Surface Influence on Flux Penetration into HTS Bulks

Details Surface Influence on Flux Penetration into HTS Bulks Surface Influence on Flux Penetration into HTS Bulks

1999-07-04

arxiv.org/abs/cond-mat/9907053v1

Physica B 284-288, 903 (2000)

Physics

Condensed Matter

Superconductivity

2 pages with 1 EPS figure, to be presented at LT22

Scientific paper

10.1016/S0921-4526(99)02219-X

The influence of surface treatment on AC loss in melt-processed quasi-single crystal HTS was investigated with resonance oscillations technique. We have found that amplitude dependencies of AC loss on magnetic field amplitude become rather complicated after surface polishing. The experimental data show well distinguished dynamic crossover from absence of barrier at low rates of field variation to its appearence at higher rates. An explaination of such a dynamic surface barrier appearance based on consideration of along surface vortex propagation was suggested.

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