We study the creep problem in type-II superconducting materials for which the characteristic pinning center dimension I is larger than the coherence length xi. The average value of the escape time of flux quanta from these pinning centers is calculated by adopting an appropriate expression for the pinning potential U. The attempt frequency v in the Arrhenius formula is seen to depend explicitly on the current density J and the electric field E-creep due to flux-creep, calculated by this approach, qualitatively agrees with the experimental E - J curves.
A modified flux-creep picture
DE LUCA, Roberto;PACE, Sandro;POLICHETTI, Massimiliano
1997-01-01
Abstract
We study the creep problem in type-II superconducting materials for which the characteristic pinning center dimension I is larger than the coherence length xi. The average value of the escape time of flux quanta from these pinning centers is calculated by adopting an appropriate expression for the pinning potential U. The attempt frequency v in the Arrhenius formula is seen to depend explicitly on the current density J and the electric field E-creep due to flux-creep, calculated by this approach, qualitatively agrees with the experimental E - J curves.File in questo prodotto:
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