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Using an electrochemical bath, copper and nickel metals and alloys are removed in multifilamentary MgB2 conductors to leave single MgB2 filaments surrounded by an Nb sheath. Starting from a 0.55-mm 36-filament-diameter conductor, the etched filaments are 60 µm in diameter. Seven wires were characterized by transport critical current measurement, and one investigated further by resistivity when progressively...
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