Nonlinear Response of High- Tc Superconductors with Small Current Density

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By using the Anderson pinning model and considering the reversal transition probability of the magnetic flux bundle, we use the consistent theory to derive the three relaxation phenomena with small current density consisting of the relaxation of the fixed external field, the scanning rate H˙ of the external field, and the ac response with driving frequency ν of the external field, respectively. We also explain the corresponding physical phenomena.

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