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Magnetic flux bifurcation and frequency doubling in rotated superconductors

Journal of Applied Physics, ISSN: 0021-8979, Vol: 92, Issue: 10, Page: 6110-6118
2002
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Article Description

Starting from our variational statement of the general critical state in type II superconductors, we develop anisotropic current flow simulations in various conditions. The theory is applied to the slab geometry under rotating applied field, parallel to the surface of the sample. By comparison to the isotropic case, we show that anisotropy strongly influences the underlying physical phenomena. A magnetic-flux bifurcation point arises for the isotropic hypothesis. The issue of this point defines a boundary between two groups of vortex lines, one of which rigidly settles within the sample and another one, which frictionally rotates relative to the sample. A much more complex scenario arises in the anisotropic case, for which dynamic fronts must be defined. As a consequence, we predict the appearance of nonlinear phenomena such as the magnetization frequency doubling. The anharmonic contribution may be tuned by the applied field modulus. © 2002 American Institute of Physics. © 2002 American Institute of Physics.

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