Abstract
We have studied the vortex dynamics of High-Temperature Superconductors (HTS) in pulsed magnetic fields up to 50 T. Due to the very high sweep rates involved ( μ 0d H a/d t≈10 4 T/s), the induced current density j approaches the non-relaxed critical current density j c0. Turning the sweep rate during a high-field pulse makes it possible to vary the voltage criterion at which j is determined. Furthermore, the use of pulsed magnetic fields substantially increases the experimentally accessible region in the H– T phase diagram.
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