Surface Influence on Flux Penetration into HTS Bulks
A. A. Kordyuk, G. Krabbes, V. V. Nemoshkalenko, R. V. Viznichenko
Abstract
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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