Flux creep through the surface barrier and columnar defects in HTSC

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The rate of flux creep over the surface barrier in clean HTSC samples is found. This rate proves to be significantly different for the cases of vortex entry and escape (relaxation "in" and "out", respectively). Since a flat surface is topologically similar to the artificial columnar defects, their comparison is useful. The vortex creep over the surface is equivalent to that over the cylinder defect of radius r > λ, whereas the radii of real defects obtained so far are of order ξ{A figure is presented} λ. We discuss the effect of the smallness of defect radius on the creep process, which results in very small activation energies U at large critical current Jc. The importance of the increase of the defect radius is predicted.

Original languageEnglish
Pages (from-to)403-412
Number of pages10
JournalPhysica A: Statistical Mechanics and its Applications
Issue number1-4
StatePublished - 15 Nov 1993

Bibliographical note

Funding Information:
The author acknowledgesa fellowship from the Raschi Foundation. This work is partially supported by the German-Israeli Foundation for Scientific Research and Development (G.1.F).


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