Abstract
Temperature dependent critical current density and flux-creep measurement were carried out in magnetically aligned HgBa2Ca2Cu3Oy . For 20 K<T<60 K, we observed quasi-exponential behavior of the critical current density J c. The normalized relaxation rate S vs T curve has an N-like shape with the minimum around T=15 K and the peak at 50 K. The theoretical U(J) given by the collective flux creep model describes the experimental result well.
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