A heuristic description of AC losses in superconducting slab with smooth voltage-current characteristics represented by power law

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This paper describes the theoretical evaluation of AC losses in the oxide superconductors with smooth transport properties. First, conventional expressions of AC losses are reviewed for the n-value model, in which the local electric field is proportional to the power of local current density. The superconductor under consideration is a slab with infinitely wide faces, to which an external AC magnetic field is applied along the surfaces. It is also assumed that the critical current density and n-value are independent of the magnitude of local magnetic field. As a result of theoretical consideration by combining Maxwell's equations and the n-value model for the voltage-current characteristics, it is pointed out that the loss factor can be determined by only two parameters. Next, a new type of expressions is proposed for the AC loss evaluation, and it is concluded that a discrepancy is less than 17% between analytical and numerical results.

Original languageEnglish
Pages (from-to)1097-1101
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Issue numberPART 2
Publication statusPublished - Oct 1 2002


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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