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Flux Pinning in Superconductors pp 377–403Cite as

MgB2

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Part of the book series: Springer Series in Solid-State Sciences ((SSSOL,volume 178))

Abstract

Chapter 9 covers the critical current properties of MgB2 that has a critical temperature considerably higher than those of metallic superconductors and is not seriously influenced by weak links and flux creep as in high-temperature superconductors. It is shown that the critical current density strongly depends on the packing factor of the superconductor. This behavior is well described by the percolation theory. The flux pinning by grain boundaries dominates the critical current density at high magnetic fields. The flux pinning strength of grain boundaries in MgB2 is even stronger than that in Nb3Sn at 4.2 K because of the higher thermodynamic critical field. This strength can be enhanced by C-addition to the B sites, and this can be understood in terms of the electron scattering mechanism by the grain boundaries. In high magnetic fields, the packing factor appears again as an important parameter to determine the irreversibility field. It is necessary to enhance the packing factor to improve the critical current density at low and high fields.

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Authors and Affiliations

  1. Department of Computer Science and Electronics, Kyushu Institute of Technology, Iizuka, Fukuoka, Japan

    Teruo Matsushita

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  1. Teruo Matsushita
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Matsushita, T. (2014). MgB2 . In: Flux Pinning in Superconductors. Springer Series in Solid-State Sciences, vol 178. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-45312-0_9

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