Abstract
We report the successful fabrication of single-filament composite MgB 2/stainless-steel ribbons, as an ultrarobust conductor type. The transport critical current of the non-sintered MgB 2/stainless-steel ribbons is remarkably high, as an unexpected result. Transport critical currents I c∼316 A at T=4.2 K and I c∼82 A at T=20 K were observed at self-field for the non-sintered composite MgB 2/stainless-steel ribbons. The I c value of 316 A is the higher than any other value reported so far. In addition, the persistent current density, that was estimated by Bean formula, of the sintered composite MgB 2/stainless-steel ribbons was more than J p∼6×10 5 A/cm 2 at T=5 K with H=0 G, and J p∼1.1×10 5 A/cm 2 at T=30 K with H=0 G.
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