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

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

Research output: Contribution to journalArticle

29 Citations (Scopus)

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 (z2-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.

Original languageEnglish
Pages (from-to)235-242
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Volume160
Issue number3-4
DOIs
Publication statusPublished - Sep 15 1989
Externally publishedYes

Fingerprint

hypoxia
slabs
Oxygen
Atoms
Oxides
Rietveld analysis
Neutron powder diffraction
Superconductivity
atoms
Superconducting materials
Lattice constants
oxides
Cations
Solid solutions
Positive ions
Ions
solid solutions
superconductivity
cations
neutrons

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Oxygen deficiency and atomic displacements in superconducting (Ba1-xNdx)2(Nd1-yCey)2Cu3O8+z . / Izumi, F.; Kito, H.; Sawa, H.; Akimitsu, Jun; Asano, H.

In: Physica C: Superconductivity and its Applications, Vol. 160, No. 3-4, 15.09.1989, p. 235-242.

Research output: Contribution to journalArticle

@article{bc044b5685434b60845330e6c718ab0c,
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 (z2-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 Jun Akimitsu and H. Asano",
year = "1989",
month = "9",
day = "15",
doi = "10.1016/0921-4534(89)90055-5",
language = "English",
volume = "160",
pages = "235--242",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "3-4",

}

TY - JOUR

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, Jun

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 (z2-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 (z2-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.

UR - http://www.scopus.com/inward/record.url?scp=0024733212&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024733212&partnerID=8YFLogxK

U2 - 10.1016/0921-4534(89)90055-5

DO - 10.1016/0921-4534(89)90055-5

M3 - Article

AN - SCOPUS:0024733212

VL - 160

SP - 235

EP - 242

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 3-4

ER -