Point defect modeling of La2CuO4-based superconductors

Li Shen, Paul A. Salvador, Thomas O Mason

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A point defect modeling study of the oxygen nonstoichiometry and high-temperature electrical properties of La2-xAExCuO4-y (AE = Ba, Sr, and Ca) systems indicates that, whereas oxygen excess (y0) results primarily from dopant-vacancy associates at large x; isolated oxygen vacancies are apparently minority defect species. The onset of oxygen deficiency due to dopant-vacancy associates occurs at x≈0.15 in the AE = Ba and Sr systems but at x≈0.05 in the AE = Ca system. Ideal ionic point defect behavior persists to x≈0.4 in the AE = Ba and Ca systems and to x≈0.5 in the AE = Sr system. A premature flattening of the electrical properties above x≈0.2 occurs in the AE = Ba and Sr systems. Reasons for the extensive range of ideal ionic behavior and for the onset of degenerate electronic behavior are discussed, as are ramifications for high-Tc superconductivity in these materials.

Original languageEnglish
Pages (from-to)81-88
Number of pages8
JournalJournal of the American Ceramic Society
Volume77
Issue number1
Publication statusPublished - Jan 1994

Fingerprint

Point defects
Superconducting materials
Oxygen
Vacancies
Electric properties
Doping (additives)
Oxygen vacancies
Superconductivity
Defects
La2CuO4
Temperature

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Point defect modeling of La2CuO4-based superconductors. / Shen, Li; Salvador, Paul A.; Mason, Thomas O.

In: Journal of the American Ceramic Society, Vol. 77, No. 1, 01.1994, p. 81-88.

Research output: Contribution to journalArticle

@article{a0488438ed5640e892d4f3c6ee650db0,
title = "Point defect modeling of La2CuO4-based superconductors",
abstract = "A point defect modeling study of the oxygen nonstoichiometry and high-temperature electrical properties of La2-xAExCuO4-y (AE = Ba, Sr, and Ca) systems indicates that, whereas oxygen excess (y0) results primarily from dopant-vacancy associates at large x; isolated oxygen vacancies are apparently minority defect species. The onset of oxygen deficiency due to dopant-vacancy associates occurs at x≈0.15 in the AE = Ba and Sr systems but at x≈0.05 in the AE = Ca system. Ideal ionic point defect behavior persists to x≈0.4 in the AE = Ba and Ca systems and to x≈0.5 in the AE = Sr system. A premature flattening of the electrical properties above x≈0.2 occurs in the AE = Ba and Sr systems. Reasons for the extensive range of ideal ionic behavior and for the onset of degenerate electronic behavior are discussed, as are ramifications for high-Tc superconductivity in these materials.",
author = "Li Shen and Salvador, {Paul A.} and Mason, {Thomas O}",
year = "1994",
month = "1",
language = "English",
volume = "77",
pages = "81--88",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "1",

}

TY - JOUR

T1 - Point defect modeling of La2CuO4-based superconductors

AU - Shen, Li

AU - Salvador, Paul A.

AU - Mason, Thomas O

PY - 1994/1

Y1 - 1994/1

N2 - A point defect modeling study of the oxygen nonstoichiometry and high-temperature electrical properties of La2-xAExCuO4-y (AE = Ba, Sr, and Ca) systems indicates that, whereas oxygen excess (y0) results primarily from dopant-vacancy associates at large x; isolated oxygen vacancies are apparently minority defect species. The onset of oxygen deficiency due to dopant-vacancy associates occurs at x≈0.15 in the AE = Ba and Sr systems but at x≈0.05 in the AE = Ca system. Ideal ionic point defect behavior persists to x≈0.4 in the AE = Ba and Ca systems and to x≈0.5 in the AE = Sr system. A premature flattening of the electrical properties above x≈0.2 occurs in the AE = Ba and Sr systems. Reasons for the extensive range of ideal ionic behavior and for the onset of degenerate electronic behavior are discussed, as are ramifications for high-Tc superconductivity in these materials.

AB - A point defect modeling study of the oxygen nonstoichiometry and high-temperature electrical properties of La2-xAExCuO4-y (AE = Ba, Sr, and Ca) systems indicates that, whereas oxygen excess (y0) results primarily from dopant-vacancy associates at large x; isolated oxygen vacancies are apparently minority defect species. The onset of oxygen deficiency due to dopant-vacancy associates occurs at x≈0.15 in the AE = Ba and Sr systems but at x≈0.05 in the AE = Ca system. Ideal ionic point defect behavior persists to x≈0.4 in the AE = Ba and Ca systems and to x≈0.5 in the AE = Sr system. A premature flattening of the electrical properties above x≈0.2 occurs in the AE = Ba and Sr systems. Reasons for the extensive range of ideal ionic behavior and for the onset of degenerate electronic behavior are discussed, as are ramifications for high-Tc superconductivity in these materials.

UR - http://www.scopus.com/inward/record.url?scp=0028367886&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028367886&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0028367886

VL - 77

SP - 81

EP - 88

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 1

ER -