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The irreversibility line in polycrystalline YBa2Cu3O7superconductors with Y2BaCuO5inclusions

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
198
Identifiers
DOI: 10.1016/0921-4534(92)90269-i

Abstract

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.

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