Critical state analysis of orthogonal flux interactions in pinned superconductors

Details Critical state analysis of orthogonal flux interactions in pinned superconductors Critical state analysis of orthogonal flux interactions in pinned superconductors

2007-04-29

arxiv.org/abs/0704.3830v1

Physics

Condensed Matter

Superconductivity

11 figures, submitted

Scientific paper

10.1103/PhysRevB.76.054504

We show that, based on the critical state model for flux-line pinning in hard superconductors, one can assess the magnetic moment relaxation induced by the oscillations of a perpendicular magnetic field. Our theory follows a recent proposal of using phenomenological 2D modeling for the description of crossed field dynamics in high-T$_c$ superconductors [{\tt arXiv:cond-mat/0703330}]. Stationary regimes with either saturation to metastable configurations, or complete decay to the thermodynamic equilibrium are obtained. The transition between both types of response is related to the disappearance of a flux free core within the sample. As a common feature, a step-like dependence in the time relaxation is predicted for both cases. The theory may be applied to long bars of arbitrary and non homogeneous cross section, under in-plane magnetic field processes.

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