Magnetic shielding in MgB2/Fe superconducting wires
release_d37osjw7brfnnpubvwdbo565iu
by
J. Horvat, S. Soltanian, X.L. Wang, S.X. Dou
2002
Abstract
Transport critical current (Ic) was measured for MgB2/Fe round wires, with
magnetic field oriented perpendicular to the wire and parallel to it.
Measurements were made on a wire with pure MgB2 core and another wire where
MgB2 core was doped with nano-size SiC. This doping strongly improved the
vortex pinning in MgB2. The field dependence of Ic was strongly improved due to
the presence of the iron sheath. At 30K, Ic did not depend on the field for
fields between 0.09 and 0.7T. At lower temperatures, Ic increased with the
field, after initial decrease, resembling a "peak effect". This effect was
extended to higher fields as the temperature went down: at 10K the peak
appeared at 3.5T. This improvement was not due to mere magnetic shielding by
iron, but more likely to an interaction between the iron sheath and
superconductor. Improvement of vortex pinning did not affect the range of
fields within which this effect was observed.
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