The motion of flux lines in type II superconductors

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Abstract
The motion of a flux line in a clean superconductor of extreme type II (λ≫ζ) at zero temperature is discussed in detail. It is shown that the vortex core is subject to a Magnus force identical to that found in liquid helium. The Magnus force balances the friction force exerted by the lattice on the core. The nature of this friction force is discussed, particularly in the light of a recent paper by Bardeen and Stephen. Different possible forms of the force are discussed and compared with experiment.