

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