Abstract
We present an analytically exactly solvable model, based on thermally activated flux-creep, for magnetic relaxation in high- T c superconductors. The model involves a single potential barrier which separates two pinning regions. The analytical expression derived for the magnetization M( t) gives a good description of experimental relaxation data. It also reproduces the results of Monte Carlo simulations obtained for many pinning regions. Furthermore, the two-pinning region model leads to a natural explanation of the ohmic behaviour of I–V-characteristics measured near T c in strong magnetic fields.
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