1303.2296 (Rongchao Ma)

Flux exchange in inhomogeneous type-II superconductors    [PDF]

Rongchao Ma

The vortex hopping motion in a type-II superconductor determines the current-carrying ability and consequently the application fields of the superconductor. However, it is not clear how the vortices hop between the different pinning regions in the superconductor. Here we proposed that there should be magnetic \textit{flux exchange} between two contacting pinning regions. A system of differential equations was constructed to described the flux exchange phenomenon. The numerical solutions and approximate solutions of the system were obtained. The results shows that the flux exchange reduces the internal field in the weak pinning regions, but increases the internal field in the strong pinning regions. Moreover, the flux exchange phenomenon is strongly influenced by the superconductor's geometrical size.

View original: http://arxiv.org/abs/1303.2296