Physics – Condensed Matter – Superconductivity
Scientific paper
2003-02-13
Supercond. Sci. Technol. 16, 639-644 (2003)
Physics
Condensed Matter
Superconductivity
To be published in Supercond. Sci. Technol. (2003), in press
Scientific paper
10.1088/0953-2048/16/5/317
We have fabricated a series of iron-sheathed superconducting wires prepared by the powder-in-tube technique from (MgB_2)_{1-x}:(Mg+2B)_x initial powder mixtures taken with different proportions, so that x varies from 0 to 1. It turned out that "ex-situ" prepared wire (x = 0) has considerable disadvantages compared to all the other wires in which "in-situ" assisted (0 < x < 1) or pure "in-situ" (x = 1) preparation was used due to weaker inter-grain connectivity. As a result, higher critical current densities J_c were measured over the entire range of applied magnetic fields B_a for all the samples with x > 0. Pinning of vortices in MgB_2 wires is shown to be due to grain boundaries. J_c(B_a) behavior is governed by an interplay between the transparency of grain boundaries and the amount of "pinning" grain boundaries. Differences between thermo-magnetic flux-jump instabilities in the samples and a possible threat to practical applications are also discussed.
Dou Shixue
Liu Huakun
Pan Alexey V.
Zhou Sihai
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