"Unusual" critical states in type-II superconductors

Details "Unusual" critical states in type-II superconductors "Unusual" critical states in type-II superconductors

2007-08-10

arxiv.org/abs/0708.1531v1

Physics

Condensed Matter

Superconductivity

15 pages including 11 figures

Scientific paper

10.1103/PhysRevB.76.064526

We give a theoretical description of the general critical states in which the critical currents in type-II superconductors are not perpendicular to the local magnetic induction. Such states frequently occur in real situations, e.g., when the sample shape is not sufficiently symmetric or the direction of the external magnetic field changes in some complex way. Our study is restricted to the states in which flux-line cutting does not occur. The properties of such general critical states can essentially differ from the well-known properties of the usual Bean critical states. To illustrate our approach, we analyze several examples. In particular, we consider the critical states in a slab placed in a uniform perpendicular magnetic field and to which two components of the in-plane magnetic field are then applied successively. We also analyze the critical states in a long thin strip placed in a perpendicular magnetic field which then is tilted towards the axis of the strip.

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