Oxygen deficiency and atomic displacements in superconducting (Ba1-xNdx)2(Nd1-yCey)2Cu3O8+z

F. Izumi; H. Kito; H. Sawa; J. Akimitsu; H. Asano

doi:10.1016/0921-4534(89)90055-5

Oxygen deficiency and atomic displacements in superconducting (Ba_1-xNd_x)₂(Nd_1-yCe_y)₂Cu₃O_8+z

F. Izumi, H. Kito, H. Sawa, J. Akimitsu, H. Asano

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

The structural parameters of the superconductor (Ba_0.633Nd_0.367)₂(Nd_0.675Ce_0.325)₂Cu₃O_8+z (z≈0.91) were refined by the Rietveld analysis of TOF neutron powder diffraction data. This oxide belongs to a new family of solid solutions (Ba_1-xLn_x)₂(Ln_1-yCe_y)₂Cu₃O_8+z (Ln=Nd, Sm, Eu and Gd). It has a body-centered tetragonal structure with space group I4/mmm and lattice constants a=0.38747(4) nm and c=2.8599(3) nm. Its structure can be derived by stacking tetragonal Ba₂YCu₃O_6+z-and Nd₂CuO₄-type slabs alternately along the c-axis; they are jointed through two-dimensional hole-doped CuO₂ sheets. Each Cu cation on the CuO₂ sheet is coordinated to five oxide ions in a distorted square-pyramidal configuration. The Ba₂YCu₃O_6+z-type slab accommodates Ba(Nd) atoms, whereas each Nd(Ce) atom in the Nd₂CuO₄-type slab has four short and four long Nd(Ce)-O bonds. Cu and O atoms within the Ba₂YCu₃O_6+z-type slab are considerably displaced from ideal positions. An O site between two Ba(Nd)O sheets is highly deficient (occupancy: 0.114), as is observed in corresponding oxygen sites in the tetragonal structures of Ba₂YCu₃O_6+z (z<0.5) and Ba_2-xLn_1+xCu₃O_7±z (Ln=La, Pr, Nd, Sm and Eu). Bulk superconductivity is induced by intercalating a sufficient amount of O at this position to increase the concentration of (Cu-O)⁺ holes on the CuO₂ sheet.

Original language	English
Pages (from-to)	235-242
Number of pages	8
Journal	Physica C: Superconductivity and its applications
Volume	160
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(89)90055-5
Publication status	Published - Sept 15 1989
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(89)90055-5

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title = "Oxygen deficiency and atomic displacements in superconducting (Ba1-xNdx)2(Nd1-yCey)2Cu3O8+z",

abstract = "The structural parameters of the superconductor (Ba0.633Nd0.367)2(Nd0.675Ce0.325)2Cu3O8+z (z≈0.91) were refined by the Rietveld analysis of TOF neutron powder diffraction data. This oxide belongs to a new family of solid solutions (Ba1-xLnx)2(Ln1-yCey)2Cu3O8+z (Ln=Nd, Sm, Eu and Gd). It has a body-centered tetragonal structure with space group I4/mmm and lattice constants a=0.38747(4) nm and c=2.8599(3) nm. Its structure can be derived by stacking tetragonal Ba2YCu3O6+z-and Nd2CuO4-type slabs alternately along the c-axis; they are jointed through two-dimensional hole-doped CuO2 sheets. Each Cu cation on the CuO2 sheet is coordinated to five oxide ions in a distorted square-pyramidal configuration. The Ba2YCu3O6+z-type slab accommodates Ba(Nd) atoms, whereas each Nd(Ce) atom in the Nd2CuO4-type slab has four short and four long Nd(Ce)-O bonds. Cu and O atoms within the Ba2YCu3O6+z-type slab are considerably displaced from ideal positions. An O site between two Ba(Nd)O sheets is highly deficient (occupancy: 0.114), as is observed in corresponding oxygen sites in the tetragonal structures of Ba2YCu3O6+z (z<0.5) and Ba2-xLn1+xCu3O7±z (Ln=La, Pr, Nd, Sm and Eu). Bulk superconductivity is induced by intercalating a sufficient amount of O at this position to increase the concentration of (Cu-O)+ holes on the CuO2 sheet.",

author = "F. Izumi and H. Kito and H. Sawa and J. Akimitsu and H. Asano",

year = "1989",

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T1 - Oxygen deficiency and atomic displacements in superconducting (Ba1-xNdx)2(Nd1-yCey)2Cu3O8+z

AU - Izumi, F.

AU - Kito, H.

AU - Sawa, H.

AU - Akimitsu, J.

AU - Asano, H.

PY - 1989/9/15

Y1 - 1989/9/15

N2 - The structural parameters of the superconductor (Ba0.633Nd0.367)2(Nd0.675Ce0.325)2Cu3O8+z (z≈0.91) were refined by the Rietveld analysis of TOF neutron powder diffraction data. This oxide belongs to a new family of solid solutions (Ba1-xLnx)2(Ln1-yCey)2Cu3O8+z (Ln=Nd, Sm, Eu and Gd). It has a body-centered tetragonal structure with space group I4/mmm and lattice constants a=0.38747(4) nm and c=2.8599(3) nm. Its structure can be derived by stacking tetragonal Ba2YCu3O6+z-and Nd2CuO4-type slabs alternately along the c-axis; they are jointed through two-dimensional hole-doped CuO2 sheets. Each Cu cation on the CuO2 sheet is coordinated to five oxide ions in a distorted square-pyramidal configuration. The Ba2YCu3O6+z-type slab accommodates Ba(Nd) atoms, whereas each Nd(Ce) atom in the Nd2CuO4-type slab has four short and four long Nd(Ce)-O bonds. Cu and O atoms within the Ba2YCu3O6+z-type slab are considerably displaced from ideal positions. An O site between two Ba(Nd)O sheets is highly deficient (occupancy: 0.114), as is observed in corresponding oxygen sites in the tetragonal structures of Ba2YCu3O6+z (z<0.5) and Ba2-xLn1+xCu3O7±z (Ln=La, Pr, Nd, Sm and Eu). Bulk superconductivity is induced by intercalating a sufficient amount of O at this position to increase the concentration of (Cu-O)+ holes on the CuO2 sheet.

AB - The structural parameters of the superconductor (Ba0.633Nd0.367)2(Nd0.675Ce0.325)2Cu3O8+z (z≈0.91) were refined by the Rietveld analysis of TOF neutron powder diffraction data. This oxide belongs to a new family of solid solutions (Ba1-xLnx)2(Ln1-yCey)2Cu3O8+z (Ln=Nd, Sm, Eu and Gd). It has a body-centered tetragonal structure with space group I4/mmm and lattice constants a=0.38747(4) nm and c=2.8599(3) nm. Its structure can be derived by stacking tetragonal Ba2YCu3O6+z-and Nd2CuO4-type slabs alternately along the c-axis; they are jointed through two-dimensional hole-doped CuO2 sheets. Each Cu cation on the CuO2 sheet is coordinated to five oxide ions in a distorted square-pyramidal configuration. The Ba2YCu3O6+z-type slab accommodates Ba(Nd) atoms, whereas each Nd(Ce) atom in the Nd2CuO4-type slab has four short and four long Nd(Ce)-O bonds. Cu and O atoms within the Ba2YCu3O6+z-type slab are considerably displaced from ideal positions. An O site between two Ba(Nd)O sheets is highly deficient (occupancy: 0.114), as is observed in corresponding oxygen sites in the tetragonal structures of Ba2YCu3O6+z (z<0.5) and Ba2-xLn1+xCu3O7±z (Ln=La, Pr, Nd, Sm and Eu). Bulk superconductivity is induced by intercalating a sufficient amount of O at this position to increase the concentration of (Cu-O)+ holes on the CuO2 sheet.

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Oxygen deficiency and atomic displacements in superconducting (Ba_1-xNd_x)₂(Nd_1-yCe_y)₂Cu₃O_8+z

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