Abstract
We have succeeded in the fabrication of high–Jc MgB2 wires applying hot isostatic pressure process through a reduction of the wire diameter. The results show that annealing at 570°C in pressure of 1.1GPa allows for high critical current density in undoped MgB2 wires e.g. at 4.2K-1000A/mm2 in 8.1T, 100A/mm2 in 13T and at 20K–100A/mm2 in 5.2T. The reduction of the MgB2 wire diameter induces the number of connections between the grains retaining the circular shape of the wires and increasing the density of pinning centers active at 20K.
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