High temperature electrical properties and defect chemistry of La2-xCaxCuO4-y superconductors - II. Defect structure modeling

Li Shen; Paul Salvador; Thomas O. Mason; Kazuo Fueki

doi:10.1016/S0022-3697(95)00324-X

High temperature electrical properties and defect chemistry of La_2-xCa_xCuO_4-y superconductors - II. Defect structure modeling

Li Shen^*, Paul Salvador, Thomas O. Mason, Kazuo Fueki

^*Corresponding author for this work

Materials Science and Engineering

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

13 Scopus citations

Abstract

The defect structure of La_2-xCa_xCuO_4-y superconductors was examined by fitting electrical property and oxygen nonstoichiometry data to a variety of models. Those involving charged oxygen vacancies, whether isolated or associated, were inadequate for simultaneously describing the dependence of both properties on doping level and oxygen partial pressure. Neutral oxygen vacancies and their association with dopants were invoked, resulting in a successful reconciliation of all existing experimental data. The defect types and configurations can be rationalized in terms of the bond-mismatch between the (LaO)₂ and CuO₂ layers in the La₂CuO₄ structure. The defect associates proposed may be responsible for the suppression in T_c relative to the La_2-xBa_xCuO_4-y and La_2-xSr_xCuO_4-y systems.

Original language	English (US)
Pages (from-to)	1977-1987
Number of pages	11
Journal	Journal of Physics and Chemistry of Solids
Volume	57
Issue number	12
DOIs	https://doi.org/10.1016/S0022-3697(95)00324-X
State	Published - Dec 1996

Keywords

A. superconductors
D. defects
D. electrical properties

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/S0022-3697(95)00324-X

Cite this

@article{ce654de5315745728eb1c110618d95e3,

title = "High temperature electrical properties and defect chemistry of La2-xCaxCuO4-y superconductors - II. Defect structure modeling",

abstract = "The defect structure of La2-xCaxCuO4-y superconductors was examined by fitting electrical property and oxygen nonstoichiometry data to a variety of models. Those involving charged oxygen vacancies, whether isolated or associated, were inadequate for simultaneously describing the dependence of both properties on doping level and oxygen partial pressure. Neutral oxygen vacancies and their association with dopants were invoked, resulting in a successful reconciliation of all existing experimental data. The defect types and configurations can be rationalized in terms of the bond-mismatch between the (LaO)2 and CuO2 layers in the La2CuO4 structure. The defect associates proposed may be responsible for the suppression in Tc relative to the La2-xBaxCuO4-y and La2-xSrxCuO4-y systems.",

keywords = "A. superconductors, D. defects, D. electrical properties",

author = "Li Shen and Paul Salvador and Mason, {Thomas O.} and Kazuo Fueki",

note = "Funding Information: Acknowledgements-Suppfoorrt the presenst tudyf rom the U.S. Departmento f Energy under Grant No. FGO2-84ER4509(7L S, TOM) andt heN ationalS cienceF oundation,",

year = "1996",

month = dec,

doi = "10.1016/S0022-3697(95)00324-X",

language = "English (US)",

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pages = "1977--1987",

journal = "Journal of Physics and Chemistry of Solids",

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T1 - High temperature electrical properties and defect chemistry of La2-xCaxCuO4-y superconductors - II. Defect structure modeling

AU - Shen, Li

AU - Salvador, Paul

AU - Mason, Thomas O.

AU - Fueki, Kazuo

N1 - Funding Information: Acknowledgements-Suppfoorrt the presenst tudyf rom the U.S. Departmento f Energy under Grant No. FGO2-84ER4509(7L S, TOM) andt heN ationalS cienceF oundation,

PY - 1996/12

Y1 - 1996/12

N2 - The defect structure of La2-xCaxCuO4-y superconductors was examined by fitting electrical property and oxygen nonstoichiometry data to a variety of models. Those involving charged oxygen vacancies, whether isolated or associated, were inadequate for simultaneously describing the dependence of both properties on doping level and oxygen partial pressure. Neutral oxygen vacancies and their association with dopants were invoked, resulting in a successful reconciliation of all existing experimental data. The defect types and configurations can be rationalized in terms of the bond-mismatch between the (LaO)2 and CuO2 layers in the La2CuO4 structure. The defect associates proposed may be responsible for the suppression in Tc relative to the La2-xBaxCuO4-y and La2-xSrxCuO4-y systems.

AB - The defect structure of La2-xCaxCuO4-y superconductors was examined by fitting electrical property and oxygen nonstoichiometry data to a variety of models. Those involving charged oxygen vacancies, whether isolated or associated, were inadequate for simultaneously describing the dependence of both properties on doping level and oxygen partial pressure. Neutral oxygen vacancies and their association with dopants were invoked, resulting in a successful reconciliation of all existing experimental data. The defect types and configurations can be rationalized in terms of the bond-mismatch between the (LaO)2 and CuO2 layers in the La2CuO4 structure. The defect associates proposed may be responsible for the suppression in Tc relative to the La2-xBaxCuO4-y and La2-xSrxCuO4-y systems.

KW - A. superconductors

KW - D. defects

KW - D. electrical properties

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U2 - 10.1016/S0022-3697(95)00324-X

DO - 10.1016/S0022-3697(95)00324-X

M3 - Article

AN - SCOPUS:0030410524

VL - 57

SP - 1977

EP - 1987

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

SN - 0022-3697

IS - 12

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