Affordable Access

Publisher Website

The irreversibility line in polycrystalline YBa2Cu3O7superconductors with Y2BaCuO5inclusions

Physica C Superconductivity
Publication Date
DOI: 10.1016/0921-4534(92)90269-i


Abstract We have investigated the irreversibility line for bulk YBa 2Cu 3O 7:Y 2BaCuO 5 composites with varying mass ratios by performing AC susceptibility measurements. The irreversibility line depends on the concentration of the 211 inclusions demonstrating the influence of microstructure and pinning mechanisms. Assuming a general form for the pinning potential U p≈(1- t) α/ H β where t= T irr/ T c, the behaviour can be understood in terms of the giant flux creep model in which the irreversibility line follows a power law 1− t= aH q . Different values of a and q are found for each sample. Another important feature reported here is a change in the values of a and q in moving from a low to a high field region of the Applied AC magnetic field marking a crossover between two regimes. The frequency dependence of the irreversibility temperature T irr is also used to test the validity of flux creep and vortex glass models.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times

More articles like this

Anisotropy of the irreversibility line in MPMG YBa...

on Physica C Superconductivity Jan 01, 1991

The AC magnetic response of YBa2Cu3O7with Y2BaCuO5...

on Physica C Superconductivity Jan 01, 1993

Analytical TEM investigations of YBa2Cu3O7 − xwith...

on Physica C Superconductivity Jan 01, 1995

Restricted reversible region and strongly enhanced...

on Physica C Superconductivity Jan 01, 1991
More articles like this..