Publication

Evidence for enhancement of critical current by intergrain Ag in YBaCuO-Ag ceramics

Davor Pavuna
1989
Journal Articles

Abstract

The authors report the evidence for enhancement of critical current density Jc by ~50%, which occurs when ~10 wt.% Ag is added to Y1Ba2Cu3O7-δ ceramics. The maximal Jc (~700 A/cm2 at T=77 K) appears simultaneously with maximum YBaCuO compactness in the samples. The silver fills the intergranular space (holes) without Cu substitution, and the critical temperature Tc is not reduced from the bulk value (~91 K). Normal-state resistivity of AG-YBaCuO samples is decreased by an order of magnitude, and samples exhibit improved contact resistance and resistance to water. While the critical density is improved by adding ~10 wt.% Ag, it decreases at higher Ag concentrations

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https://infoscience.epfl.ch/entities/publication/fa44e735-e5ab-4bde-98f6-75a193ed4860

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Davor Pavuna
1989
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fa44e735-e5ab-4bde-98f6-75a193ed4860

About this result

Related concepts (29)

Critical point (thermodynamics)

In thermodynamics, a critical point (or critical state) is the end point of a phase equilibrium curve. One example is the liquid–vapor critical point, the end point of the pressure–temperature curve that designates conditions under which a liquid and its vapor can coexist. At higher temperatures, the gas cannot be liquefied by pressure alone. At the critical point, defined by a critical temperature Tc and a critical pressure pc, phase boundaries vanish.

Curie temperature

In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature. The force of magnetism is determined by the magnetic moment, a dipole moment within an atom which originates from the angular momentum and spin of electrons.

High-temperature superconductivity

High-temperature superconductors (abbreviated high-Tc or HTS) are defined as materials with critical temperature (the temperature below which the material behaves as a superconductor) above , the boiling point of liquid nitrogen. They are only "high-temperature" relative to previously known superconductors, which function at even colder temperatures, close to absolute zero. The "high temperatures" are still far below ambient (room temperature), and therefore require cooling.

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Evidence for enhancement of critical current by intergrain Ag in YBaCuO-Ag ceramics

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