Flux-cutting and flux-transport effects in type-II superconductor slabs in a parallel rotating magnetic field

Details Flux-cutting and flux-transport effects in type-II superconductor slabs in a parallel rotating magnetic field Flux-cutting and flux-transport effects in type-II superconductor slabs in a parallel rotating magnetic field

2011-05-05

arxiv.org/abs/1105.1133v2

Physics

Condensed Matter

Superconductivity

12 pages, 29 figures

Scientific paper

The magnetic response of irreversible type-II superconductor slabs subjected to in-plane rotating magnetic field is investigated by applying the circular, elliptic, extended-elliptic, and rectangular flux-line-cutting critical-state models. Specifically, the models have been applied to explain experiments on a PbBi rotating disk in a fixed magnetic field ${\bm H}_a$, parallel to the flat surfaces. Here, we have exploited the equivalency of the experimental situation with that of a fixed disk under the action of a parallel magnetic field, rotating in the opposite sense. The effect of both the magnitude $H_a$ of the applied magnetic field and its angle of rotation $\alpha_s $ upon the magnetization of the superconductor sample is analyzed. When $H_a$ is smaller than the penetration field $H_P$, the magnetization components, parallel and perpendicular to ${\bm H_a}$, oscillate with increasing the rotation angle. On the other hand, if the magnitude of the applied field, $H_a$, is larger than $H_P$, both magnetization components become constant functions of $\alpha_s$ at large rotation angles. The evolution of the magnetic induction profiles inside the superconductor is also studied.

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