Abstract
Irreversible magnetization curves in particular in self field conditions were investigated for specimens of bulk Nb3Sn as an isotropic and non-granular alternative to high T c materials. The specimens were cut into squares with side length to thickness ratios of about 0.8 to almost 20, leading to diamagnetic slopes |χ d | ranging from slightly more than 1 (slab in parallel field) to 13 (plate in perpendicular field). The peak in the low field magnetization (caused by the field dependence of j c ) moves from negative field for specimens with small |χ d | (where it should be according to the standard Bean model) to zero or even positive fields for specimens with large |χ d | . Finite element self consistent calculations with field dependent and thus spacially varying j c were used to fit the measured hysteresis curves. A strong current peak in the center plane of the specimens — caused by the demagnetization field — probably causes the shift of the magnetization peak to positive field. Best agreement between the experimental and calculated magnetizations have been obtained for the extreme geometries: either thin disk in perpendicular (χ d < −4) or thin slab in parallel magnetic field (χ d > −1.2).
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Däumling, M., Goldacker, W. Specimen geometry effects on the irreversible magnetization in the low field regime for specimens of bulk Nb3Sn. Z. Phys. B 102, 331–336 (1997). https://doi.org/10.1007/s002570050296
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DOI: https://doi.org/10.1007/s002570050296