The onset of full coupling in multi-filament superconducting tapes exposed on an alternating external magnetic field

M.P. Oomen, J. Rieger, M. Leghissa, J.J. Rabbers, Bernard ten Haken

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At high amplitudes and frequencies of the external magnetic field, the superconducting filaments in a composite conductor are fully coupled. This causes a high magnetisation loss. Methods to decouple the filaments are well known for the low-Tc superconductors and have recently been applied also to high-Tc composites. In this paper, expressions are derived for the magnetic-field amplitude and frequency where full coupling sets in, as well as for the twist length required for decoupling the filaments in a general rectangular composite. A comparison is made with other expressions found in the literature. The filaments in a typical Bi-2223/Ag tape in parallel magnetic fields are decoupled just by twisting. In perpendicular fields a high transverse resistivity is required to decouple the filaments and decrease the magnetisation loss.
Original languageUndefined
Pages (from-to)87-92
Number of pages6
JournalPhysica C
Issue number2-3
Publication statusPublished - 2000


  • Bi-2223
  • AC loss
  • METIS-128722
  • Coupling currents
  • IR-74229
  • Multi-filament superconductors

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