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Article
Sample-size dependence of the magnetic critical current density in MgB2 superconductors
Faculty of Engineering - Papers (Archive)
  • M. J. Qin, University of Wollongong
  • S. Keshavarzi, University of Wollongong
  • Saeid Soltanian, University of Wollongong
  • Xiaolin Wang, University of Wollongong
  • Hua-Kun Liu, University of Wollongong
  • S. X. Dou, University of Wollongong
RIS ID
11329
Publication Date
1-1-2004
Publication Details

This article was originally published as: Qin, MJ, Keshavarzi, S, Soltanian, S, Wang, XL, Liu, HK & Dou, SX, Sample-size dependence of the magnetic critical current density in MgB2 superconductors, Physical Review B, 2004, 69, 012507. Copyright 2004 American Physical Society. The original journal can be found here.

Abstract

Sample size dependent magnetic critical current density has been observed in magnesium diboride superconductors. At high fields, larger samples provide higher critical current densities, while at low fields, larger samples give rise to lower critical current densities. The explanation for this surprising result is proposed in this study based on the electric field generated in the superconductors. The dependence of the current density on the sample size has been derived as a power law j}R1/n @n is the n factor characterizing E2j curve E 5Ec( j/ jc)n]. This dependence provides one with a method to derive the n factor and can also be used to determine the dependence of the activation energy on the current density.

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Citation Information
M. J. Qin, S. Keshavarzi, Saeid Soltanian, Xiaolin Wang, et al.. "Sample-size dependence of the magnetic critical current density in MgB2 superconductors" (2004)
Available at: http://works.bepress.com/hkliu/59/