The combination of nanocarbon-doped nanosized MgB 2 precursor powder with an inert metallic sheath of appropriate hardness gives the possibility to obtain tapes with significantly improved critical current densities at high magnetic fields. In parallel field, J c -values of 10 4 A cm −2 at 16.4 T (4.2 K) and 5.6 T (20 K) could be measured.
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Häßler et al. (2008) studied this question.
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