Abstract
By analyzing the flux-line dynamics and the critical current density as a function of temperature and magnetic field in Tl 2Ba 2Ca 2Cu 3O 10 single crystals, we have identified different pinning regimes. We have shown that the brea in slope in the j c vs. T curve at T=T CR may be caused by the crossover from the strongly dispersive small-bundle to the weakly dispersive large-bundle collective pinning.
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