Abstract
A single phase HgBa 2Ca 2Cu 3O 8+ δ superconductor, having a T c of 133 K, was successfully synthesized. Electrical resistivity and critical current density measurements were performed. With the experiments of flux motion, it became clear that there is actually a more subtle shape to the I– V curve, or the ρ– T curve: separate regions of flux creep and flux flow can be identified according to the two universal curves, indicating a vortex-glass transition. This paper reports the ρ– T curves collapse on to the positive curvature line, associating with flux flow. The phase diagram in H– T space for the vortex-lattice can also show a vortex-glass–liquid transition at temperature T g.
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