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.
- AC loss
- Coupling currents
- Multi-filament superconductors
Oomen, M. P., Rieger, J., Leghissa, M., Rabbers, J. J., & ten Haken, B. (2000). The onset of full coupling in multi-filament superconducting tapes exposed on an alternating external magnetic field. Physica C, 340(2-3), 87-92. https://doi.org/10.1016/S0921-4534(00)01338-1