High-temperature superconductivity in a Y-Ba-Cu-based system without extraneous oxygen

The preparation of a high-temperature superconductor based on the Y-Ba-Cu-based system without the use of any extraneous oxygen is reported. Using starting materials with a maximum possible oxygen content of 3.5 oxygen atoms per formula unit of the end product and ambient nitrogen during synthesis,...

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1991-06, Vol.43 (16B), p.13622-13625
Main Authors: KHAN, N. A, IQBAL, M. Z, AFZAL, S, QURASHI, U. S
Format: Article
Language:English
Subjects:
360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER COMPOUNDS
COPPER OXIDES
ELEMENTS
Exact sciences and technology
FABRICATION
HIGH-TC SUPERCONDUCTORS
MATERIALS SCIENCE
NITROGEN
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
Physics
Properties of type I and type II superconductors
QUANTITY RATIO
Superconductivity
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Summary:The preparation of a high-temperature superconductor based on the Y-Ba-Cu-based system without the use of any extraneous oxygen is reported. Using starting materials with a maximum possible oxygen content of 3.5 oxygen atoms per formula unit of the end product and ambient nitrogen during synthesis, we observe {similar to}90-K superconductivity. This challenges the traditional understanding of the essential link between oxygen and superconductivity in these materials.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.43.13622